Sr Research Experiment Builder

Sr Research Experiment Builder The SR Research Experiment Builder SREB is a visual experiment creation tool for use by Psychologists and Neuroscientists. The SREB is designed to be easy to use while maintaining a high degree of flexibility. This unique design combination allows for a wide range of experimental paradigms to be created by someone with little or no programming or scripting expertise. When used in combination with the SR Research EyeLink ® eye tracking system, the SREB provides seamless integration into the EyeLink hardware and software platform. Experiments are created in the Experiment Builder by dragging and dropping experiment components into a workspace and configuring the properties of the added components. There are two main classes of experiment components in the Experiment Builder: Actions and Triggers. Actions tell the computer to do something, like displaying a set of graphics on the screen or playing a sound. Triggers define the conditions that must be met before an action can be performed. The flow of the experiment is achieved by connecting sequentially related components in the workspace in a flow diagram like fashion. One of the important concepts in SR Research Experiment Builder is hierarchical organization of events in an experiment. A typical experiment can be dissected into several levels along a hierarchy of Experiment à ¢Ã¢â‚¬  Ã¢â‚¬â„¢ Blocks à ¢Ã¢â‚¬  Ã¢â‚¬â„¢ Trials à ¢Ã¢â‚¬  Ã¢â‚¬â„¢ Trial Runtime / Recording. All of the events within each level of this hierarchy can be conveniently wrapped in a loop (called sequence or sub-graph in Experiment Builder). This allows the whole sequence to be connected to other objects as a unit and be repeated several times in a row. Creating EyeLink Experiments To create an Experiment with SR Research Experiment Builder, the user needs to take the following the following steps: Experiment Design Building and Test-running Experiment Deploying Experiment Participant Data Set Randomization Data Collection Data Analysis Following these, a set of files are generated so that the experiment can be run for data collection without relying on the Experiment Builder application. To illustrate the use of Experiment Builder, a very simple eye-tracking experiment can be shown which runs three blocks of four trials. In each trial, a single word is displayed in the centre of the screen. Creating a New Experiment Session Click on the Experiment Builder to start a new session. When the application starts: Click on File à ¯Ã¢â€š ¬Ã‚ ­Ãƒ ¯Ã¢â€š ¬Ã‚ ¾ New on the application menu bar. In the following New Project dialog box, enter Simple in the Project Name edit box. Click on the button on the right end of the Project Location to browse to the directory where the experiment project should be saved. If you are manually entering the Project Location field, please make sure that the intended directory already exists. Make sure that EyeLink Experiment box is checked for an EyeLink experiment. Note: The user shouldnt manually add or remove files in the experiment directory. Configuring Experiment Preference Settings After a new experiment session is created, the user needs to check whether the default display and screen preference settings are fine for the experiment to be created. Select Edit à ¯Ã¢â€š ¬Ã‚ ­Ãƒ ¯Ã¢â€š ¬Ã‚ ¾ Preferences from the application menu bar or press the F4 key. Click on Preferences à ¯Ã¢â€š ¬Ã‚ ­Ãƒ ¯Ã¢â€š ¬Ã‚ ¾ Experiment à ¯Ã¢â€š ¬Ã‚ ­Ãƒ ¯Ã¢â€š ¬Ã‚ ¾ Devices à ¯Ã¢â€š ¬Ã‚ ­Ãƒ ¯Ã¢â€š ¬Ã‚ ¾ Display to check display settings. Make sure that the settings (Width, Height, Bits per Pixel, and Refresh Rate) used are supported by your video card and monitor. Click on Preferences à ¯Ã¢â€š ¬Ã‚ ­Ãƒ ¯Ã¢â€š ¬Ã‚ ¾ Screen to check Screen Builder settings. Set the Location Type as Center Position. If any of the above settings have been changed and if you want to keep the new settings as defaults for all of your future experiments, click on the button save properties as default. Creating Experiment Block Sequence The first step is to add a block sequence for repeating blocks: Click on the Experiment Tab in the Project Explorer Window to start. Click on the Action Tab of component toolbox. Select the Sequence node, hold down the left mouse button and drag it into the work area. Place the mouse cursor on top of the START node; hold down the left mouse button while moving the mouse cursor on top of the SEQUENCE node. This makes the connection from the START node to SEQUENCE node. (Note: dont make a single or double click on the START node as this will select the node instead. If you have done so, place the mouse cursor on a blank area in the work space and make a single click there. Redo the current step again.) Click on any blank area in the work window. Click the right mouse button and select Arrange Layout in the popup menu. This will re-arrange the nodes in a hierarchical fashion. Click on the SEQUENCE node in the structure list to continue. Editing Block Sequence Next, one will need to edit the properties of the Block Sequence. This involves changing the Label of the sequence to make it more meaningful and changing the iteration count (total number of times a sequence must be executed) to the actual number of blocks to be tested. Click on the value field of the Label property of the Sequence created. Write BLOCK in the text editor and press the ENTER key to finish. Click on the Iteration Count value field and enter 3 as the total number of sequence loops. In the experiment Work Space, double click on the Sequence object to continue. In each block, one has to first give an instruction, perform a camera setup, calibration, and then run the trials (an example has been given below) Click on the Action Tab of the component toolbox, select the Display screen action, hold down the left mouse button and drag the action into the work area. Click on the Trigger Tab of the component toolbox, select the Keyboard trigger, hold down the left mouse button and drag the action into the work area. Add an EyeLink © Button trigger to the work space. Add a Timer trigger to the work space. Click on the Timer trigger and set the duration to 20000 msec. Click on the Action Tab of the component toolbox and add a Camera Setup action to the work space. Click on the action and set the Background Color to white (255, 255, 255). Click on the Action Tab of toolbox and add a Sequence node to the work space. This will be our trial sequence. Place the mouse cursor on top of the START node. Hold down the left mouse button while moving the mouse on top of the DISPLAY_SCREEN node. This makes the connection from the start node to the DISPLAY_SCREEN node. Similarly, connect from DISPLAY_SCREEN to KEYBOARD, EL_BUTTON, TIMER triggers. Note that a number is added to these connections, indicating the evaluation order among the three trigger types. Make the connection from the latter three triggers to the EL_CAMERA_SETUP node and from EL_CAMERA_SETUP to the SEQUENCE node. Click at any blank area in the work window. Click the right mouse button and select Arrange Layout in the popup menu. This will re-arrange the nodes in an orderly fashion. Double click on the DISPLAY_SCREEN object in the work space (not from the structure list) until the Screen Builder interfaces displayed in the Graph Editor Window. Creating Instruction Screen The user may want to provide instruction to the participants at the beginning of the experiment. This can be done by creating an image file containing the experiment instructions and then using DISPLAY_SCREEN action to show the image. The instruction text can also be created with the multiline text resource. In the current example, multiline text resource text source is used. Click on the multiline text resource button on the screen builder toolbar to select the type of resource to be added. Click anywhere on the screen. In the following Multiline Text Resource Editor: Enter the instruction text. Press CTRL + A to select all text entered. Click the Margins button box to set the text margins. Enter 100 (or desired value) in all fields. Click the OK button on the dialog box. Make sure that the text is still selected. Now click the buttons on the toolbar to set the desired text appearance (font name, font size, font style, alignment style, line spacing, and text colour). Click on the Close button at the top right corner of the dialog to finish. To work with images instead of texts: The image resource is flexible enough to accommodate various modes of displaying (e.g., original image size vs. stretched, top-left aligned or centred). The following discusses the option of displaying images in original size or stretching it to a specific dimension. To display the image in original size, after the image is added to the display, the user should have Use Original Size field of the image checked. Please note that, enabling that field will also make several attributes read-only (Width, Height, Clipping Location, Clipping Width, Clipping Height, and Clipping Area is Gaze Contingent). To stretch all images to a fixed width and height (1024 ÃÆ'- 768 for example), after the image is added to the display, the user should first make sure that the Use Original Size field is unchecked. Check the values of Width and Height fields of sample image added and adjust them if necessary. In addition, the user may need to check the values of Clipping Location, Clipping Width and Clipping Height attributes, which are used to control the part of the image to be shown. By default, the clipping width and height are the same as the image width and height. Please note that the clipping location is always top-left based and the location is relative to the top-left corner of the image. If images are stretched to different dimensions, the user should add two columns in the experiment data source to specify the desired image width and height. After the sample image is added to the display, the user should refer the width, height, clip width, and clip height of the image to the two columns created in the data source. Editing Trial Sequence: Data Source Next, one will have to work on the sequence, which will contain all necessary triggers and actions in each trial. One would also have to create a data source to be used for setting parameters in individual trials. Click on the last SEQUENCE node on the structure list to start. In the property table, click on the value field of LABEL. Set it to TRIAL. Click on the Data Source property to bring up Data Source Editor. Click on the Add Column button. In the following dialog box, type Trial (without quotation marks) in the Column Name editor box and set Column type as Number. Click OK button to finish. Click on the Add Column button again. Set the Column Name as Word and Column type as String. Click OK button to finish. Click on the Add Row button. Enter the desired number (here 12) in the Number of Rows edit box to generate the number of rows of empty cells (here 12). Click on the empty cells of the table just generated. For this example, the values of the Trial column are set as 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12. For the word column, the following strings have been used: One, Two, Three, Four, till Twelve. Click on the Split by value field. Enter a value (here [4]. This makes sure that only 4 trials are run in each block.) Double click on the TRIAL sequence node in the structure list. Click on Start node under it to continue. Editing Trial Sequence: Preparing Sequence and Drift Correction Each recording trial should begin with a prepare sequence action, followed by a drift correction action, and then by the actual trial recording. The prepare sequence action allows the user to preload the image files or audio clips for real-time image drawing or sound playing, to draw feedback graphics on the Host PC to evaluate participants performance, and to reinitialize trigger settings. The user should typically call this action before performing a drift correction. Click on the Action Tab of the component toolbox, select the Prepare Sequence action, hold down the left mouse button and drag the action into the work space. Click on the added PREPARE SEQUENCE action and review the settings in the property table. Make sure to check Draw To EyeLink Host field is set to IMAGE or PRIMITIVE. This will draw image or simple graphics on the host screen for the purpose of evaluating gaze accuracy. Add a Drift Correction action from the action tab of the component toolbox. Click on the Action Tab of toolbox, select the Sequence node, hold down the left mouse button and drag it into the work space. Make a connection from the START node to PREPARE_SEQUENCE, from PREPARE_SEQUENCE to DRIFT_CORRECTION, and from DRIFT_CORRECT to the SEQUENCE node. Click on any blank area in the Work Space. Click the right mouse button and select Arrange Layout in the popup menu to re-arrange the nodes in an orderly fashion. Double click on the newly created sequence to fill in the actual events in the recording. Editing Recording Sequence In a simple recording sequence, one has to display a screen and then wait for a button press response from the participant. The trial times out automatically if no response is made within a user specified time interval in seconds. The display screen is then cleared. Select the newly added Sequence node. Rename the label as RECORDING. Make sure that the Record and Is Real time checkboxes are checked. Double click on the RECORDING node in the structure list until seeing a START node under it. As we double click on the START node, the content of the work area window is also updated. Click on the Action Tab of the component toolbox, select the display screen action, hold down the left mouse button and drag the action into the work area. Click on the Triggers Tab of toolbox, select the TIMER node, hold down the left mouse button and drag the trigger into the work space. Double click on the Timer object. Enter Time out (without quote) in the Message value field and 10000 (time in ms) in the duration field. Add an EyeLink © Button trigger. Add another display screen action. Double click on the action and modify its label as DISPLAY_BLANK. Also uncheck the Send EyeLink DV Message box. Make a connection from the START node to DISPLAY_SCREEN, from DISPLAY_SCREEN to TIMER, from DISPLAY_SCREEN to EL_BUTTON, from TIMER to DISPLAY_BLANK and from EL_BUTTON to DISPLAY_BLANK. Click at any blank area in the work space, then click the right mouse button and select Layout à ¢Ã¢â€š ¬Ã‚ ¦ in the popup menu. Click ok in the following dialog box. This will re-arrange the nodes in an orderly fashion. Modifying Properties of Display Screen One must first need to check the property settings of the display screen actions. For better Data Viewer integration and for reaction time calculation, a message should be written to the EDF file to indicate the time when the stimulus was visible to the participants. In addition, one may need to draw simple graphics onto the host screen so that the participants gaze accuracy during recording can be evaluated. Click on the DISPLAY_SCREEN node. In the property window of the action, double click on the value field of Message property. Type in SYNCTIME and then press ENTER key to register the change. Make sure that the Send EyeLink © DV Messages and Use for Host Display properties are checked. Select the DISPLAY_BLANK action. Double click on the value field of Message property. Type in blank_screen and then press ENTER key to register the change. Make sure that both Send EyeLink © DV Messages and Use for Host Display checkboxes for the DISPLAY_BLANK action is unchecked. Creating Display Screen In here, one has to add a text resource to the display screen and modify the properties of the text resource, such as font name, size, text to be displayed, and alignment style. One also must have to create an interest area for the text. To do this, first double click on the DISPLAY_SCREEN object in the work space, until the screen builder interface is displayed in the Graph Editor Window. Click on the Insert Text Resource button on the Screen Builder tool bar, and click at any position in the work area. Double click on the current value of Font Name (New Times Roman). This will bring up a dropdown list. Set the new font name as Arial (or any other). Double click on the current value of Font Size (20). Enter the desired text size (40) in the text editor. Double click on the far right end of the value field of the Text property. This will bring up an attribute editor dialog. Click on DataSource node under TRIAL sequence on the node selection list. Double click on the word node in the node attributes window. This will update the contents of Attribute editor dialog as @[emailprotected]. Click on the OK button to finish. Check the Use Runtime Word Segment box. This will create interest area automatically for the text used. Select the newly added text resource, click on both Horizontal Center Alignment and Vertical Center Alignment buttons to place the text in the center of the screen. Select the text resource on the work area, click the right mouse button, and select the Lock Selection option so that the resource will not be moved accidentally. Writing Trial ID to EDF file A TRIALID message should be written to the EDF file so that the actual experiment condition under which the trial was conducted can be identified during analysis. Click on the Experiment (the topmost) node in the structure list to start. In the property table, click on the value field of the EyeLink © DV Variables property. In the following dialog box, for each of the variables to be added to the trial ID message, select the variable and click the ADD button. The order of the selected variables can be modified with the Move up and Move down buttons. Click on OK to finish. Showing Experiment Progress Message on Tracker Screen During trial recording, a text message can be displayed at the bottom of the tracker screen so that the experimenter can be informed of the experiment progress. For example, in this experiment, a text message like Trial 1/12 One on the tracker screen was shown. Click on the Recording sequence node in the structure list to start. In the property panel, click on the far right end of the value field of the EyeLink © Record Status Message property. In the attribute editor, enter an equation as: =Trial + str(@[emailprotected]) + /12 +str(@[emailprotected]) Click on the OK button to finish. Building the Experiment Click on Experiment à ¯Ã¢â€š ¬Ã‚ ­Ãƒ ¯Ã¢â€š ¬Ã‚ ¾ Build menu to build the experiment. The Editor Selection Tab in the Graph Editor Window will be set to the Output tab and build information will be displayed. Watch out for error (displayed in red) and warning (in brown) messages during building. The following is a list of common errors during experiment building: Image file not found No positions are added to the custom pattern Use of runtime value with pre-build to image option on No value is set at row for the column The node could not be used in the sequence Reference to not found in the graph. No link from node. Infinite loop found Invalid Reference. No recording sequence found in an EyeLink © experiment. The following is a list of common warnings during experiment building: The keyboard trigger and mouse trigger is used in a real-time sequence. If this is the case, check whether these two triggers are indispensable for the experiment design. If so, uncheck the Is Real-time box in the recording sequence. Default value use in attribute The user may also test the experiment by clicking on Experiment à ¯Ã¢â€š ¬Ã‚ ­Ãƒ ¯Ã¢â€š ¬Ã‚ ¾ Run from the application menu-bar. This will try to connect to the tracker PC and execute the experiment code. It should be noted that this should only be used for the purpose of testing and debugging experiment code. To collect experiment data, the user should use the deployed version of the experiment as it does not have to rely on the Experiment Builder application and can be run on a different computer. Deploying the Experiment After the experiment is built, the user must deploy the experiment to a new. This will generate a set of files so that the experiment can be run on a different computer without relying on the Experiment Builder application. If a data source is used, this will create a datasets subdirectory with a copy of data set file in it. The user can create several copies of data set files with the randomizer application Running the Experiment To run the experiment, open the directory where the experiment is deployed to and click on .exe. If the EyeLink © host application is already running on the Host PC and the Ethernet connection and settings between the host and Display PCs are ok, the experiment should now start. This will first popup a dialog box asking for the data source file. Go to the datasets directory and select the target data source file. Following this, enter the desired EDF file name (must be in DOS 8.3 format) and click on the OK button to continue. Following the initial welcome message, the participant will be shown the camera setup and calibration screen and the recording can be started following calibration, validation, and drift correction. After the experiment has ended; an EDF file will be transferred to the Display PC. It may take some time to complete the file transfer. Possible Errors Error in Initializing Graphics: When you start the experiment and see an Error Initializing Graphics error, please check whether the display settings (screen resolution, colour bits, and refresh rate) specified for the experiment are supported by your video card. If not, please change the Preferences à ¢Ã¢â‚¬  Ã¢â‚¬â„¢ Experiment à ¢Ã¢â‚¬  Ã¢â‚¬â„¢ Devices à ¢Ã¢â‚¬  Ã¢â‚¬â„¢ Display settings. Error in Tracker Version: SR Research Experiment Builder works well with both EyeLink and EyeLink II eye trackers. The default tracker version is set to EyeLink II (see Preferences à ¢Ã¢â‚¬  Ã¢â‚¬â„¢ Experiment à ¢Ã¢â‚¬  Ã¢â‚¬â„¢ Devices à ¢Ã¢â‚¬  Ã¢â‚¬â„¢ EyeLink). Therefore, EyeLink I users may see such an error message with the default tracker setting. If this is the case, please set the tracker-version in the device settings to EyeLink I. Participant Data Set Randomization In most experiments, the user will need to randomize trial order so that the experiment materials are not presented in the same sequence across participants. Randomization of data source can be done with either an internal randomizer or an external randomizer. These two randomization methods are almost identical and therefore the user may use the internal randomizer to perform randomization unless counterbalancing or Latin-square designs are needed. The configuration of the internal randomization settings should be done before deploying the experiment project whereas the external randomization can be done after deploying the experiment project. Data Collection Data can now be collected from the deployed version of the experiment. Double click on the executable file in the deployed experiment directory or type in the .exe file name from the command-line prompt. If the experiment uses a data source, a dialog will be displayed, allowing the user to choose the appropriate data source file. In an EyeLink © Experiment, the user will also be asked to enter the experiment session name. At the End of experiment, an EDF file will be generated for EyeLink © recording session and saved in the experiment directory. Optional result file(s) will be created if the user has specified them in EyeLink © and non-EyeLink © experiments. Data Analysis EyeLink © recording file can be conveniently analyzed with EyeLink © Data Viewer as the experiments created with Experiment Builder are fully integrated with this analysis tool. Experiment Builder sends messages to the data file so that images or simple drawing can be added as overlay background. The user can also specify trial variables, create interest areas, and send messages for the ease of data analysis. The result file(s) from a non-EyeLink © recording session contains columnar outputs for selected variables in the experiment. This file can be easily loaded by common statistics packages. Lists of Application Menu Bar and Toolbar File Menu and Tool Buttons Edit Menu and Tool Buttons Experiment Menu and Tool Buttons Help Menu Lists of Actions, Triggers and Other Node Types Actions Triggers Other Node Types

Past Way Of Life Essay

Life in the past was characterized with lots of battles between rival territories. This resulted to the rise of powerful empires and the measure of power during those days was through the number of wars fought. Warriors of those days were called Vikings. Erik the red is one of the renowned warriors of those days. He was born in Norway and participated in wars for his mother country. A Viking also denotes a pirate, merchant or explorer. These Norsemen normally used long ships to travel in the sea to all the places of their interest and used the same vessels to fight their enemies. The Vikings are traced to have originated in the early 17th century in the German territory. The initiator of Vikings in the Iceland is Erik the red. He lived all his life ruling his people after which his son picked the mantle from him (Gwyn, J. 2000). Erik the red left a legacy during his time because he is known as the founder of the Greenland territory. He was an explorer for a long time and moved with his people to many places in the sea. After having been exiled for three years from his native home in the Iceland, Erik decided to explore the neighboring regions in the sea and finally came across the green land. His sets of Vikings were mainly explorers but they had to fight some ballets whenever they met opposition. The team led by Erik sailed further to the north Atlantic territories and finally to North America. Their main activities were looting, exploration, colonization and living a mercenary’s kind of life. The Vikings had very strict leadership and way of life. In the beginning, Erik was the leader and at some point he was referred as the chief of the land. This was mainly in green land. He actually used his cunning nature to name the land. The word green was a very strategic name so that he could attract more people into his territory. These people were mainly farmers who planted yams and corn. Under the ruler ship of Erik, the Vikings could sometimes go for attacking expeditions in the sea and they as a result came back with commodities like ivory from tucks and even sea whales. More people later got attracted into the Greenland and they formed a territory in this island. Their population however increased that they sometimes lacked food and other commodities. CHANGES THAT HAVE OCCURRED Erik the red later died and left his ruler ship to his son Seif. They later discovered that attacking were more risky and less profitable. The incoming of Christianity further played a big part in eliminating the Vikings kind of life and they later adopted romanticism culture. The Nazi people are also a fruit of the cultural setting of the Vikings. This started in the 18th century when a myth was created to enable Sweden take up Finland to their side. This came at a time when Finland had been lost between Sweden and Russia (Tomasi, M 1999). Various authors have produced publications on the subject of Vikings and this was done with intent to revive the Nordic culture in the Iceland. Many territories in the region today have taken up after the Erik the red’s kind of ruler ship. Norwegians for example have a lot of symbolism to the Viking governance. An example of this is the Norwegian fascist party. This shows that Vikings policies are still operational in the political arena of the world today. The German people are also in the same train of following closely to the Viking culture. This they do even though they claim that they have no links to the Viking settlers. THE PRESENT SETTINGS AND COMPARISON TO THE PAST The ancient Vikings culture has been written in many books today. These trace all the happenings and activities of the people. The Vikings culture has been embraced by many people in this current generation. Norway and Germany are among the countries that practice various aspects of this culture. The Norway for example embraces its political arena organized in a Viking setting. Many political leaders have also taken the way of the Vikings ruler ship and with time are applying the skills in addressing various issues. Vikings always participated in wars in order to obtain food and other supplies for their territories. They did this through sea looting and piracy. These were accepted ways of life during those days but are not accepted in the day today. References Tomasi, M (1999). World history. Oxford: Oxford publishers. Gwyn, J. (2000). A history of Vikings. Oxford: Oxford publishers

Investigate the Effect of Caffeine on the Heart Rate of Daphnia

Aim: In this experiment we are trying to find out how varying the concentration of caffeine can affect the heart rate of Daphnia shrimp.Prediction: I predict that caffeine will increase the heart rate of the shrimp.IntroductionI believe the results will comply with my prediction. Caffeine is a compound found in especially tea and coffee plants and acts as a natural pesticide.Caffeine is a central nervous system stimulant meaning it increases the amount of neurotransmitters released meaning coffee is a stimulant that affects the central nervous system by increasing its activity. In this practical the caffeine should have a noticeable effect on the heart rate of Daphnia as Daphnia absorbs chemicals present in the solution around it without selection. I also predict that there would be an increase in heart rate once placed in decaffeinated coffee as decaffeinated coffee still has caffeine content but significantly lower per milligram than caffeinated coffee.However I will expect the inc rease of heart rate of the culture placed in caffeinated coffee to be significantly higher than the culture placed in decaffeinated coffee. Daphnia: The reason Daphnia is used as the organism in this experiment is due to its transparent body which makes the heart visible. Daphnia is better than Brine shrimp because brine shrimp is not transparent meaning heart rate has to be measured by counting leg movement. Variables: The independent variable that we change. In this case it is the caffeine content.We would be experimenting with water, decaffeinated coffee and caffeinated coffee to observe and compare its effect on the heart rate of Daphnia. The control for this experiment is a solution with no caffeine which allows us to see if the change in heart rate is due to the caffeine or other factors. To ensure that this experiment is a fair test only the concentration of the caffeine will be changed. Caffeine is the independent variable. I tested each particular concentration of caffeine 10 times.I decided this prior to the experiment because there was bound to results that are out of pattern so repeating this many times would eliminate systematic errors resulting in more accurate and reliable data. The dependant variable is the heart rate of the shrimp will be measured over 10 seconds Ccontrol variables: These are variables that should be kept the same. As a result the effect other factors other than coffee content are limited. This is needed as the objective is to investigate the effects of caffeine content. The control variables ensure valid data.Volume of solution The time heartbeat is measured within Temperature: Daphnia may be very sensitive to the heat therefore the kinetic energy given to them by heat could have effects on the heart rate. Same culture of Daphnia: To minimise genetic differences. The size of the shrimp can change the degree of the effect of caffeine. The larger shrimp will have a lower heart rate. I will ensure this as best as possible by kee ping the Daphnia in the same light intensity by shining a lamp directly at it.Preliminary experimentI did a preliminary experiment to familiarise myself with the methods so no time is wasted during the actual experiment. It helped me identify the limitations in the experiment and how to conduct the experiment appropriately. For example I noted not to add too much of each solution on the microscope as there will be a loss of surface tension and it will spill. I also learnt to not use the slide covers as they kill the Daphnia Analysis The mean heart rate of Daphnia shrimp placed in solution B is 26. 5% higher than the heart rate of the Daphnia placed in the control solution.Furthermore it is 1.9 % less than Solution A ( less difference than I predicted. From these results we can infer that Solution B is the solution containing decaffeinated coffee. This is because the mean heart rate is lower than caffeinated coffee and higher than the control solution. This is because decaffeinated c offee contains caffeine but significantly lower per milligram than caffeinated solution. However this Solution A, caffeinate coffee caused the daphnia heart rate to increase the most. This proves the hypothesis because the greater the caffeine content, the more neurotransmitters are released.The increase in this neuronal stimulation is interpreted as an emergency in organisms causing adrenaline to be released therefore heart rate increases. There still appears to be fluctuations that are probably caused by systematic errors. The data from shrimp placed in solution A (caffeinated coffee) has the greatest variation in results at 168 compared to solution B, 108. Evaluation Reliability: My results appear fairly reliable because there is an obvious pattern occurs and it supports my prediction. The experiment was carried out as a blind trial whereby the solutions except for the control are unknown.This helps eliminate bias whereby I don’t choose some results and ignore others to su pport my prediction making the results more reliable. Validity Systematic errors could have caused this for example I did not give time for the Daphnia to absorb the solution before counting the heart rate. These factors could have also caused the fluctuations in the results so accuracy is questionable. The variation in caffeinated and decaffeinated coffee could have been caused by systematic errors. For example, the Daphnia could have already been dead.There was a significant drop between the eighth and ninth test of solution A ( around 54. 7%) I did not expect this because caffeine is a stimulant drug. This suggest that the shrimp have different tolerance towards caffeine and some may have been dying. Furthermore the heart rate of some shrimp could be distinctly different from the other shrimps as they were trying to escape the cotton fibres which requires more energy thus hear rate increases. This suggests that the culture of Daphnia used in the experiment could have contained sh rimp that are different age and size.Although I tested each concentration 10 times, there is still a lot of variability of the results. Water, on the other hand has the lowest variability of only 60. The variability in the other contents are at 168 (caffeinated coffee) and 108 ( decaffeinated coffee) This could perhaps be the effect of other chemicals in caffeine which Daphnia are responsive to. Accuracy Certain methods of collecting data were not accurate therefore affecting the validity. For example, a random error such as not tapping the pen in the rhythm of the heartbeat affected the number of heart beats per minute.

analyze the role of managers - 1077 Words

A business is nothing without its required key players being the managers and upper management staff. There is a massive role that these people play in the industry. There are various levels in the chain of command. There are executive level management, Directors and managers that are for the most part the lowest ranking of managers. Some organizations have positions as team leader that are also included in the management staff. When we get in to the topic of management and their functional areas in business we are referring to those at an upper management level. The main drive or task these mangers uphold is to make sure that the goals and company vision is achieved. This is†¦show more content†¦One important factor in the role in the manager is the ability to remain in the role. As important as it is to have any great quality as a manager; it is equally important for the organization to accept the manager in their role. There are many conclusions or even perceptions th at members of an organization may have depending on the idea of a manager’s role continuance. Does the manager position have a high turnover rate? Are the duties and the roles of the manager constantly changing? These can all have an impact on employee morale, and organizational integrity alike. With the advent of social media, word can spread very quickly about role continuance, or any of these factors. If the role of a manager is diminished in any capacity, whether it is leadership, operations, coaching, striving for effectiveness, or role continuance is perceived to be either positive or negative, this can have a substantial effect on how people view an organization. For this reason, it is very important that people pay close attention to the roles of manager within a business. We have analyzed the functional roles of a manager in the business area. We have defined all the roles a manager/leader plays in an organization. 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