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PSYC 100 (335)

Sensation and Perception

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PSYC 100
Ingrid Johnsrude

Sensation and Perception 6/8/2012 6:47:00 AM Sensation – detection of simple properties of stimuli (brightness, colour, warmth) Perception – detection of objects, their locations, their movements and their backgrounds E.g., seeing a colour red is sensation, but seeing a red apple is perception Transduction - the process by which sense organs concert energy from environmental events into neural activity Receptor cell – a neuron that directly responds to a physical stimulus, such as light or vibrations Anatomical coding – interpreting the location and type of sensory stimulus according to which incoming nerve fibres are active E.g. – rubbing your eyes will mechanically stimulate the light sensitive receptors located there. This then produces action potential in the axons of the nerves that connect the eyes with the brain Temporal coding – the coding of information in terms of a time (such as rate) By firing at a faster or slower rate according to the intensity of a stimulus, an axon can communicate quantitative information to the brain Eg. a light touch to the skin can be encoded by a low rate of firing and a more forceful touch would be a high rate. Anatomical code is where the body is being touched, temporal code is how intense the touch is Psychophysics – system
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