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| multiple input-output pathways that can operate simultaneously. Produces speed and resistance to damage |
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| different sensory structures operate at varying levels of complexity |
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| Topographical connections |
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| point to point pathways (retinotopic, tonotopic, somatotopic) |
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| pathways generally cross the midline to the opposite side of brain |
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| most sensory pathways synapse in thalamus on way to primary cortex |
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Term
| Columnar Cortical Organization |
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Definition
| the tfunctional unit of sensory cortex seems to be a colum of several hundred neurons approximately a half millimeter o so in diameter. The work of Hubel and Wisel is a notable example with orientation and ocular dominance columns |
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| each sensory system has a multiple maps of the relevant receptor input; the text notes that sensory processing is functionally segregated in these different areas |
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| neuronal codes and the resulting perceptual processes hav ea lawful, but nonlinear, representation of environmental events. Ex. octaves and deibels) |
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| sensory units seem tuned to respond to certain discrete features of environmental stimulation such as lines, edges, pitches, etc. |
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| this is the concept that the goal of sensory systems in NOT t produce a perfect representation of the environmental stimuli, rather a practical model "good enough" to guide adaptive behavior in a timely fashion |
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| most sensory systems will stop responding if the stimulus situation is static. Ex. eye mevements, edges, olfactory adaptation, tactile stimuli, etc. |
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| sensory systems are not passive, they send efferent commands out to receptors or sensory pathway nuclei to influence the selection and processing of input |
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| the so called executive centers of the brain (sometimes defined as working memory, thought o be in prefrontal cortex) can emphasize certain senses and exclude others, making adjustments on a split second basis |
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