A Comparative Study on Human Cerebral Dominance by the Tsunoda Method and Auditory Evoked Potential (AEP)-method as a Cerebral Dominance Test

Abstract

The purpose of this study was to investigate the correlation between the Tsunoda Method and AEP-method as a cerebral dominance test. The cerebral dominance of normal Japanese and normal non-Japanese were compared far verbal, non-verbal sounds and some environmental sounds.
The subjects were 25 normal Japanese (16 males, 9 females) and 9 normal non-Japanese (6 males, 3 females).
The follawing results were obtained;
1) In the normal Japanese, the amplitudes of the evoked responses over the left temporal area T₃ were significantly greater than the right T₄ for the natural vowel /a/, the CV-syllable /ga/, chirping of crickets, sounds of rushing streams, moo of cow, Shinobue, Shakuhachi (bamboo flute) and Biwa (Japanese string instrument), and the right ones were significantly greater than the left for flute A note, violin A note, a pure tone 1010Hz and white noise.
2) In the normal non-Japanese, the amplitudes of the evoked responses over the left temporal area T₃ were significantly greater than the right T₄ for the CV-syllable /ga/, and the right ones were significantly greater than the left for the natural vowel /a/ and a pure tone of 1010Hz.
3) All the contra-normal subjects showed the exactly reversed pattern to the normal.
4) The above results of Japanese and non-Japanese showed a perfect agreement with those of the Tsunoda Method in each case.