PSYC30018 Lecture Notes - Spring 2018 Lecture 9 - Strange Behaviour, Neural substrate, Neurophysiology
Document Summary
Importance of context: accurately describing the sensation of a colour to others, excitation is not the same as sensation distributed system, may be the same in a local system. How many mechanisms do we need in order to explain our ability to detect colour? detection threshold. Naming and categorisation: krauskopf, williams and heeley (1982) cardinal directions of colour space. Small (4 deg) discs whose colour varied in time along an axis of opponent colour space. Accurate representation of the space requires careful and extensive calibration an absolute essential of psychophysical experiments (define the input absolutely) > objectivity of stimuli. Observers required to indicate whether a test pulse was visible before and after prolonged exposure (30s + 5s) to a similar stimulus modulated along a given axis effect of adaptation on detection. Test pulse a coloured patch which starts off being the same colour as the background; colour is gradually changed until the subject detects the patch (threshold)
