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Abstract
The concern of these experiments was with the properties of response units to a simple stimulus, presented in the visual or auditory mode. It was found that the RT for a given letter is affected by the organization of the response unit by its position and by the size of the response unit. The RT's for all items in response units were affected by the modality: RT's to visually presented stimuli wore 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 carry over of practice with one response unit to another made up of a smaller or larger number of items.
In each facet of the investigation, therefore, there was a strong indication that there is a higher order of motor response integration in which a number of responses become organized into units which have characteristics of their own.