FIG. 3. Temporal responses to a plaid pattern and its component gratings for 6 representative neurons. Temporal response profiles to the optimal, mask-only, and plaid stimuli are shown by thin, gray dotted, and thick curves, respectively. The suppression time course, the difference between the optimal and the plaid responses, is also plotted by dotted curve. *A*: simple cell in area 17. The orientation and spatial frequency of the optimal stimulus is 142° and 0.22 cycle/deg, respectively. The orientation and spatial frequency of the mask stimulus is 222° and 0.18 cycle/deg, respectively. *B*: complex cell in area 17. Parameters for the optimal stimulus: 69° and 0.77 cycle/deg. Parameters for the mask stimulus: 169° and 0.65 cycle/deg. *C*: simple cell in area 18. Parameters for the optimal stimulus: 150° and 0.13 cycle/deg. Parameters for the mask stimulus: 230° and 0.12 cycle/deg. *D*: complex cell in area 17. This neuron is the same as Fig. 2*B*. Parameters for the optimal stimulus: 163° and 0.33 cycle/deg. Parameters for the mask stimulus: 243° and 0.34 cycle/deg. *E*: complex cell in area 17. Parameters for the optimal stimulus: 170° and 0.40 cycle/deg. Parameters for the mask stimulus: 250°, and 0.31 cycle/deg. *F*: simple cell in area 17. Parameters for the optimal stimulus: 210° and 0.80 cycle/deg. Parameters for the mask stimulus: 290° and 0.87 cycle/deg.