ms_count = 0

[ChristopheRomein]

Hi,

I am working on a project about detecting microsaccades to uncover the locus of covert attention. For the purpose of this project, I have built an eye tracking experiment. Currently, I am in the process of analysing pilot data of this experiment using the PyTrack module. However, while trying to extract microsaccades from the data of several participants using the stim.findMicrosaccades() function, no microsaccades seem to be extracted (ms_count = 0). So far, I have tested multiple participants, and only changing the VFAC threshold multiplier to about 1-2 seems to change the amount of microsaccades detected. However, according to most microsaccade literature, this threshold multiplier should be set to at least 5. I have used the example code provided on GitHub (https://github.com/titoghose/PyTrack/blob/master/getting_started_SAMode.ipynb) to analyse the data. I was wondering whether you might know why no microsaccades are currently detected? The phase of the experiment that I am analysing takes about 2 - 2.5 seconds for each trial (33 trials in total), and participants look at a centrally fixated cue. I use an Eyelink asc file that is similar to the file provided in the example script.

Thanks in advance!

Kind regards,

Christophe Romein