Elements of sensation

Elements of sensation - 1 Rapidly-adapting type phasic...

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Elements of sensation: types of information conveyed by a sensation 1. Modality: quality or type of sensation Labeled line (specificity) principle: Johannes Mueller; Modality discrimination is due to the specific destination of the sensory information in the brain, not due to the different receptors or patterns of APs transmitted Pattern theory: modality discrimination is due to different temporal patterns of APs 2. Location: most sensations also convey a sense of the location where the stimulus originated 3. Intensity: perceived strength of the stimulus Adaptation of sensory receptors Spontaneous decrease in sensational intensity
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Unformatted text preview: 1. Rapidly-adapting type: phasic component only 2. Slowly-adapting type: phasic and tonic components 3. Non-adapting type: tonic component only Mechanism of the receptor adaptation: Coding of intensity: relationship between stimulus strength and sensation intensity 4. Affect: different emotional component of modalities Four principles governing the organization of CNS pathways 1. Each major system in the brain is composed of several distinct pathways in parallel. 2. Each pathway contains synaptic relays. 3. Each pathway is topographically organized. 4. Most pathways are crossed....
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