Figure 5

Comparison of averaged normalized absorbance values (n = 5) evoked under 3 different stimulus conditions. Values were normalized to those obtained from the contralateral stimulus condition (thus, standard error bar for the contralateral condition is zero) and were obtained at 5 sec after stimulus onset of a 5 sec flutter stimulus. The contralateral stimulus evoked the greatest change in absorbance, while the ipsilateral stimulus evoked the weakest. The bilateral stimulus evoked a cortical response that was less than the response evoked by the contralateral stimulus. Analysis of variance showed that, at a 99% confidence interval, the ratio of the bilateral response evoked to the contralateral response evoked in SI was between 0.51 and 0.92.