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II. P3 AND MEMORY
2. P3's main portion is not within the theta band. Rather, the main portion of P3 lies in sub-delta and delta. For example, P3 is virtually abolished with a high-pass setting at 1.0 Hz (Duncan-Johnson & Donchin, 1979) or of 2.0 Hz (Jodo & Kayama, 1992). The importance of the slow portion of P3, as well as the irrelevance of the faster bands, can also be recognized from the practice found in many laboratories of measuring P3's peak after severe low-pass filtering. For example, Donchin's group has often used a low-pass with -3db at 8 Hz (e.g., Fabiani & Donchin, 1995) implying a relevant attenuation of the theta band, and others have gone even further below, without any obvious loss of information (e.g., 3.5 Hz low-pass used by Pfefferbaum, Christensen, Ford & Kopell, 1986).
3. P3 is only loosely related to the hippocampus. As Klimesch (1995) correctly points out, integrity of the hippocampus is not necessary for P3 (e.g., Polich & Squire, 1993) even though there is activity within the hippocampus concurrent with, or shortly after P3, often larger than in other areas (Smith, Halgren, Sokolik, Baudena, Musolino, Liegois-Chauvel & Chauvel, 1990). Yet, what is necessary for P3 is integrity of the temporo-parietal junction (Knight, Scabini, Woods & Clayworth, 1989; Yamaguchi & Knight, 1991; Verleger, Heide, Butt & Koempf 1994; see also Molnar, 1994).
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