Pupil size data

Hi Jaewon,

I have trouble of getting the pupil size (either pupil diameter or area) during the task. I only manage to get the eye position data (x and y) using either eye_postion() or get_analog_data(). For the pupil size, I am sure Eyelink is saving it and I set the Eyelink to send the pupil data in diameter. Is there any function I can use to get 3- column data with x, y and the pupil size? Thanks!

Best,
Joyce

You also need to set NIMH ML to receive the pupil data either through a voltage channel or TCP/IP.

If you receive eye XY signals through voltage channels (i.e., NI board), assign the pupil size input to one of "General Input" on the Input/Output panel of the main menu. Then you can read it like get_analog_data('gen1') in the timing script.


If you receive eye XY signals through TCP/IP, select "Pupil Size" in the "Extra" input menu of the TCP/IP eye tracker setting and read it like get_analog_data('eyeextra').


See also the manual page of get_analog_data().
https://monkeylogic.nimh.nih.gov/docs_RuntimeFunctions.html#get_analog_data

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By the way, change the gain of "Pupil Size" to 1 (and the offset to 0), when you select it in the TCP/IP menu. The XY signals use small gains because their output should be within -10 to 10, but, for pupil size, you want to get it exactly as sent by the eye tracker.