Tây bán cầu khác biệt trong cả hai điều kiện thôi miên và nonhypnotic. Mức cao đã signi ® cantly nhanh hơn so với mức thấp trong việc nhận ra tức giận và hạnh phúc ảnh hưởng đến sự phân biệt đối xử của khuôn mặt trình bày các hình ảnh bên trái | NEUROPSYCHOPHYSIOLOGY OF HYPNOSIS 65 EEG hemispheric differences in both hypnotic and nonhypnotic conditions. Highs were significantly faster than lows in recognizing angry and happy affect in the discrimination of faces presented to the left or right visual field Crawford Kapelis Harrison 1995 . For highs only angry faces WCI C identified faster when presented to the right left visual field than left right visual field hemispheres while lows showed no significant asymmetries. During self-generated happy and sad emotions in hypnosis and nonhypnosis conditions in comparison to lows highs showed significantly greater hemispheric asymmetries greater right than left in the parietal region in high theta high alpha and beta activity between 16 and 25 Hz all frequency bands that are associated with sustained attentional processing Crawford Clarke Kitner-Triolo 1996 . Taken together these too studies suggest that highs have more focused and sustained attention Greater right parietal activity as indicated by faster reaction times and more EEG activity is suggestive of greater emotional arousal . Heller 1993 and or sustained attention among the highs. FRONTAL LOBE ACTIVITY AND HYPNOTIZABILITY Our work suggests that highly hypnotizable persons have more effective and flexible frontal attentional and inhibitory systems Crawford 1994a b Crawford Brown Moon 1993 Crawford Gruzelier 1992 Gruzelier Warren 1993 . Consistent with the above discussed research showing a relationship between hypnotizability and sustained attentional processing an intriguing neurochemical study by Spiegel and King 1992 suggests that frontal lobe activation is related to hypnotizability hl 26 male psychiatric inpatients and 7 normal male controls levels of the dopamine metabolite homovanillic acid were assessed in the cerebrospinal fluid. While preliminary in nature the results suggested that dopamine activity possibly involving the frontal lobes was necessary for hypnotic concentration. Gruzelier and
