Figure 6.

Effect of BMI on orientation dependency of surround effect. An example of the surround-orientation test for the neuron shown in Figure 2. Patterned stimuli are composed of the CRF grating with optimal parameters and surround grating with the same parameters as those of the CRF grating, except for orientation. The stimulus contrast was 50%. A, PSTHs of responses before (Control) and during (BMI) BMI administration. B, Tuning curves for the control response (solid line) and response during BMI administration (dashed line) plotted against orientation difference between the CRF and surround gratings. Data are fitted by Equation 3. Error bars indicate ±1 SEM. CRF, CRF stimulation. C, Tuning curves normalized to the response to the CRF stimulation. Other conventions are the same as those in Figure 2.