Biomedical subjects

M Corsi-Cabrera

Publications and source records attributed to M Corsi-Cabrera.

12 recordsLinked to original sources

PubMed1992

EEG activity during estral cycle in the rat.

EEG activity was recorded from right and left parietal cortex in adult female rats daily during 6 days. Immediately after EEG recording vaginal smears were taken and were microscopically analyzed to determine the estral stage. Absolute and relative powers and interhemispheric correlation of EEG activity were calculated and compared between estral stages. Interhemispheric correlation was significantly lower during diestrous as compared to proestrous and estrous. Absolute and relative powers did not show significant differences between estral stages. Absolute powers of alpha1, alpha2, beta1 and beta2 bands were significantly higher at the right parietal cortex. Comparisons of the same EEG records with estral stages randomly grouped showed no significant differences for any of the EEG parameters. EEG activity is a sensitive tool to study functional changes related to the estral cycle.

Animals↗

PubMed1992

Changes in the waking EEG as a consequence of sleep and sleep deprivation.

Electroencephalographic (EEG) activity was monopolarly recorded during resting wakefulness in 10 volunteers under the following conditions: at night before going to sleep, at night before total sleep deprivation, in the morning after waking, in the morning after sleep deprivation and at night after having slept during the day. Absolute and relative power and inter- and intrahemispheric correlation were established. After diurnal and nocturnal sleep as compared to sleep deprivation, we obtained the following significant results: interhemispheric correlations were higher; intrahemispheric correlations were lower; absolute power of alpha 2, beta 1 and beta 2 was lower; and relative power of alpha 2 and beta 2 was lower. EEG changes as a consequence of sleep or lack of sleep are dependent on prior sleep and/or wakefulness and not on circadian phase. EEG activity during wakefulness is a sensitive parameter and a useful tool to assess the consequences of sleep on brain functional organization.

Adult↗

PubMed1991

Spatial ability in classic dancers and their perceptual style.

The relation between spatial ability (body orientation and body awareness) and field dependence/independence was assessed by measuring performance on the Embedded Figures Test and WISC or WAIS Block Design at four different training levels in classical ballet, beginners to advanced, and a control group with no training in ballet, gymnastics, or sports (n = 70). No significant correlation was found between perceptual style or Block Design performance and body orientation or body awareness at any of the four levels of training. No significant differences were observed between the advanced group and the control group. Training in a particular type of spatial skill such as orientation within surrounding space was not related to the skill required to manipulate an abstractly represented space.

Adolescent↗

PubMed1989

Effect of normal sleep and sleep deprivation on interhemispheric correlation during subsequent wakefulness in man.

EEG activity was recorded from the right and left central, temporal, parietal and occipital derivations in 10 volunteers under the following conditions: at night before going to sleep, at night before sleep deprivation, in the morning after waking, in the morning after sleep deprivation and in the morning 48 h after recovery. Interhemispheric correlation and relative power were calculated for EEG samples of 20.48 sec. In the morning after normal sleep interhemispheric correlations were higher in all derivations in comparison to presleep values, while in the morning after sleep deprivation, interhemispheric correlations were lower or similar to predeprivation values in all derivations except the temporal cortex. The relative power of beta was significantly lower after normal sleep and higher after sleep loss, while the relative power of low frequencies was higher in the morning after sleep and lower in the morning after deprivation.

Adult↗

PubMed1989

Correlation between EEG and cognitive abilities: sex differences.

EEG activity was recorded during rest in 9 male and 9 female volunteers, aged 23 and 27, from C3, C4, T3, T4, P3, P4, O1 and O2, referenced to the ipsilateral earlobe. In a separate session verbal, spatial and abstract reasoning subtests of the Differential Aptitude Test were administered. Samples of EEG activity of 20.48 s were analysed and the interhemispheric correlation was obtained. Interhemispheric correlation in the alpha band was significantly higher in women than in men at central, parietal and occipital derivations. Significant correlations were found between D.A.T. scores and interhemispheric correlation, positive for women with abstract and spatial aptitudes in the central cortex, and negative for men with spatial, abstract and verbal scores in most derivations recorded. The opposite sign of men and women's correlations suggests the existence of a different cerebral functional organization, women showing lower hemispheric differentiation than men.

Adult↗

PubMed1989

Does brain electrical activity react to music?

The electrical activity of the left and right central, temporal and parietal cortex was recorded in 14 amateurs of classical music during silence, pleasant (a piece of music) and unpleasant (a recording of an infant crying) stimulation. All the subjects rated the music as a pleasant stimulation and crying as an unpleasant one. Theta relative power was significantly higher while listening to music and lower during crying. Beta relative power did not change across conditions. No interhemispheric differences in the relative power were found. Interhemispheric correlation did not change either.

Adult↗

PubMed1988

Interhemispheric correlation of EEG activity during successful and unsuccessful cognitive performance.

EEG activity of eight male volunteers was monopolarly recorded at P3 and P4 during an initial baseline and during performance of three series of cognitive tasks: one verbal, one spatial and one "mixed" demanding verbal and spatial processing. Interhemispheric correlation of the EEG activity was compared among tasks and between successful and unsuccessful trials. There was a significant main effect for success or failure of cognitive processing with increased interhemispheric correlation during unsuccessful trials regardless of their nature. There was no main effect for tasks. Interhemispheric correlation proved to be sensitive to success or failure in information processing.

Adult↗

PubMed1988

EEG activity during performance of cognitive tasks demanding verbal and/or spatial processing.

EEG activity of 8 male volunteers was monopolarly recorded at P3 and P4 during four resting periods and during the performance of three series of cognitive tasks: one verbal, one spatial and one demanding verbal and spatial processing or "mixed" task. Beta, alpha and theta relative power were compared between successful and unsuccessful trials, between start and end of performance interval and among resting periods and tasks. There were no significant differences between successful and unsuccessful trials, nor between start and ending of performance period. The effect of tasks and hemispheres on relative power showed different results for each band: beta was responsive to hemispheres while alpha and theta were sensitive to tasks; beta relative power was significantly higher in the left parietal and the same pattern of asymmetry was maintained during the three series of tasks; alpha relative power decreased and theta increased significantly during the three series of tasks regardless of their cognitive nature as compared to baseline.

Adult↗

PubMed1986

Reduction in paradoxical sleep after L-dopa administration in rats.

The EEG and EMG activity of two groups of rats (N = 8 each) was recorded during one experimental and 5 control days. On the experimental day, one group received 125.0 mg/kg L-dopa preceded by 50.0 mg/kg benserazide hydrochloride. The other group received 1.0 mg/kg haloperidol, immediately before the recording session. After L-dopa plus benserazide administration the total time and the number of episodes of paradoxical sleep and slow wave sleep decreased significantly compared to control sessions.

Animals↗

PubMed1986

Dream content after using visual inverting prisms.

All night sleep electroencephalograms were recorded in 10 healthy adults for 2 nights. On the second night all subjects were requested to be at the laboratory 5 hr. before their usual bedtime and were submitted to the same routine for performance on several visuomotor tasks; experimental subjects were required to use visual inverting prisms upon their arrival and during the performance of the tasks. Subjects were awakened 10 min. after each paradoxical sleep episode for dream collection. Dream content was significantly affected by the use of the inverting prisms: the presleep tasks and day-time activities were more frequently incorporated into the dreams of the experimental subjects. The dreams of the experimental group were more active and vividness was evaluated as lower by them than by the control subjects.

Adaptation, Psychological↗

PubMed1985

Paradoxical sleep augmentation after imprinting in the domestic chick.

The EEG and EMG of two groups of chicks (Gallus domesticus), (an experimental one who was imprinted, and a control one who was not), were recorded during 3 hours before and 3 hours after imprinting. The fertilized eggs were kept in an incubator under controlled temperature and humidity until ecclosion occurred. The recording session began 10 hours after ecclosion and after two hours of habituation to the recording conditions. During the imprinting session, E group met a natural stuffed white hen moved by a slow motor. The total amount of time spent in paradoxical sleep (PS), as well as the number of PS episodes increased significantly following imprinting in the E group. Opposite results were found in C group: total amount and number of PS episodes decreased significantly after the pseudo-imprinting session. Neither slow wave sleep, nor wakefulness were modified.

Animals↗

PubMed1975

Caudate nucleus lesion selectively increases paradoxical sleep episodes in the rat.

The EMG, ECG and the behavioral activity of seven rats were recorded for three days previous to and 24 hours after lesioning both caudate-putamen complexes. Following the lesion, the paradoxical sleep stage lengthened by about 248%, without noticeable changes in the slow wave sleep or in the waking stages. The greatest increase was obtained with lesions placed in the mediomedial portion of the caudate-putamen complex. In other six rats submitted to the above procedure except that the lesions were placed in the anterior cerebral cortex, and also in five more rats implanted in both caudate-putamen complexes but not lesioned, no change was noted in the waking, paradoxical sleep or slow wave sleep stages.

Animals↗