Figure 1.

A, Examples of posture representations in the model. Each posture-selective neuron represents a single posture (the stick figures) from a 2D view of an action, in this case walking. Top row, Examples of postures during the walking cycle seen in profile view (0° facing direction). Bottom row, Similar examples in half-profile view (45° facing direction). B, In the template-matching step, a stimulus posture is spatially compared with all templates, and the degree of overlap determines the activity of the respective template neuron. C, When a continuous walking stimulus is presented, it will excite each of the neurons from that particular facing direction in order. At each point in time, the walking stimulus has a slightly different posture for which one of the posture-selective neurons is most responsive. As the posture of the stimulus changes because of the movement, the highest posture-selective neuron response shifts from one posture-selective neuron to the next. This results in an oriented activation profile in the posture–time plot. D, When the stimulus is shown in reversed order (backwards walking), the posturo-temporal activation is oriented in the orthogonal direction.