PDF | The Eyelink Toolbox software supports the measurement of eye movements. The toolbox provides an interface between a high-level interpreted language. Eye Tracking with MATLAB and the Psychophysics Toolbox. The Eyelink Toolbox software supports the measurement of eye movements by providing an. Behav Res Methods Instrum Comput. Nov;34(4) The Eyelink Toolbox: eye tracking with MATLAB and the Psychophysics Toolbox. Cornelissen .
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The goals are very modest. This post includes various lines of eylink throughout this post, but the full files can be downloaded from the links at the bottom. Many of those links are private and will only work if you are a member of one of those labs. This post is not designed to be a full introduction to the Eyelink toolbox within PTB. These are just a few bits of code that I have found useful. But, my needs have so far been really simple i. The main resource in this post is tooblox the collection of links in the next section.
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Before moving to the next session, it may make sense to look through their manuals. The manuals are, well, manuals, but eyekink through them takes less time than their length might suggest.
If you are not a member of our lab, you may be able to ask a member of the hMRC to share the manuals. Without tooblox licensing key, the version of the data viewer that can be downloaded is more or less useless but, here it is. Instead, for working with the data in R, see edfR and itrackR. Note that these are only working on Mac and Linux. This section walks through a function that initializes the eyelink system.
This defines a struct with a number of default parameters, el about how the eyetracker will operate. After the parameters in el have been modified, this function calls EyelinkUpdateDefaults el to indicate to inform the eyelink system that the parameters should change. The main other point of this function etelink to start the eyetracker calibration.
That should be done at the start of each run. In setupEyeTrackeryou may have noticed many calls that took the following format Eyelink ‘dosomethingspecial’. This is a function internal to PTB. It runs the calibration routine. I rerun the calibration at the start of each experimental run.
Psychtoolbox-3 – EyelinkToolbox
So, include a command like. Since this will probably be run in the scanner, a sensible time to place that would be shortly after receiving the scanner trigger, but before the next flip.
Note that the filename can be no longer than 8 characters and cannot contain any special characters only digits and letters. This makes developing and testing an experimental script challenging, because if we litter our code with calls to Eyelink Credit goes to Will Hopper for showing me toopbox strategy when designing functions that receive input.
The main idea is two wrap all calls to Eyelink The outer function, makeEyelinkFcn receives as input the variable handlerNamewhich can be either none or T Depending on that variable, the output to eyelinkFcn is then a call to an anonymous function which implements the actual calls to Eyelink. This enables the writing of code that will call the eyelink functions when desired e. So long as input.
The eydlink of this script defines the local function T60which allows all of the necessary wrapping to the different Eyelink For examples of these methods in action, check out an experiment on Voxel Tuning Functions. In particular, see setupEyeTrackermakeEyelinkFcn. That repository eylink has examples of using the value returned by makeEyelinkFcn in runContrast. Note that the repository may change from time to time and might not match the code in this post exactly.
To download the exact files defined above, see setupEyeTrackermakeEyelinkFcn. See a list of Eyelink functions here. Tooobox options relating to saving data are for another post. Of course, a similar effect could eelink acheived by littering the experimental code with a bunch of if then else statements. However, this method has the advantage of massively eyelini the number of switch statements in the code. Fewer switch statements can be easier to follow and modify, because most of the effect of the input.
Initializing Eyelink This section walks through a function that initializes the eyelink system. Main goal is to modify defaults set in EyelinkInitDefaults. Cannot toolboox longer than 8 characters before file extention.
File extension must be ‘. The various color arguments Eyelink changes the background color of whatever screen is open.
The Eyelink Toolbox: Eye Tracking with MATLAB and the Psychophysics Toolbox.
So, these colors e. The issue is bad enough that it can be almost impossible to calibrate the tracker when the calibration dots appear on the edges. For this reason, I reduce the size of the calibration. Again, my needs are pretty simple and calibration can be challenging, so 5 seems good enough.
Wrapping the function in a switch argument e. The Eyelink functions In setupEyeTrackeryou may have noticed many calls that took the following format Eyrlink ‘dosomethingspecial’. Extra Resourcess For examples of these methods in action, check out an experiment on Voxel Tuning Functions.
Patrick Sadil Graduate Student.