Figure 4. Accuracy of CSS model and linear model for broadband and stimulus-locked ECoG data.

ECoG broadband responses (panel a) and stimulus-locked responses (panel b) were fit to the CSS model and a linear model. Accuracy was assessed by cross-validation. For each subject, experiments were conducted with 3 different bar widths. The models were fit to data from two of the experiments and then tested against the data from the left-out experiment. Plots show the variance explained for the left-out data, with each point corresponding to one electrode. For broadband responses, nearly every electrode was more accurately predicted by the CSS model than the linear model (data points above the identity line). For stimulus-locked responses, the two types of models were equally accurate. The pattern of broadband model fits (greater accuracy for CSS model) is similar to fMRI data (Figure S4). Variance explained of less than 0 was coded as 0.