BIEB 166 Lecture 4 (WI13)

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Biol/Ecology, Behavior, & Evol
BIEB 166
James Nieh

Lecture 4 Neuroethology - Study of the neural basis of behavior - Innate releasing mechanism - Part of the nervous system Feature Detector (search image) - Neural mechanism for identifying a key stimulus Toad fly detector 1. Prey capture FAP - Find a visual target - Turn to face prey (show the interest towards the fly) - Shoot out tongue - Retract tongue - Close eyes - Swallows - Wipe mouth - Toads use feature detectors that are built into their eyes and central nervous system 2. Lateral inhibition: mutual inhibition between neighboring cells in a sensory system ○ In the visual system, this enhances edges and thus improves shape detection - Way in which (in this case) the retina sharpens the edges of images so that the toad can recognize objects more clearly against the background 3. Sensitivity to worm-like objects - X: worm-like object - Y: anti-worm (upright position) - Z: a square - Rotate around the toad - If the toad is more interested, it will keep turning - Size must play a role ○ Vary the sizes of XYZ ○ The object is too large for the toad to fit in its mouth ○ More dangerous ○ Loses interest - Elongation of the object in relation to its direction of movement 4. Responses of neurons from optic tectum - The rate of neuron firing goes up when it is more interested in the object - Process of elimination, the neuron responsible for the behavior is figured out - Tectal class T5(2) neurons: show the response most similar to the behavior observed ○ Provides information about the direction of the object a. Capranica's use of acoustical dummies b. Evoked vocal response of the frog c. Male response used as species-specific bioassay 5. Toad response - Lateral inhibition: shape - Tectal Class T5(2) neurons: directions Simple, innately recognized visual sign stimuli are generally extracted by feature detectors Sensory system: device for extracting relevant information/device for throwing information away Frog Song - Males get together during mating season, produce calls to attract females, and to compete with each other - Males get together during mating season, produce calls to attract females, and to compete with each other ○ When one male starts calling, the other male starts calling in response ○ Male-male response/"evoked vocal response" ○ Bioassay for KS - Changes of the air when producing sound (acoustical dummies) - Break down spectrum of the sound, and look at the amplitude of sounds ○ Low frequencies are loudest - They only response to songs of their own species 1. Configurational stimulus of sound frequencies - Feature detector in frog's
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