The ASL eyetracker element configures Inquisit to interoperate with an ASL eye tracker.

Syntax

<eyetracker>
/ file = "asleyetracker.dll"
/ comportnumber = integer
/ configfile = "path"
/ eyeheadintegration = true or false
/ lptportnumber = integer
</eyetracker>

Properties

eyetracker.file
eyetracker.comportnumber
eyetracker.configfile
eyetracker.eyeheadintegration
eyetracker.lastpupilheight
eyetracker.lastpupilwidth
eyetracker.lastx
eyetracker.lasty
eyetracker.lptportnumber
eyetracker.maxpupilheight
eyetracker.maxpupilwidth
eyetracker.meanpupilheight
eyetracker.meanpupilwidth
eyetracker.minpupilheight
eyetracker.minpupilwidth
eyetracker.name
eyetracker.typename

Remarks

They eyetracker element can be configured to enable two way communication with an ASL eyetracker during an Inquisit data collection session. Using this element, Inquisit can send XDAT markers to the eye tracker to signal various events such as the onset and offset of a visual stimulus, or the point at which the participant makes a response.

In addition, Inquisit can read data sent through the eye tracker through the serial out cable such as the x and y coordinates of the participant's current point of gaze, or the size of the pupil diameter. This information can be accessed through properties of the eye tracker element. The eyetracker can also be specified as the inputdevice, in which case a response on a given trial can be defined as when the participant's gaze enters a certain region of the screen. This provides a convenient way to measure, for example, which stimulus the participant first looks at and how long it took them to direct their gaze at the stimulus.

For more details, see the article Using an ASL Eye Tracker with Inquisit.

Examples

The following configures Inquisit to communicate with the ASL Eye Tracker through COM1 and LPT1:

<eyetracker>
/ file = "asleyetracker.dll"
/ comportnumber = "1"
/ lptportnumber = "1"
</eyetracker>