Fig. 9.
Responses of an MT neuron to textured barber diamonds. a, Neuronal responses to circular gratings moved in each of eight directions. Gray dots indicate responses used to form intrinsic motion prediction. b, Responses to untextured barber diamonds. Mean responses corresponding to intrinsic motion prediction are replotted in gray. Mean responses to untextured barber diamonds are plotted inblack. Peristimulus time histograms illustrate observed responses to each of four barber-diamond conditions. As predicted, this cell responds significantly more (ANOVA; p < 0.0001) to conditions in which barber diamonds were configured to elicit a percept of upward motion rather than downward motion (Ri‖h = 0.87). c, Responses to textured barber diamonds. Arrows indicate typical perceived motion for humans when the same four barber-diamond conditions are superimposed with unambiguously moving texture. Responses of this cell no longer exhibited a significant (ANOVA;p = 0.56) motion–depth interaction, and the intrinsic motion prediction (Ri‖h) was 0.46. See also legend to Figure 4.