THE SPATIAL PROXIMITY HYPOTHESIS OF THE HAND ADVANTAGE IN SPATIAL PRECUING TASKS - A SHORT NOTE CONCERNING DISCREPANT CRITERION EFFECTS

Within the context of the spatial precuing paradigm a consistent finding is that with the hands placed adjacently precuing of two fingers on the same hand results in faster discrete finger responses than precuing of two fingers on different hands. This phenomenon is known as the 'hand advantage'. Both Miller (1982) and Reeve and Proctor (1984) considered, and rejected, the 'spatial proximity' hypothesis as a possible perceptual explanation of the hand advantage. However, data reported by Miller (1982) and Reeve and Proctor (1984) to discount the spatial proximity hypothesis showed a puzzling inconsistency which weakened the strength of the rejection. In this article I address this inconsistency theoretically and experimentally. I conclude that its origin lies in differential operationalizations of the concept 'preparation effect'. This conclusion justifies rejection of the spatial proximity hypothesis.