Omnidirectional increase in threshold for image shifts during saccadic eye movements

The visual system must maintain a stable metric ofvisual space despite changes in the retinal position ofthe world during eye movements. To meet thischallenge, there must be a mechanism for differen­tiating retinal shifts due to eye movement from shiftsdue to the displacement of objects in the world.Whipple and Wallach (1978) have termed this an"accounting" mechanism, while we have previouslydiscussed it as a frame-of-reference computation(Stark, Kong, Schwartz, Hendry, & Bridgeman,1976). This mechanism becomes less sensitive duringtarget displacements due to saccades, an effect whichhas been analyzed experimentally as a saccadic sup­pression of displacement. The failure of subjects todetect target movements occurring during eyemovements, then, provides a tool for investigating themechanism which accomplishes subjective stabiliza­tion.The recent paper of Whipple and Wallach in

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