2006 Fiscal Year Final Research Report Summary
Study of the relationship between the Lambda-like response and the generation of dream imageries.
| Project/Area Number |
17605008
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
睡眠学
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
HORI Tadao Hiroshima University, Graduate School of Integrated Arts and Sciences, Professor, 大学院総合科学研究科, 教授 (10020132)
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| Project Period (FY) |
2005 – 2006
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| Keywords | hypnagogic period / NREM sleep / sleep stage 2 / REM sleep / dream imagery / visual imagery / POSTS / POSTS |
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| Research Abstract |
The relationship between the positive occipital sharp wave transients and the generation of visual imageries were investigated for hypnagogic period, NREM sleep period and REM sleep period.
In 2005, the positive sharp wave (P400) to tone stimuli was studied for hypnagogic state and REM sleep period. The P400 appears at occipital region and is expected having a role in the generation of dream imagery. However, the amplitude of P400 was decreased when a hyapnagogic imagery or REM sleep dreaming appeared. Therefore we concluded that the appearance of P400 had not a role in the generation of dream imageries. On the other hand, the Lambda-like positive sharp waves appeared immediately after the termination of REM. By using a 3D current density analysis (sLORETA), the sources of current density of the Lambda-like positive sharp waves were identified at the Cuneus and Lingual gyrus in the occipital lobe. We discussed the psychophysiological meaning of the Lambda-like positive sharp waves and concluded that these activities was closely related the generation of visual imageries of dream in REM sleep.
In 2006, the POSTS ( positive occipital sharp transients of sleep) during NREM sleep stage 2 were studied. By using a 3D current density analysis (sLORETA), the sources of this activities were identified at the Cuneus and Lingual gyrus in the occipital lobe. Since the results were very similar to the origin of Lambda-like positive sharp waves, we concluded that the appearance of POSTS was closely related the generation of dream imageries during NREM sleep.
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