For 7 of 24 Ss, a single light flash evoked an unanticipated short-latency (100–200 msec.) increase in voltage between 2 fingertip electrodes passing a 2 μa. of direct current. The occurrence of this electrodermal phenomenon and the occurrence of a traffic accident over a 3-yr. period were related at the .059 level. This finding is discussed in relation to simple reaction time and driving GSR. In addition, consideration is given to possible reasons why this short-latency phenomenon has not been reported in some 1000 electrodermal studies covering a century.
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