From Interdepedent to Independent Control of Head and Trunk
From Interdepedent to Independent Control of Head and Trunk
When the sense organs that inform an animal through light, sound, or gravity about its orientation in space are located in the head, and the motor apparatus that controls that orientation is in the trunk, then the control system must somehow account for the position of the head relative to the trunk. If the trunk may be oriented independently of head position, the sensory information must undergo a coordinate transformation, rotatory or translatory or both depending on the respective anatomic and informational degrees of freedom of the neck. These problems are best seen against the background of the evolutionary history of intersegmental relations in many-segmented creatures.
Keywords: light, sound, gravity, orientation, head, trunk, neck
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