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Psyc 110 Notes 10-27-2011

Psyc 110 Notes 10-27-2011 - Conclusions Each species has a...

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Conclusions Each species has a sensory world, or umwelt, representing stimuli relevant to its natural history Frogs – insects Bats – sound (use to echo locate) Sensory quality is arbitrarily related to physical stimuli Sensory cells transduce physical stimuli; coding of quality (location) and quantity (rate) Transduction – type of receptor being active gives quantity and how fast tell us intensity of signal Odors make a major contribution to flavor; odds affect behavior in many animals, including humans. Fast and slow pain conveyed by separate neuron types (A and C fibers) Gate control theory explains modultion of pain sensitivity by central systems (PAG) Anatomy for Hearing Frequency How often Higher freq has more peaks than lower Amplitude intensity How high about/below the peaks and troughs go. Pressure wave collected by pinna Pressure then goes through canal and presses against eardrum/tympanic membrane Oval window- outer boundary of inner ear which is cochlea – fluid filled structure that’s curled like a snail. Further amplification (20-30x) by transmission from tympanic membrane (air) to oval window (fluid) Chinchilla cochlea Inside the Cochlea Tympanic membrane transmits vibrations through middle ear bones to oval window. Now inside cochlea, have fluid filled area and in the middle is the basilar membrane and sensory hairs that respond to sound.
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