Figure 2.

The curve-tracing task and the behavioral performance of the monkeys. A, Curve-tracing task. When the monkeys directed their gaze to a fixation point (FP), we presented two curves with circles at their end. One of the curves was connected to the fixation point [target curve (T)], whereas the other one was not [distracter (D)]. The RF of the V1 neurons under study either fell on the target or on the distracter curve. The monkeys had to make an eye movement to the circle at the end of the target curve after a delay of 500 ms. B, Behavioral performance of the two monkeys as a function of the luminance contrast of the two curves. C, Receptive fields of the recording sites in the two monkeys relative to the two curves.