NEUROBIOLOGY 20

NEUROBIOLOGY 20 - NEUROBIOLOGY Ch. 20 ANALYSIS OF SIMPLE...

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NEUROBIOLOGY NEUROBIOLOGY Ch. 20 Ch. 20 ANALYSIS OF SIMPLE BEHAVIOR ANALYSIS OF SIMPLE BEHAVIOR Servomechanism - a man-made device that uses feedback to regulate output. Figure 20-1 shows the parts of a servomechanism: Effector - produces a desired action Sensor - measures action result Comparator -compares the output from the sensor to that of a desired result (goal, or set-point) Negative feedback- the “subtraction” of the sensor signal from the set point (goal) An example of a servomechanism is the monosynaptic stretch reflex is depicted in Figure 20-2. The effector is the alpha motoneurons and extrafusal muscle fibers The sensor and comparator is the stretch receptor and 1a afferents Set-point is set by higher motor neurons and applied to the stretch receptor by gamma motorneurons and intrafusal muscle fibers. It can be static, as when a limb is held in the same position, or dynamic, as when movement occurs.
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NEUROBIOLOGY 20 - NEUROBIOLOGY Ch. 20 ANALYSIS OF SIMPLE...

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