A DEVELOPMENT STUDY OF BRAIN WAVES AND SPONTANEOUS MOTOR ACTIVITY IN WHITE RATS

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Changes in a number of physiological and neuroanatomical measures with a most emphasis on the cortical EEG in relation to behavior were studied as a function of age in days after birth in white rats. Results confirmed most of the previous studies in that the cortical activity matured by 20-30 days after birth.<BR>One of the original findings was a sudden appearance of the highly rhythmic (almost completely sinusoidal) activity of 7-10 Hz from the frontal and occipital cortex around 5 days after birth, which was called characteristic rhythmic waves or CRW. CRW increased in frequency with increasing age but its amplitude was not correlated with age. However, during the same recordings, CRW was associated with respiratory cycle, and the direct recording from the olfactory bulb did yield CRW with the same frequency as that from the cortex in rats of various ages. Thus it was assumed that CRW is originated in the olfactory bulb and reflects olfactory function. CRW became less marked with age probably because of development of other cortical activities.<BR>Secondly, three different types of paradoxical sleep (PS) were identified. PS of adult type, characterized by theta activity, was first observed around 25 days after birth, when theta waves in association with gross body movement were first recorded. Theta waves were often superimposed with CRW whose frequency was identical to that of the CRW observed independently or directly from the olfactory bulb and this relationship was held even in adult rats.
公益社団法人日本心理学会の論文

A DEVELOPMENT STUDY OF BRAIN WAVES AND SPONTANEOUS MOTOR ACTIVITY IN WHITE RATS

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