Cognitive Foreperiod
- Time before stimulus
- Prepare to act
Constant FP
- No uncertainty
- Up to ~150ms : RT decrease, then increase
- People prepare if warning - faster
- if longer intervals
- avg response time increases
- Temporal estimates get noiser : Temporal Uncertainty
- not really prepared
- Faster if less time to prepare
Variable FP
- Faster if more time to prepare
- Asymptotic decrease : plateau
- Try your best based on exp to be prepared
- But stay prepared if you already are
- “Strategic” : aim to be prepared as late
- Why? Dunno. Maybe energy conservation
Distribution Effects
- Uniform
- Exponential
- Many shorts
- Anti Exponential
- Many long
- Prep strategy altered based on which type of distribution
Sequential Effects
- Prep dependent on previous trials
- If prev short, present longer : RTs are slow
- Traces of gradually forgetting previous trials
- in the shape of prep effects
- Cannot just be accounted for by n-1 trials
Transfer Effects
- Start with uniform - then something else - then uniform again
- Long lasting effects
- Even if participants were informed that things changed
- Even a week later
Motivation Determined by
-
Time
-
Memory
-
Motivation - still works on earlier prep?