Examples of stimuli are presented in Fig. 1. Categoryrelevant features always appeared in the same spatial location.
Stimuli were displayed on the computer screen,
subtending approximately 11 of visual angle horizontally and approximately 11 vertically.
As shown in Fig. 1B,
training stimuli were presented centrally,
one at a time, whereas testing stimuli were presented in pairs, side by side,
each with eccentricity of approximately 7.7 of horizontal visual angle.