feature integration theory
> what happens in preattentive state
> what happens in focussed attention?
preattentive state: features percieved seperately
focussed attention: features combined
how to use the staircase method when making use of adaptive testing?
present stimuli
> stimulus intensity is decreased when stimulus is perceived
> stimulus intensity is increased when stimulus is not perceived
when calculating the difference threshold, what values are used? why?
difference threshold:
> average 25% and 75% values
> do not use 0% and 100%, because performance is never optimal
the pupillary light response depends on what 3 factors?
- whether you are aware of the stimulus
- whether you are paying attention to it
- whether you are thinking about it
4 reasons to use reaction time in experiments
why use reaction time:
- permits studying the syste when it is functioning well
- the time to initiate a response may be a more sensitive indicator of the underlying process than which response is chosen
- RTs are good at revealing the temporal organization of mental processes
- data suggests that RTs are informational
what is a difference in deviance in fast and slow saccades?
fast saccades: more frequently towards distractor
slow saccades: more frequently away from distractor
> enough time for top-down control
trajectory deviation
> what happens when distractor is close to target?
distractor close to target:
> target AND distractor show activation peak
> those combine spatially somewhere in the space between target and distractor
> saccade deviates towards distractor
trajectory deviation
> what happens when distractor is far away?
distractor far away
> distractor activity peak gets inhibited
> inhibition area overlaps partly with activiation from target, skewing the peak away from distractor
> saccade deviates away from distractor
