A NEW PROCEDURE FOR PSYCHOPHYSICAL ASSESSMENT OF PERFORMANCE ON COINCIDENCE TIMING: EVALUATING THE EFFECTS OF DURATION OF TARGET PRESENTATION AND TARGET MASKING

  • Judith Haldemann
  • Thomas Rammsayer

Abstract

In traditional Coincidence Timing (CT) tasks participants are required to make a response when a moving target coincides with a stationary line. The present study was designed to examine the effects of duration of target presentation and of different levels of target masking on performance on CT. For this purpose, we introduced two newly developed CT tasks. Participants were presented with two lines moving diagonally from the bottom left and right corners across a monitor screen towards each other and intersecting. As indicators of CT performance, mean absolute error (MAE; i.e., the difference in time between the intersection of the two moving lines and the participant’s response) and individual standard deviation (ISD) of response times were computed. While duration of target presentation affected neither MAE nor ISD, a systematic influence of target masking on CT performance could be revealed: MAE and ISD decreased linearly with decreasing size of the mask.

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