TRACKPixx3 Device Settings

LabMaestro 1.7.0

TRACKPixx3 device settings

ConsoleOverlay: When a 27" monitor is connected to the "DisplayPort Out 2" port on the DATAPixx3, ConsoleOverlay determines the format of both the stimulus display and TRACKPixx3 camera passthrough view. There are four different views available:

• FullStimuliNoTracker: Default view.

• FullStimuliHalfTracker: Recommended view with a TRACKPixx3.

• HalfStimuliFullTracker: Provides a larger TRACKPixx3 camera view than the FullStimuliHalfTracker.

• FullStimuliHalftTracker: Both stimuli and TRACKPixx3 camera views are maximized on the console display.

The FixationDetection function sets the arguments required to generate online fixation flags. Two arguments need to be set: • MinSpeed: This is the threshold required for fixation detection in degrees of visual angle (dva/s). A 30 dva/s threshold is recommended for initial use. • Duration: This argument determines how long the fixation speed must remain below the MinSpeed threshold before generating the fixation flag, in seconds. The value must be a multiple of 1/2000. A 0.005 s value is recommended for initial use.

Distance: The distance, in cm, between the TRACKPixx3 camera and the eyes of the participant. In tabletop TRACKPixx3 setups, this distance is often 60 cm.

FixationDetection: Sets the arguments required to generate online fixation flags. Two arguments need to be set:

• Max Speed: This is the threshold required for fixation detection, in degrees of visual angle (dva/s). A 30 dva/s threshold is recommended for initial setup.

• Duration: This determines how long the fixation speed must remain below the MaxSpeed threshold before generating the fixation flag, in seconds. This value must be a multiple of 1/2000. A 0.005 s value is recommended for initial setup.

SaccadeDetection: Sets the arguments required to generate online saccade flags. Two arguments need to be set:

• MinSpeed: This is the threshold required for saccade detection, in degrees of visual angle (dva/s). A 30 dva/s threshold is recommended for initial setup.

• Duration: This determines how long the fixation speed must remain above the MinSpeed threshold before generating the fixation flag, in seconds. This value must be a multiple of 1/2000. A 0.005 s value is recommended for initial setup.

Infrared Intensity: Set an infrared illuminator intensity. Lowering the IR intensity (or reducing the TRACKPixx3 aperture) might improve eye-tracking quality when spurious corneal reflections are generated on the cornea.