Table 1.
Basic information about the eight chimpanzees.
Fig 1.
Schematic diagram of the dot-probe task.
(A) Experiment: Chimpanzee ‘Ai’ participating in the threatening face experiment. (B) Congruent trial: dot replaces threatening face. (C) Incongruent trial: dot replaces neutral face. Response times (ms) to touch the dot were recorded.
Fig 2.
Mean response times (ms) for congruent and incongruent trials in (A) colour, (B) object, and (C) primate face experiments. Error bars indicate the standard error of the mean.
Fig 3.
Mean response times (ms) for congruent and incongruent trials in the threatening face experiment.
Error bars indicate the standard error of the mean.
Fig 4.
Mean response times (ms) for congruent and incongruent trials in the first session of the threatening face experiment.
Error bars indicate the standard error of the mean.