Figure 6.

Classification performance with univariate analysis. A. The solid blue line shows the BOLD response averaged across all trials to right hand (RH) and left hand (LH) touch in the left hemisphere S2 of an individual subject in experiment 1. The duration of each response is 16 sec; the small black bar on the x‐axis shows the stimulus duration of 2 sec. B. Each blue symbol show the BOLD response in a single trial of right hand (RH) touch (left column of symbols) and left hand (LH) touch (right column) in left S2 (same subject as A). The solid black lines show the mean response to RH and LH touch. The optimal classification boundary is midway between the two means (dashed line). This boundary correctly classifies all RH trials above it and all LH trials below it (66%, green ellipses) and incorrectly classifies all RH trials below it and all LH trials above it (34%, red ellipses). C. The BOLD response, averaged across all trials, to thumb (D1), middle finger (D3), and pinky finger (D5) touch in the left hemisphere S2 of an individual subject in experiment 2. D. Individual trial responses (blue squares) and means (black lines) in S2 to single finger touch. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]