Tactile Temporal Ordering Judgments with Tools: Evidence for Performance that Depends on Hand but Not Tool Location, and on Response Type for Females
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2012
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Haverford College. Department of Psychology
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Award
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eng
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Open Access
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Abstract
Past research has suggested that performance on tactile temporal ordering judgments (TOJ) depends on both the location of the hands and the tools. When judging which hand was presented with one of two vibrotactile stimuli presented to each hand at varying intervals, accuracy levels decreased both when the hands were crossed and when the tools were crossed. This effect of tool crossing alone has been interpreted as evidence for the incorporation of tools into the body schema. However, the studies presented here suggest no effect of tool position on performance. Subjects performed a tactile TOJ with tools task in four conditions: hands and tools uncrossed, hands crossed with the tools uncrossed, hands uncrossed with the tools crossed, and both the hands and tool crossed. Results show a strong effect of hand location, but no effect of tool location, with performance in the hands uncrossed with the tools crossed condition remaining comparable to the hands and tools uncrossed condition. In addition, our findings suggest an interaction between sex and response type, in which female performance when responding with foot pedals, as opposed to with the tools, decreases significantly. This effect was not true for males. This may suggest a difference in the way males and females map somatotopic and external space. Implications for the incorporation of tools into the body schema are discussed.