Accession Number : ADA261592


Title :   Duration of Alpha Suppression Increases With Angle in a Mental Rotation Task


Descriptive Note : Rept. for 1 Feb 1992-14 Feb 1993


Corporate Author : NEW YORK UNIV NY


Personal Author(s) : Michel, C M ; Kaufman, L ; Williamson, S J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a261592.pdf


Report Date : 01 Feb 1993


Pagination or Media Count : 27


Abstract : Magnetic and electric recordings of average power within the restricted alpha band (10-12 Hz) were made over the parietal and occipital - areas of the human scalp while subjects were engaged in the mental imagery task of comparing an object with one previously seen but rotated and perhaps also mirror reflected. Alpha power was found to be suppressed while the subjects were engaged in the comparison, and the duration of suppression increased with the minimum rotation angle to achieve a match. This is additional evidence that visual cortex is engaged in the process of mental imagery. Moreover, for large rotation angles, where the task is markedly more difficult, a shift in the spatial pattern of suppression indicates that the left parietal area of the cortex becomes involved....Brain waves, Alpha waves.


Descriptors :   *COGNITION , *INFORMATION PROCESSING , *VISUAL CORTEX , *ELECTROENCEPHALOGRAPHY , MIRRORS , ANGLES , PATTERNS , ROTATION , SUPPRESSION , POWER , HUMANS , COMPARISON


Subject Categories : Psychology
      Anatomy and Physiology
      Medicine and Medical Research


Distribution Statement : APPROVED FOR PUBLIC RELEASE