Evaluating expressions in trigger_watch variables

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1

Hi Chris,

Not sure if this is known behavior, but it looks like putting an expression in the “trigger_watch” fields breaks the circular fixation point stimulus - it outputs false into the trigger_flag variable no matter the value of the expression. It’s not holding me up - as a workaround I created a dummy variable which gets updated whenever the independent variable in the expression gets updated.

I haven’t tested the rectangular fixation point stimulus.

Evan

2

Hi Evan,

Yes, that is known behavior, and it applies to both fixation point types. Changes to the independent variable(s) don’t cause the expression to be re-evaluated. Had you not already thought of that workaround, I would have suggested something similar.

Cheers,
Chris