Neuroscience Study Outline III

Neuroscience Study Outline III - Neuroscience Study...

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Neuroscience Study Outline: Exam III I. Sensory and Perceptual Experience A. General Principles of Sensory and Perceptual Experience (Ch. 7.1) 1. Exteroceptive sensory systems -the five systems that interpret stimuli from outside the body: vision, hearing, touch, smell, and taste. 2 . Three types of Sensory Cortex Primary sensory cortex -area of sensory cortex that receives most o its input directly from the thalamic relay nuclei of that system Secondary sensory cortex -areas of the sensory cortex that receive most of their input from the primary sensory cortex of the area system or from other areas of the secondary sensory cortex o the same system. Association Cortex -any area of cortex that receives input from more than one sensory system 3. Most input to areas of association cortex comes from areas of secondary motor cortex 4. Heirarchical Organization A system whose members can be assigned to specific levels or ranks in relation to one another Organized on basis of specificity and complexity of their function Each level receives input from lower levels and adds another layer of analysis before passing it on up The higher the level of damage, the more specific and complex the deficit. Receptors (lowest)—Thalamic Relay Nuclei—Primary Sensory Cortex— Secondary Sensory Cortex—Association Cortex (highest)
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The Process of Perceiving 1. Sensation -process of detecting the presence of stimuli 2. Perception -the higher-order process of integrating, recognizing, and interpreting complete patterns of sensations 4. Functional Segregation Functional Segregation -organization into different areas, each of which performs a different function (ex.-in sensory systems, different areas of secondary and association cortex analyze different aspects of the same sensory stimulus) 5. Parallel Processing Serial system -system in which information flows among the components over just one pathway (like a string through a strand of beads.) Sensory systems are parallel systems (information flows through the components over multiple pathways) Parallel Processing -simultaneous analysis of a signal in different ways by the multiple parallel pathways of a neural network Two different kinds of parallel streams of analysis in our sensory systems: 1. One that is capable of influencing our behavior without our conscious awareness 2. One that influences our behavior by engaging our conscious awareness. 6. Current Model of Sensory System Organization Subsequent research has established that sensory systems are hierarchical, functionally segregated, and parallel . Binding Problem -how does the brain combine individual sensory attributes to produce integrated perceptions? One possible solution
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This note was uploaded on 04/29/2008 for the course NSC 1306 taught by Professor Patton,keale,diaz-granados,weaver during the Spring '07 term at Baylor.

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Neuroscience Study Outline III - Neuroscience Study...

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