Temporal precision of coding as a basic factor of laterality effects in the retention of verbal auditory stimuli.

It is proposed that the encoding of temporal or sequential information is of crucial importance for the explanation of the laterality effect. Evidence favoring this hypothesis is provided by reanalysing the experiment recently published by Mainka and Hörmann (1971). These investigators instructed Ss in a dichotic listening experiment to attend exclusively to material presented either to the right or the left ear. In the present paper free recall performance for words presented to the right and to the left ear was analysed separately with respect to the correspondence between the sequence of presentation and that of recall. It was found that the sequence of presentation and the sequence of recall correspond to a greater extent in the case of right ear material.It is suggested that the well-known laterality effect can be accounted for by assuming differences in the temporal precision of encoding the items presented to the right and left side. This interpretation is substantiated by a review of the research literature. It was assumed that this different accuracy in encoding the sequential aspects of a series of verbal items should result in a different speed in the retrieval of this series. This expectation was confirmed by the data of the experiment of Mainka and Hörmann. Thus, the encoding of temporal or sequential information is supposed to be effected primarily by the left hemisphere.