PHGY 314 Lecture 3: Cook - lecture 3
11 Feb 2017
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Document Summary
The link between the psychometric curve and the cognitive representation of sensory inputs = signal detection theory. Cognitive rep of a sensory input modeled as a normal distribution. In the brain, there must be a range of representations of what one considers a 6g marble to be. There is variability in what one might consider to be a 6g marble due to noise. This probabilistic representation is a normal distribution with a narrow spread. There is also some such curve that exists for the representation of a 10g marble: centered at 10g but again, there is a narrow spread. The likelihood of making this mistake depends on how close the cognitive reps are to each other how much they overlap. Someone is much more likely to mistake a 8g marble for a 6g one bc those curves overlap much more. Example: your job is to detect 8g marbles and then reject all others as bad marbles.
