ABSTRACT
How are head-, hand-, and eye-position information combined in directing the hand to an eccentric target? This chapter reports two sets of experiments conducted on normal subjects during visual pointing. The first series records latencies of eye, head, and hand movement and of EMG commands following target presentation. The results indicate a temporal grouping of segmental motor programs for target-oriented actions. The second set measures pointing errors when the head is fixed or free to move. A significant advantage occurs in the latter condition. The implications of these results for views of central integration of signals from eye, head, and hand are discussed.
