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A memory drum is a piece of laboratory apparatus used to present stimuli in a controlled manner in memory experiments before the advent of computers. Items to be learnt appeared one at a time in the aperture of the drum as it was rotated, either by the experimenter or laterly by timed inputs from a motor.
A theory that proposes that unconscious neural patterns acquired from past experience are stored in the central nervous system as a memory storage drum, analogous to a drum, which is used to store music in old-fashioned roll