lecture 15- linking senses and behaviour to memory Flashcards
what are the 3 levels of analysis in behaviour senses
1- what problem are you trying to solve?
2- what methods can you use to solve?
3- how do we use these methods to solve?
what does the drift diffusion model explain
how a decision maker gradually accumulates noisy evidence over time until reaching a decision threshold
what is noisy evidence
random fluctuations eg. lots of dots not moving and some moving to the left
in a graph of reaction time against frequency, where is the distribution
over to the left
in a graph of 1/RT against frequency , where is the distribution
its a normal distribution
why is the graph of 1/RT against frequency normally distributed
reaction time = height of decision bound/ rate of accumulating evidence
what is the height of decision bound
amount of evidence required to make a decision
what happens in mice when odour sampling time is cut short by a buzzer
the mice makes less accurate decisions
what happens when the decision bound is high
more evidence needed to make decision
slower and more accurate
what happens when the decision bound is low
quick and not accurate
give an example of when the decision bound could be lowered
if someone is hurrying you up
what does the moving dot experiment with monkeys show about LIP activity
stronger sensory input -> LIP activity changes faster
if you line up LIP activity with the monkeys behaviour -> LIP reaches a common threshold before the action
LIP functions as an evidence accumulator
Stronger sensory evidence leads to faster accumulation, reflected in a steeper ramping of LIP activity.
Decisions are made when LIP reaches a fixed threshold, explaining response times and accuracy in perceptual tasks.
describe the Fox P mutant in drosophila
fly takes longer to decide between 2 odours
this is due to excess K+ channels which makes them leaky
this slows the rate of evidence accumulation
