Eye-Hand Coordination in Rhythmical Pointing

  • Lazzari Stefano
  • Mottet Denis
  • Vercher Jean-Louis

  • Coupling
  • Phase synchronization
  • Saccadic eye movements
  • Speed-accuracy trade-off


The authors investigated the relation between hand kinematics and eye movements in 2 variants of a rhythmical Fitts's task in which eye movements were necessary or not necessary. P. M. Fitts's (1954) law held in both conditions with similar slope and marginal differences in hand-kinematic patterns and movement continuity. Movement continuity and eye-hand synchronization were more directly related to movement time than to task index of difficulty. When movement time was decreased to fewer than 350 ms, eye-hand synchronization switched from continuous monitoring to intermittent control. The 1:1 frequency ratio with stable pi/6 relative phase changed for 1:3 and 1:5 frequency ratios with less stable phase relations. The authors Conclude that eye and hand movements in a rhythmical Fitts's task are dynamically synchronized to produce the best behavioral performance.