Figure 2.

The object detection task performed by monkey 2. Each trial began with the monkey looking at a fixation point. After a brief delay, images were presented, in random order, each for 200 ms. At a randomly preselected point in the trial, an image containing a motorcycle appeared. The monkey then had 500 ms to saccade to the response dot to receive a juice reward. In the intervening time, images continued to stream. To ensure that the monkey was performing an object recognition task as opposed to relying on low-level visual cues, the motorcycle was presented at different scales, positions, and on different backgrounds. In addition, novel motorcycle images were introduced each day (supplemental Fig. 3, available at www.jneurosci.org as supplemental material).