We are trying to produce a Go-No-Go task where “go” stimuli are presented 80% of the time on go-predominant blocks, and “no-go” stimuli are presented 80% of the time on no-go-predominant block.
We have tried setting condition expression for the block to 80% for stimulus lists coded as “go” - this didn’t work. As soon as the precentage of trials hit 80%, the experiment stopped, regardless of the number of trials given. We want 60 trials per block.
Then we tried setting condition expression for the number of trials to be less than 60 using a maximum of 48 trials that were coded as being ‘go’ stimulus. This didn’t work either. We end up with too many or too few number of trials. It seems we can’t get it to stick to a certain number of trials even if specified in the condition expression.
Does anyone have any advice on what we are missing/doing wrong??? Alternatively, does anyone have an example of a go-no-go task we could look at?