The SR Research Test Constructor SREB is a visual test creation tool for use by Psychologists and Neuroscientists. The SREB was created to be easy to use while maintaining a higher degree of flexibility. This unique design combination allows for a variety of experimental paradigms to be created by someone with little or no development or scripting expertise. When found in mixture with the SR Research EyeLinkÂ attention traffic monitoring system, the SREB provides smooth integration into the EyeLink hardware and software program.
Experiments are manufactured in the Test Builder by dragging and dropping test components into a workspace and configuring the properties of the added components. There are two main classes of test components in the Experiment Builder: Actions and Triggers. Activities inform the computer to do something, like displaying a couple of design on the screen or playing a sound. Triggers establish the conditions that must definitely be fulfilled before an action can be carried out. The move of the experiment is attained by hooking up sequentially related components in the workspace in a movement diagram like fashion.
One of the important principles in SR Research Experiment Builder is hierarchical company of events within an experiment. An average test can be dissected into several levels along a hierarchy of Experiment â†' Blocks â†' Tests â†' Trial Runtime / Taking. All the incidents within each degree of this hierarchy can be easily covered in a loop (called series or sub-graph in Test Builder). This enables the whole collection to be connected to other objects as a product and be repeated several times in a row.
Creating EyeLink Experiments
To create an Test out SR Research Experiment Builder, an individual needs to take the next the next steps:
Building and Test-running Experiment
Participant Data Set in place Randomization
Following these, a couple of files are produced so that the test can be run for data collection without counting on the Experiment Contractor application. To demonstrate the use of Experiment Builder, a simple eye-tracking experiment can be shown which runs three blocks of four trials. In each trial, an individual word is viewed at the heart of the display.
Creating a fresh Experiment Session
Click on the Test Builder to begin a new procedure. When the application starts:
Click on "Record ïï¾ New" on the application form menu bar.
In the next "New Task" dialog package, enter "Simple" in the "Project Name" edit box.
Click on the button on the right end of the "Project Location" to search to the directory where the test project should be saved. If you're manually stepping into the "Project Location" field, please ensure that the intended directory already exists.
Make sure that "EyeLink Experiment" package is examined for an EyeLink experiment.
Note: An individual shouldn't manually add or remove documents in the test directory.
Configuring Experiment Choice Settings
After a fresh experiment session is created, the user needs to check if the default display and screen inclination adjustments are fine for the experiment to be created.
Select "Edit ïï¾ Personal preferences" from the application form menu club or press the "F4" key.
Click on "Personal preferences ïï¾ Experiment ïï¾ Devices ïï¾ Display" to check display settings. Ensure that the adjustments (Width, Height, Parts per Pixel, and Refresh Rate) used are backed by your video card and keep an eye on.
Click on "Choices ïï¾ Screen" to check on Screen Builder settings. Set the Location Type as "Center Position".
If the above settings have been evolved and if you would like to keep carefully the new adjustments as defaults for all your future experiments, click on the button "save properties as default".
Creating Experiment Block Sequence
The first rung on the ladder is to include a block sequence for duplicating blocks:
Click on the Experiment Tabs in the Job Explorer Window to start.
Click on the "Action" Tabs of component toolbox.
Select the "Sequence" node, maintain down the still left mouse button and pull it in to the work area.
Place the mouse cursor on top of the "START" node; hold down the still left mouse button while moving the mouse cursor together with the "SEQUENCE" node. This makes the bond from the "START" node to "SEQUENCE" node. (Note: don't make an individual or double click on the START" node as this will choose the node instead. When you have done so, place the mouse cursor on the blank area in the task space and make an individual click there. Redo the current step again. )
Click on any blank area in the work window. Click on the right mouse button and select "Arrange Layout" in the popup menu. This may re-arrange the nodes in a hierarchical fashion.
Click on the Series node in the composition list to continue.
Editing Block Sequence
Next, one should modify the properties of the Stop Sequence. This involves changing the "Label" of the collection to make it more important and changing the "iteration count" (final number of that time period a sequence must be performed) to the actual range of blocks to be analyzed.
Click on the worthiness field of the "Label" property of the Sequence created. Write "BLOCK" in the written text editor and press the ENTER key to complete.
Click on the "Iteration Count number" value field and enter "3" as the full total number of series loops.
In the test Work Space, dual click on the Sequence object to keep.
In each block, one has to first give an teaching, execute a camera setup, calibration, and then run the tests (a good example has been listed below)
Click on the "Action" Tabs of the element toolbox, select the "Screen" action, hold down the left mouse button and drag the action into the work area.
Click on the "Cause" Tabs of the aspect toolbox, select the "Keyboard" trigger, carry down the remaining mouse button and pull the action into the workshop.
Add an "EyeLinkÂ Button" cause to the work space.
Add a "Timer" lead to to the task space.
Click on the Timer result in and arranged the length of time to 20000 msec.
Click on the "Action" Tabs of the aspect toolbox and put in a "Camera Setup" action to the task space. Click on the action and place 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 likely be our trial sequence.
Place the mouse cursor together with the "START" node. Maintain down the remaining mouse button while moving the mouse together with the Screen_SCREEN node. This makes the bond from the "start" node to the "DISPLAY_SCREEN" node.
Similarly, connect from "DISPLAY_SCREEN" to KEYBOARD, EL_BUTTON, TIMER causes. Note that lots is put into these contacts, indicating the analysis order on the list of three trigger types.
Make the connection from the second option three triggers to the "EL_CAMERA_SETUP" node and from "EL_CAMERA_SETUP" to the SEQUENCE node.
Click at any blank area in the task window. Click on the right mouse button and select "Arrange Layout" in the popup menu. This can re-arrange the nodes within an orderly fashion.
Double go through the "DISPLAY_SCREEN" subject in the task space (not from the composition list) until the Screen Builder interfaces shown in the Graph Editor Screen.
Creating Training Screen
The user may choose to provide instructions to the participants at the start of the test. This is done by creating a graphic file filled with the experiment instructions and then using Screen_SCREEN action to show the image. The training text can be created with the multiline text message resource. In today's example, multiline wording resource wording source can be used.
Click on the multiline content material resource button on the display screen builder toolbar to select the sort of source to be added.
Click anywhere on the display.
In the following Multiline Text Tool Editor:
Enter the instruction text.
Press CTRL + A to choose all text came into.
Click the "Margins" button box to set the text margins. Enter 100 (or desired value) in all fields. Click on the "OK" button on the dialog container.
Make sure that the text continues to be selected. Now click the control keys on the toolbar to set the desired text appearance (font name, font size, font style, position style, range spacing, and text coloring).
Click on the "Close" button at the very top right area of the dialog to complete.
To work with images rather than texts:
The image learning resource is adaptable enough to support various modes of displaying (e. g. , original image size vs. extended, top-left aligned or centred). The next discusses the option of exhibiting images in original size or stretching out it to a specific dimension.
To display the image in original size, after the image is added to the display, an individual should have "Use Original Size" field of the image inspected. Please be aware that, allowing 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 set width and level (1024 Ã- 768 for example), after the image is added to the display, an individual should first make sure that the "Use Original Size" field is unchecked. Check the worth of "Width" and "Height" fields of test image added and change them if possible. In addition, an individual may need to check the beliefs of "Clipping Location", "Clipping Width" and "Clipping Elevation" features, which are used to regulate 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 obviously top-left based and the location is relative to the top-left spot of the image.
If images are extended to different measurements, an individual should add two columns in the test data source to specify the required image width and level. After the sample image is put into the display, an individual should send the width, elevation, clip width, and clip elevation of the image to both columns created in the data source.
Editing Trial Sequence: Data Source
Next, one must work on the sequence, which will contain all necessary causes and actions in each trial. One would also need to create a data source to be utilized for setting variables in individual tests.
Click on the previous "Collection" node on the composition list to start out.
In the house table, go through the value field of "LABEL". Establish it to "TRIAL".
Click on the "DATABASES" property to bring up DATABASES Editor.
Click on the "Add Column" button. In the next dialog field, type "Trial" (without quotation markings) in the Column Name editor box and establish Column type as "Number". Click "Fine" button to complete. Go through the "Add Column" button again. Placed the Column Name as "Word" and Column type as "String". Click "Fine" button to complete.
Click on the "Add Row" button. Enter the desired amount (here 12) in the "Quantity of Rows" edit package to generate the amount of rows of vacant skin cells (here 12).
Click on the vacant skin cells of the stand just generated. Because of this example, the values of the "Trial" column are established 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 "Break up by" value field. Enter a value (here . This makes certain that only 4 tests are run in each block. )
Double click on the "TRIAL" series node in the framework list. Click on Start node under it to keep.
Editing Trial Collection: Preparing Series and Drift Correction
Each recording trial should start with a prepare series action, followed by a drift correction action, and then by the real trial taking. The prepare collection action allows an individual to preload the image files or audio videos for real-time image pulling or sound learning, to draw feedback images on the Host PC to evaluate members' performance, also to reinitialize trigger configurations. The user should typically call this action before carrying out a drift modification.
Click on the "Action" Tabs of the part toolbox, choose the "Prepare Sequence" action, maintain down the still left mouse button and move the action into the work space.
Click on the added PREPARE Collection action and review the adjustments in the property table. Be sure to check "Pull To EyeLink Coordinator" field is set to "IMAGE" or "PRIMITIVE". This may get image or simple design on the host screen for the intended purpose of evaluating gaze precision.
Add a "Drift Modification" action from the action tabs of the element toolbox.
Click on the "Action" Tab of toolbox, select the "Collection" node, hold down the still left mouse button and move it in to the work area.
Make a connection from the "START" node to "PREPARE_SEQUENCE", from "Put together_SEQUENCE" to "DRIFT_CORRECTION", and from "DRIFT_Right" 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 within an orderly fashion.
Double go through the newly created collection to fill in the actual incidents in the tracking.
Editing Taking Sequence
In a simple recording sequence, one has to show 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 individual specified time period in secs. The screen is then cleared.
Select the recently added "Sequence" node. Rename the label as "Tracking".
Make sure the "Record" and "Is Real-time" checkboxes are inspected. Double click on the "Taking" node in the composition list until viewing a "START" node under it. Even as double go through the "START" node, the content of the work area windowpane is also up to date.
Click on the "Action" Tab of the aspect toolbox, choose the "screen" action, maintain down the still left mouse button and pull the action in to the workshop.
Click on the "Triggers" Tab of toolbox, choose the "TIMER" node, carry down the still left mouse button and drag the trigger into the work space. Double click on the Timer object. Enter "Periods" (without quote) in the "Concept" value field and 10000 (amount of time in ms) in the "duration" field.
Add an "EyeLinkÂ Button" result in.
Add another "display screen" action. Two times click on the action and change its label as "DISPLAY_BLANK". Also uncheck the "Send EyeLink DV Subject matter" box.
Make a connection from the "START" node to "DISPLAY_SCREEN", from "DISPLAY_SCREEN" to "TIMER", from "Screen_SCREEN" to "EL_BUTTON", from "TIMER" to "DISPLAY_BLANK" and from "EL_BUTTON" to "Screen_BLANK".
Click at any blank area in the work space, then click on the right mouse button and choose "Structure â" in the popup menu. Click okay in the following dialog box. This can re-arrange the nodes in an orderly fashion.
Modifying Properties of Screen Screen
One must first need to check on the property adjustments of the screen actions. For better Data Audience integration and for reaction time calculation, a message should be written to the EDF document to indicate enough time when the stimulus was obvious to the participants. In addition, you can need to draw simple design onto the variety screen so that the participants' gaze exactness during tracking can be evaluated.
Click on the DISPLAY_SCREEN node. In the house windowpane of the action, dual go through the value field of "Message" property. Enter "SYNCTIME" and then press ENTER key to join up the change.
Make sure that the "Send EyeLinkÂ DV Announcements" and "Use for Sponsor Screen" properties are inspected.
Select the "Screen_BLANK" action. Increase click on the value field of "Concept" property. Enter "blank_screen" and then press ENTER key to join up the change.
Make sure both "Send EyeLinkÂ DV Messages" and "Use for Host Display" checkboxes for the "Screen_BLANK" action is unchecked.
Creating Screen Screen
In here, you have to include a text source to the screen and alter the properties of the text reference, such as font name, size, text message to be viewed, and alignment style. One also will need to have to create an interest area for the written text. To get this done, first double click on the "DISPLAY_SCREEN" thing in the task space, before screen builder interface is shown in the Graph Editor Window.
Click on the "Place Text Learning resource" button on the Screen Builder tool pub, and click at any position in the task area.
Double click on the current value of Font Name ("New Times Roman"). This will bring up a dropdown list. Place the new font name as "Arial" (or any other).
Double go through the current value of Font Size (20). Enter the required text size (40) in the written text editor.
Double click on the far right end of the worthiness field of the "Text" property. This will bring up an attribute editor dialog.
Click on DataSource node under "TRIAL" series on the node selection list.
Double go through the "word" node in the node features window. This will likely update the articles of "Attribute" editor dialog as "@".
Click on the "OK" button to finish.
Check the "Use Runtime Expression Segment" pack. This will generate interest area automatically for the written text used.
Select the recently added text source of information, click on both "Horizontal Center Positioning" and "Vertical Middle Alignment" buttons to put the text in the center of the display.
Select the written text resource on the work area, click on the right mouse button, and choose the "Lock Selection" option so the resource will not be moved accidentally.
Writing Trial ID to EDF file
A "TRIALID" subject matter should be written to the EDF file so that the actual test condition under that your trial was conducted can be identified during research.
Click on the Test (the topmost) node in the composition list to start.
In the property table, go through the value field of the "EyeLinkÂ DV Variables" property.
In the next dialog box, for each and every of the parameters to be added to the trial Identification message, select the variable and click on the "ADD" button. The order of the determined variables can be improved with the "Move up" and "Move down" buttons.
Click on "Okay" to finish.
Showing Experiment Improvement Message on Tracker Screen
During trial taking, a text message can be shown at the bottom of the tracker display so the experimenter can be up to date of the test progress. For example, in this experiment, a text like "Trial 1/12 One" on the tracker display screen was shown.
Click on the "Saving" series node in the framework list to start out.
In the property panel, go through the considerably right end of the value field of the "EyeLinkÂ Record Position Note" property.
In the feature editor, go into an formula as:
="Trial " + str(@) + "/12 " +str(@)
Click on the "Fine" button to complete.
Building the Experiment
Click on "Experiment ïï¾ Build" menu to create the experiment. The Editor Selection Tab in the Graph Editor Home window will be place to the "Output" tabs and build information will be shown. Watch out for error (exhibited in red) and warning (in brownish) text messages during building.
The pursuing is a list of common problems during test 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 defined at row. . . for the column. . .
The node cannot be utilized in the sequence
Reference to. . . not found in the graph.
No website link from node.
Infinite loop found
No recording collection found in an EyeLinkÂ experiment.
The pursuing is a set of common warnings during test building:
The keyboard result in and mouse result in can be used in a real-time collection. If this is actually the circumstance, check whether both of these triggers are essential for the test design. If so, uncheck the "Is Real-time" box in the taking sequence.
Default value use in attribute. . .
The user could also test the test by clicking on "Experiment ïï¾ Run" from the application form menu-bar. This will try to connect to the tracker Computer and do the test code. It ought to be noted that should only be used for the purpose of screening and debugging test code. To acquire experiment data, an individual should use the deployed version of the test as it generally does not have to rely on the Test Builder request and can be run on another type of computer.
Deploying the Experiment
After the experiment is built, the user must "deploy" the test to a new. This will generate a couple of files so that the test can be run on a new computer without counting on the Experiment Contractor application. If the data source is used, this will generate a "datasets" subdirectory with a backup of data arranged file in it. The user can create several copies of data arranged data files with the randomizer application
Running the Experiment
To run the experiment, open the listing where the experiment is deployed to and select "
Error in Initializing Design: When you begin the experiment and see an "Problem Initializing Graphics" problem, please check whether the display settings (display screen resolution, colour pieces, and refresh rate) specified for the experiment are reinforced by your video tutorial card. If not, please change the "Preferences â†' Experiment â†' Devices â†' Display" settings.
Error in Tracker Version: SR Research Test Builder works well with both EyeLink and EyeLink II eyeball trackers. The default tracker version is defined to EyeLink II (see "Preferences â†' Test â†' Devices â†' EyeLink"). Therefore, EyeLink I users could see such an error message with the default tracker setting. If this is the case, please establish the tracker-version in these devices configurations to "EyeLink I".
Participant Data Set Randomization
In most tests, the user should randomize trial order so the experiment materials are not presented in the same sequence across members. Randomization of data source can be carried out with either an internal randomizer or an exterior randomizer. These two randomization methods are almost indistinguishable and therefore the user could use the inner 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 task whereas the external randomization can be carried out after deploying the test project.
Data can now be accumulated from the deployed version of the experiment. Double go through the executable data file in the deployed test directory or type in the. exe record name from the command-line fast. If the test uses a data source, a dialog will be shown, allowing the user to find the appropriate data source file. Within an EyeLinkÂ Experiment, an individual may also be asked to enter in the experiment period name. At the End of test, an EDF document will be made for EyeLinkÂ tracking session and saved in the experiment directory. Optional result file(s) will be created if the user has given them in EyeLinkÂ and non-EyeLinkÂ tests.
EyeLinkÂ recording data file can be easily analyzed with EyeLinkÂ Data Viewers as the tests created with Experiment Builder are fully integrated with this examination tool. Experiment Constructor sends information to the data document so that images or simple pulling can be added as overlay history. The user can also designate trial parameters, create interest areas, and send messages for the simple data analysis. The result file(s) from a non-EyeLinkÂ tracking session contains columnar outputs for chosen variables in the test. This record can be easily packed by common reports packages.
Lists of Software Menu Club and Toolbar
File Menu and Tool Buttons
Edit Menu and Tool Buttons
Experiment Menu and Tool Buttons
Lists of Activities, Triggers along with other Node Types
Other Node Types
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