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NPB%20112%2009%20somato%20slides

NPB%20112%2009%20somato%20slides - NPB 112 Fall 2009 10-6...

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1 NPB 112, Fall 2009: 10-6- 10-8 Outline: I. Sensory physiology: overview (Ch. 9) II. Skin mechanoreceptor types A. Mechanoreceptor B. Thermoreceptors (Ch. 10) 1. Warm receptors 2. Cold receptors C. Nociceptors (pain) 1. A-delta mechanical nociceptor 2. polymodal nociceptor RECEPTOR : specialized neuron or epithelial cell that responds to a specific type or wavelength of environmental energy (process by which environmental energy is transformed by receptor into an electrical signal) ADEQUATE (or appropriate) STIMULUS : type of stimulus energy that activates receptor at the lowest relative intensity
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2 Some terminology RECEPTOR: specialized neuron or epithelial cell that responds to a specific type or wavelength of environmental energy RECEPTIVE FIELD: region on body surface, or area in visual and auditory space, within which an appropriate stimulus activates the receptor (or changes the firing rate of neurons along the sensory pathway) STIMULUS TRANSDUCTION: process by which environmental energy is transformed by receptor into an electrical signal ADEQUATE (or appropriate) STIMULUS: type of stimulus energy that activates receptor at the lowest relative intensity RECEPTOR POTENTIAL (or generator potential): change in receptor membrane potential elicited by appropriate stimulus THRESHOLD: lowest stimulus intensity evoking a measurable change in receptor membrane potential (or perceived on >50% of trials of repeated stimuli) Sensory systems signal what, where, when, and how much stimulation occurs What (modality): accomplished by labeled line (specificity) or some kind of population coding Where : topographic map in sensory cortex How much : population and rate coding When (duration): rate of adaptation to stimulus
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