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Event-related potentials in response to frequent and rare tones obtained on day 12. ERP components N1 and P2 are present in response to both ‘frequent’ and ‘rare’ tones. A wide positivity (in the 300 to 500 ms range) was also recorded at Cz and Pz in response to rare tones. This is very likely to correspond to a “P3b-like” component. Sensitivity: 10μV/div; sweep time: 100 ms/div.
