The<unk>  (CD) of motion perception helps understand how the mind can detect motion through the visual system, even though the body is not moving. When a signal is sent from the motor cortex of the brain to the eye muscles, a copy of that signal (see efference copy) is sent through the brain as well. The brain does this in order to distinguish real movements in the visual world from our own body and eye movement. The original signal and copy signal are then believed to be compared somewhere in the brain. Such a structure has not yet been identified, but it is believed to be the Medial Superior Temporal Area (MST). The original signal and copy need to be compared in order to determine if the change in vision was caused by eye movement or movement in the world. If the two signals cancel then no motion is perceived, but if they do not cancel then the residual signal is perceived as motion in the real world. Without a<unk><unk>  signal, the world would seem to spin around every time the eyes moved. It is important to note that<unk><unk>  and efference copy are sometimes used synonymously, they were originally coined for much different applications, with<unk><unk>  being used in a much broader sense. __TOC__
Corollary discharge theory
Spike-timing-dependent plasticity
Activation-synthesis hypothesis
Lateral inhibition
Counterstimulation
Presynaptic inhibition
Somatosensory amplification
Neuronal tuning