Figure 5. Build-up in anticipatory head and gaze activity with repeated presentation of an intermittently illuminated target moving at 32 deg s⁻¹ (experiment 2).

Mean of 9 subjects in both TOG (A and B) and OPP (C and D) conditions. The response to the 1st, 2nd, 3rd and 4th presentation of the target is plotted along with the steady-state response (the mean of responses to presentation 5 onwards). A non-zero target velocity signal denotes the time for which the target was visible.