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PSYA01H3 (1,206)
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Chapter 5

Chapter 5 Notes

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Steve Joordens

Experiments: purple Topics: Green Key terms: yellow CHAPTER 5 (VISION) Sensation: detection of the elementary properties of a stimulus such as brightness, colour, warmth, and sweetness seeing red colour Perception: detection of the more complex properties of a stimulus, including its location and nature; involves learning detection of objects (both animate and inanimate), their locations, their movements, and their background seeing red apple Transduction: The conversion of physical stimuli into changes in the activity of receptor cells of sensory organs process by which the sense organs convert energy from environmental events into neural activity each sense organ responds to a particular form of energy given off by an environmental stimulus and translates that energy into neural firing to which the brain can respond Ex. photons of light striking receptor cone cells cause biochemical changes in a molecule that leads to an action potential Receptor cell: a neuron that directly responds to a physical stimulus, such as light, vibrations, or aromatic molecules releases neurotransmitters that stimulate other neurons which alter the rate of firing of their axons Sensory Coding 2 primary dimensions to all sensory coding: quatitative and qualitative quantitative variation: related to amount of energy present in a sensory stimulus (high decibelloudness sound vs. A low decibelloudness sound) qualitative variation: related to the kind of energy presented in a sensory stimulus (high frequencypitch sound vs. Low frequencypitch sound) Anatomical coding: a means by which the nervous system represents info; diff. features are coded by the activity of diff neurons quality is determined by which specific receptors are activated and which arent (eg. Red cones, but not blue cones, in vision=anatomical coding) Ex. if you rub your eyes, you will mechanically stimulate the light sensitive receptors located there . As a result, the brain acts as if the neural activity int he optic nerves was produced by light-so you see stars and flashes Temporal coding: a means by which the nervous system represents info; diff. features are coded by the activity of diff neurons www.notesolution.com
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