Figure 4.

Comparison of depth-sign selectivity and depth preferences between the MP and BD conditions. A, The DSDI for the BD condition (ordinate) is plotted against the DSDI value for the MP condition (abscissa) for each neuron in our sample (N = 134). Filled black symbols indicate DSDI values that are significantly different from zero (p < 0.05, permutation test) in both the MP and BD conditions. Filled red symbols indicate DSDI values that are significantly different from zero in the MP condition, but not in the BD condition. Open black circles indicate DSDI values that are significantly different from zero in the BD condition, but not in the MP condition. Finally, open red circles indicate DSDI values that are not significantly different from zero in either the BD or MP conditions. Cells with near-horizontal direction preferences (within 30 degrees of the horizontal meridian) are represented by triangles (N = 39) while all other cells are represented by circles. B, Scatter plot showing the preferred depth for the BD condition plotted against that for the MP condition. Data are shown for all neurons with significant depth tuning (ANOVA, p < 0.05) in both the MP and BD conditions (N = 52). Symbol colors indicate congruent (blue, N = 31), opposite (orange, N = 13), and unclassified (gray, N = 8) cells. Cells with near-horizontal direction preferences are again represented by triangles while all other cells are represented by circles. Marginal histograms show distributions of depth preferences for congruent, opposite, and unclassified neurons.