Washington: New experimental results have shed light on how mammals act on the basis of sound cues.It`s well known that sounds detected by the ears wind up in a part of the brain called the auditory cortex, where they are translated - transduced - into information that scientists call representations.These representations, in turn, form the informational basis upon which other parts of the brain can make decisions and issue commands for specific actions.What scientists have not understood is what happens between the auditory cortex and portions of the brain that ultimately issue commands, say, for muscles to move in response to the sound of that car`s screeching brakes.To find out, a team of researchers from Cold Spring Harbor Laboratory (CSHL) trained rats to listen to sounds and to make decisions based on those sounds. When a high-frequency sound is played, the animals are rewarded if they move to the left. When the sound is low-pitched, the reward is given if the animal moves right.
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