Experimental Brain Research

, Volume 138, Issue 3, pp 352–358 | Cite as

The gap effect for eye and hand movements in double-step pointing

  • Philippe Boulinguez
  • Jean Blouin
  • Vincent Nougier
Research Article


The existence of a temporal gap between the offset of a fixation target and the onset of a peripheral target generally reduces the saccadic and manual reaction time in response to the peripheral target. Using a double-step paradigm, the present experiment investigated whether a temporal gap between the extinction of the first target and the presentation of the second target can help in reducing the time to trigger the corrective eye movements and to correct the arm trajectory towards the final target position. A gap was introduced between the presentation of the initial target and a new unexpected goal-target during the movement. The results replicated the gap effect for the corrective saccade to the second target, but revealed an opposite effect for the correction of the reaching movements as the arm correction occurred later in the Gap than in the No-Gap conditions. These results suggest that the information available for the arm motor system to correct the trajectory in relation to the second target was different in the Gap and No-Gap conditions. In the No-Gap condition, the correction of reaching movements would be based on retinal errors between the first and the second targets whereas, in the Gap condition, the correction would be based on information derived from the corrective saccade-related signals to the second target.

Motor control Eye–hand coordination Reaching Double-step Gap paradigm Human 


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Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  • Philippe Boulinguez
    • 1
  • Jean Blouin
    • 2
  • Vincent Nougier
    • 3
  1. 1.Laboratoire d'Analyse de la Performance Motrice Humaine, MSHS, 99 avenue du Recteur Pineau, BP 632, 86022 Poitiers cedex, France
  2. 2.UMR Mouvement et Perception, CNRS et Université de la Méditerranée, Marseille, France
  3. 3.Laboratoire Sport et Performance Motrice, UFR-APS, Université Joseph Fourier, Grenoble, France

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