Proofs for Equal Innervation with Unequal Lateral Movement

  • Bruce Bridgeman
  • Lawrence Stark


In Chapter 2 it was shown how the simultaneous but unequal lateral movements of both eyes or the lateral movement of only one eye while the other stood still could be easily reconciled with the assumption of an always equal innervation of both eyes. A markedly unequal lateral movement occurs only when the new fixation point appears not simply sideways from the originally fixated point but also nearer or further away so that it requires bringing the point of vision nearer or further as well as sidewards turning. If we now wanted to explain such an unequal lateral movement of both eyes from the ability to innervate both eyes simultaneously by different amounts, we would come into contradiction with the experiences recounted above which irrefutably support the assumption of a compulsion to both eyes always being innervated together. A group of direct proofs can be added to this indirect proof for the correctness of my assumption, which I will illustrate with a special example.


Muscle Force Retinal Image Distant Point Median Plane Distant Object 
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Copyright information

© Plenum Press, New York 1997

Authors and Affiliations

  • Bruce Bridgeman
    • 1
  • Lawrence Stark
    • 2
  1. 1.University of CaliforniaSanta CruzUSA
  2. 2.University of CaliforniaBerkeleyUSA

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