FIGURE 1. Behavioural task.
From the following article:
Experience-dependent representation of visual categories in parietal cortex
David J. Freedman and John A. Assad
Nature 443, 85-88(7 September 2006)
doi:10.1038/nature05078
a, Monkeys grouped 12 motion directions into two categories (the red and blue arrows) separated by a 'category boundary' (black dotted line). The green dotted line is the boundary used for retraining with the new categories. b, Delayed match-to-category (DMC) task. A sample stimulus was followed by a delay and test. If the sample and test were in the same category, monkeys were required to release a lever before the test disappeared. If the test was a non-match, there was a second delay followed by a match (which required a lever release). c, Monkeys' average DMC task performance across all recording sessions was greater than chance (50%) for sample stimuli that were close to (15°) and farther from (45° or 75°) the boundary. Error bars are s.e.m.