Fig. 1.

Experimental paradigm. In a Hand-Near block, the animal grasps a vertically orientated touch bar placed outside the receptive field (RF, dashed box) at which time a fixation point appears. Two hundred milliseconds later, an oriented bar is displayed within the RF for 300 ms. In a Hand-Away block, the touch bar apparatus remains visible, but no reach is made by the animal. Reward is given for maintaining fixation and grasp (Hand-Near) or simply maintaining fixation (Hand-Away). The bottom left panel shows the variation in RF diameter [1.3–4.2 degrees of visual angle (dva)] and also the distance between the right edge of the RF and the edge of the fingers (7–10.7 dva). This figure represents a depiction and is not drawn to scale or matched for the color and contrast of the experimental apparatus or the animal.