The concern of these experiments was with tho properties of response units to a simple stimulus, presented in tho visual or auditory mode. It was found that tho HT for a given letter is affected by the organization of tho response unit by its position and by tho size of the response unit. The HT's for all items in rcaponso units were nffcctod by the modality; BT's to visually presented stimuli were slower at all positions in the response units. The frequency of errors in the auditory series was almost, twice that of the visual series. There was no consistent carryover of pruct.ieu with one response unit to enoehcr made up of a smaller or larger number of itoms. In each facet of the invest.igut.ion, therefore, thero was a strong indication that there is n higher order of motor response integratiun in which a number of responses become orgn.nized into units which have characteristics of their own.
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