PSYCH261 Chapter Notes - Chapter 2.1: Excitatory Postsynaptic Potential, Inhibitory Postsynaptic Potential, Reflex Arc
2 Mar 2019
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Psych 261 - module 2. 1: the concept of the synapse. Properties of synapses reflexes: automatic muscular responses to stimuli reflex arc: circuit from sensory neuron to muscle. Ex; sherrington"s experiment: strapped a dog into a harness above the ground and pinched one of the dog"s feet. After a fraction of a second, the dog flexed (raised) the pinched leg and extended the other legs. Sherrington"s conclusions about properties of reflexes: reflexes are slower than conduction along an axon several weak stimuli presented at nearby places or times produce a stronger reflex than one stimulus alone does. When one set of muscles becomes excited, a diff. set becomes relaxed. Speed of a reflex and delayed transmission at the synapse. When sherrington"s pinched a dog"s foot, dog flexed that leg after a short delay. During that delay, impulse had to travel up an axon from the skin receptor to the spinal cord to muscle.
