Perception and estimation of time.

nouns or of photographs of faces. This difference in roles of the two hemispheres was to be tested by using right-handed and left-handed Ss. The results were negative, but also the hypotheses were weak. Does a recognition task not always involve the dominant hemisphere? By considering large groups of Ss having brain lesions in widely differing areas , and by subjecting them to a test battery (involving manipulation of temporal concepts estimating time periods , sequence of events , judging and producing short and long intervals singly and in pairs), Bruyer & Bontemps­ Devogel (1979) found that by comparison with a control group, the Ss with lesions showed a lower level of performance . The group with frontal lesions showed a marked disability. A final point to indicate, and it is merely a confIrmation, is that there is no relationship between the alpha rhythm and temporal estimations (Adam et al 1971) . However, Coffin & Ganz ( 1 977) found in the estimation of a 5 sec task a high correlation between the estima­ tions and the weighted mean frequency of the EEG close to the alpha fre­