Normal Eeg and Its Development in the White Rat

Yoshii, Naosaburô; Tsukiyama, Kazuo

doi:10.2170/jjphysiol.2.34

Cited by 30 publications

(5 citation statements)

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“…These small and rapid waves could be observed unequivocally on records written with a paper speed of 3 cm per second. An artefact seems unlikely since the rats served as their own controls and the preoperative records were comparable to reports in the literature [37,4]. The observed electrocorticographic picture may be speciesspecific and needs further investigation.…”

Section: Discussionsupporting

confidence: 63%

The Eck Fistula Rat: Definition of an Experimental Model*^,**

Herz

Sautter

Robert

et al. 1972

Eur J Clin Investigation

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Fifty‐nine male Sprague‐Dawley rata were subjected to an end‐to‐side portacaval shunt and compared with appropriate controls. During the first ten days after the operation, the liver weights decreased from an average of 4.2 to 2.3% of the body weight and thereafter remained at this level. Testicular atrophy also occurred regularly but only after the tenth postoperative day. Three weeks after the operation, the body weight of shunted rats had decreased by an average of 20%, whereas sham operated controls gained 17%. These changes were related to food intake and coprophagy. Hyper‐ammonaemia developed gradually and levelled off at about 500 (μg/100 ml. Other alterations were more variable in severity. Spontaneous motor activity decreased to 12–77% of the preoperative value and was significantly correlated with changes in body weight. The electrocorticographic pattern was characterized by an average increase in rapid waves to 205% after five to six weeks, whereas the slow waves remained unchanged. These studies have established a standard of reference for further investigations with this animal model.

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Section: Discussionsupporting

confidence: 63%

The Eck Fistula Rat: Definition of an Experimental Model*^,**

Herz

Sautter

Robert

et al. 1972

Eur J Clin Investigation

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“…Normal EEG of white rat consists of regular 7-10 (6-12) per second waves (basic waves) and superimposed less regular 16-20 or more per sec. waves (small fast waves), as has been reported previously (9). EEG-changes resulting from enforced swimming were characterized by suppression of the basic waves and increase in the small fast waves (that is, increase in average frequency per sec.…”

Section: Resultssupporting

confidence: 68%

Electroencephalographic Studies on Fatigue Induced by Enforced Swimming in the White Rat

1952

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Gruttner and Bankalo (1), Motokawa, Mita and Tsujiguchi (2) reported electroencephalographic studies on mental fatigue, but did not study brain fatigue after somatic work. Changes in reflex function after several types of athletic sports (3, 4) and brain fatigue after somatic and mental work (5, 6, 7, 8) were examined in our laboratory. In this paper, the electroencephalographic changes were studied in fatigued rats by enforced swimming with a view to find the cerebral function in somatically fatigued state. METHODS Thirteen adult rats (100-200 g. in body weight) were forced to swim in C.), until the rats were fatigued enough to the point of drowning. EEG's were lead off bipolarly from the two electrodes previously inserted under the skull and fixed on the parietal and occipital cortices respectively, and recorded by a four stage resistance-capacity coupled amplifier (0.2 sec. time constant) and an electromagnetic oscillograph. Each experiment was carried out several days after the operation of insertion of the electrodes (9).

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“…The onset of EEG development in the rat (i.e., when the EEG first becomes "visible" in the record) has been reported at different ages, varying from the 1st t o the 6th postnatal day (Blozovski, 1963;Crain, 1952;Deza & Eidelberg, 1967;Myslivecek, 1959;Radouco-Thomas, Martin, Chaumontet, & Royo, 1961 ;Schwartze, 1966;Tuge, Kanayama, & Chang, 1960;Yoshii & Tsukiyama, 1951). However, these investigations were carried out on acute animal preparations, thus preventing the study of the development of EEG patterns related to specific behavioral states.…”

Section: Gramsbergenmentioning

confidence: 99%

The development of the EEG in the rat

Gramsbergen

1976

Developmental Psychobiology

116

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The development of the electroencephalogram (EEG) and, especially, behavioral state-specific EEG patterns was studied in white and black hooded rats of the Lister strain, aged 9-30 days. Movements of the rat were recorded and the behavioral state was monitored by means of a push-button device. The EEG was collected when the rat was in State 1 (regular respiration, absence of movements, and, after the 14th day when the rat eye opens, eyes closed), State 2 (irregular respiration, continual occurrence of twitches, and, after the 14th day, eyes closed), and in State 4 (irregular respiration, presence of gross body movements, and, after the 14th day, eyes opened). The EEG of rats on the 9th and 10th day did not reveal behavioral state-specific patterns. The amplitudes of the EEG were low and only low frequencies occurred. Between the 10th and 13th day an EEG pattern specific for State 1 containing high amplitudes developed. From the 14th day onwards spindles (frequencies from 14-18 Hz) occurred in the EEG during State 1. From the 14th day onwards, the EEG from the visual cortex during State 2 showed a regular and continually occurring 5-Hz rhythm. Bursts with 5-Hz waves were recorded from the visual cortex only intermittently during State 4. The EEG frequencies during the bursts varied between 5 and 7 Hz from the 17th day onwards. Computer analysis of the amplitude distributions showed a considerable increase in the power after the 10th day. The analysis of the frequency spectra indicated that the power increase occurs expecially in the higher frequencies of the EEG signal. Visual analysis as well as computer analysis of the EEG did not reveal systematic changes in the EEG after the 18th day when the EEG was similar to that recorded at older ages.

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Normal Eeg and Its Development in the White Rat

Cited by 30 publications

References 0 publications

The Eck Fistula Rat: Definition of an Experimental Model*^,**

The Eck Fistula Rat: Definition of an Experimental Model*^,**

Electroencephalographic Studies on Fatigue Induced by Enforced Swimming in the White Rat

The development of the EEG in the rat

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Normal Eeg and Its Development in the White Rat

Cited by 30 publications

References 0 publications

The Eck Fistula Rat: Definition of an Experimental Model*,**

The Eck Fistula Rat: Definition of an Experimental Model*,**

Electroencephalographic Studies on Fatigue Induced by Enforced Swimming in the White Rat

The development of the EEG in the rat

Contact Info

Product

Resources

About

The Eck Fistula Rat: Definition of an Experimental Model*^,**

The Eck Fistula Rat: Definition of an Experimental Model*^,**