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Unformatted text preview: Lecture 4 SUMMARY I. II. NEUROETHOLOGY FEATURE D ETECTOR I I I . CENTRAL P ATTERN G ENERATOR IV. MOTIVATION Behavioral Neurobiology LECTURE 4 : B ehavioral N eurobiology I. NEUROETHOLOGY II. FEATURE DETECTOR (search image) a. e.g. (visual): Toad retina; bug detector (Ewert) 1. prey capture FAP 2. worm key stimulus b. Lateral inhibition 1. underlying mechanism of more 2. complex feature detectors c. Tectal class T5(2) neurons: show the response most similar to the behavioral measure 1. Ex. (acoustical): Evoked vocal response of the bullfrog. 2. Male response used as species-specific bioassay d. Capranica ’s use of acoustical dummies e. Configurational stimulus of sound frequencies f. Frishkopf and Goldstein: 1. 2. Feature detector in frog ’s ear Simple cells vs. complex cells Neuroethology = Study of the neural basis of behavior III. CENTRAL PATTERN GENERATOR A neural circuit producing a complex, coordinated motor pattern a. e.g.: cricket song; produced by males Stridulation b. c. Bentley and Hoy: acoustical dummies Features of key stimuli: 1. 2. 3. 4. 5. Duration of syllable Number of syllables / chirp Duration of chirp Inter-chirp interval Inter-syllable interval FEATURE DETECTOR = d. Central pattern generator: thoracic ganglia e. Are pattern generators and feature detectors coupled? 1. Hybridization experiments with crickets (Hoy, Hahn, and Paul 77)....
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