ch02 - Innate Behaviours Behavioural Systems Complexity...

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Innate Behaviours
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Behavioural Systems Complexity Observe behavioural “endpoint” Reductionism Constituent elements Simple systems interact producing complex outcomes Gestält
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Why Study Innate Behaviours? Evolved Learned behaviours have roots in innate behaviours Parallels between learned and innate behaviours Some innate behaviours modifiable Types of innate behaviours Homeostasis, reflexes, tropisms, modal action patterns, reaction chains
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Elicited Behaviours Behaviour occurs in reaction to an environmental stimulus For example: Face moving stimulus in peripheral vision Sneeze if inhaling dust, a bug, etc.
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Homeostasis Internal balance of the body Drives Regulatory drives
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Osmotic Homeostasis Regulating body H 2 O level Example: at a party Eat peanuts/popcorn/chips Increase salt concentration Thirsty. ..drink beer • Increases H 2 0; dilutes salt concentration But, alcohol = diuretic • Pee. ..decreases H 2 0; increases salt concentration even more Thirsty . .. drink more beer • Pee even more; salt concentration increased again Etc. Solution? Drink water!
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Control System Comparator Reference input Actual input Action system Output Feedback system (closed-loop system) Response lag
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Blood Salinity Comparator Output Eat peanuts! Action System Actual input Eat more peanuts! Drink water! Reference input
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Reflexes Stereotypic movement patterns Reliably elicited by appropriate stimulus Survival benefit
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Principles C.S. Sherrington Spinal animals (dogs) Threshold for activation Latency until response Irradiation of response
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Reflex Arc Monosynaptic One sensory and one motor neuron Polysynaptic One or more interneurons connect sensory and motor neurons Interneurons allow processing and/or inhibition within spinal cord All but simplest reflexes
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Monosynaptic Patellar tendon struck Stimulates stretch sensory receptors (muscle spindles) Triggers afferent impulse in sensory nerve fiber of femoral nerve leading to L4 of spinal cord Sensory neuron synapses directly with motor neuron, conveying efferent impulse to quadriceps
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ch02 - Innate Behaviours Behavioural Systems Complexity...

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