Abstract
Sensory input induces gamma band activity in the reticular activating system that participates in preconscious awareness, the process necessary to support a state capable of reliably assessing the world around us on a continuous basis. This process is manifested rapidly upon waking, following increased blood flow in the thalamus and brain stem that occurs ahead of increases in cortical blood flow. This mechanism is also involved in the preconscious activity necessary for the preparation for voluntary movements. This occurs in advance of the subjective sensation of will or intention to move, that is, preconsciously.
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