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English to Russian translations [PRO] Medical - Psychology
English term or phrase:percentile distribution
Kamiya (personal communication) suggested to me that a half second was too short for subjects to discriminate from the background variability. Therefore, we attempted to demonstrate alpha state discrimination using one-, two- and four second intervals. With the approval of the University of Minnesota Institutional Review Board, we studied 22 participants, age 18-55. A 150-second eyes-closed baseline EEG was recorded at frontal (F3 or Fz) or posterior locations (Pz, O1, or O2) with a linked ears reference. Each epoch was ranked among a percentile distribution of alpha powers of the most recent 150 seconds initially derived from the baseline recording.