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A: Scalp EEG recordings of interictal spikes. Reprinted with permission from Prog Neurobiol (1). Copyright Elsevier Science Ltd. 2001. B: One of the earliest examples of an intracellularly recorded paroxsysmal depolarization shift in an “acute penicillin focus” in the cat cortex. Upper superimposed tracing shows the field response recorded at the cortical surface. Adapted with permission from Exp Neurol (2). Copyright Elsevier Science (USA) 1964.
