Fig. 14.

Performance over the course of the epoch of a linear discriminant classifier trained to distinguish individual EEG epochs. The classifier in (a) was trained to discriminate shocks during experimenter touch versus self-touch, and the classifier in (b) was trained to discriminate left-hand shocks versus right-hand shocks. Chance performance in both cases is 0.5, and shaded areas indicate standard errors of the mean. Any above-chance classification performance indicates the availability of systematic information in the EEG at that timepoint discriminating the respective categories. The classifier is unable to distinguish self-touch from experimenter touch (a) but performs above chance when distinguishing left-hand from right-hand shocks, as expected (b). The spikes in classification performance at t = 0 in both panels reflect the classifier’s above-chance ability to discriminate whether the stimulus artefact was at either a self-touch or experimenter-touch location (a) or on the left or right middle finger (b)