Figure 6.

Combined condition responses are well approximated by linear weighted summation. A, Predicted responses from weighted linear summation are strongly correlated with measured responses under the combined condition (r = 0.99, p ≪ 0.001). Each symbol represents the response of one neuron at one heading angle (after spontaneous activity is subtracted). Cyan, magenta, and black symbols are used for congruent (n = 36), opposite (n = 5), and intermediate (n = 15) neurons, respectively. B, Distribution of correlation coefficients from the linear regression fits. Three cases with negative (but not significant) R² values are not shown. C, Visual and vestibular weights derived from the best fit of the linear weighted sum model for each neuron with significant R² values (black bars in B). Arrowheads illustrate mean values. Solid line shows linear regression. Circles, monkey U; triangles, monkey C.