Figure 1: Behavioural protocol.
From: Abstract rule neurons in the endbrain support intelligent behaviour in corvid songbirds
The birds initiated a trial by moving their heads in front of the screen during presentation of the go-stimulus. A sample stimulus was presented for 500 ms, followed by a 1,000 ms delay. A rule cue (either auditory or visual) instructed the bird about the current rule (‘match/nonmatch’), followed by a second 1,000 ms delay. In the choice period, crows pecked either at the image identical to or different from the sample, according to the previously indicated rule, to receive a reward. All relevant task parameters were balanced.
