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Based on high-resolution diffusion tensor magnetic resonance imaging (DTI) tractographic analyses in 39 healthy adult subjects, we derived patterns of connections and measures of volume and biophysical parameters, such as fractional anisotropy (FA) for the human middle longitudinal fascicle (MdLF). Compared to previous studies, we found that the cortical… (More)
We investigated the mechanism of two evoked cardiac response components associated with different aspects of information processing. Innocuous stimuli presented in an irrelevant condition elicit a simple cardiac deceleration termed ECR1. The same stimuli presented in a relevant condition (such as results from requesting subjects to silently count the… (More)
The influence of two anxiolytics on basal heart rate and on the evoked cardiac response elicited by auditory stimuli, was studied in humans. Diazepam (Valium) (7.5 mg) and buspirone (Buspar) (7.5 mg), which differ in their psycho-pharmacological profiles, were used. Prestimulus vigilance and cognitive load were manipulated by instructions allowing the… (More)
Effects of paradoxical sleep deprivation upon intracranial self-stimulation behavior were studied. After stable response rates to electrical brain reward were obtained, rats were assigned to an experimental group in which they were deprived of paradoxical sleep with the pendulum technique for 72 h, to a pendulum control group and to a home-cage control… (More)
Transconjunctival approach to a large cavernoma of the orbit. Is there a difference in cognitive deficits after aneurysmal subarachnoid haemorrhage and subarachnoid haemorrhage of unknown origin?. Dynamic Magnetic Resonance Imaging of the contralateral testis in patients with malignant tumor of the testis. The extreme lateral transcondylar approach to… (More)
24 students, after intake of diazepam or placebo, performed a psychomotor test of finger tapping as a prospective time-estimation task. The task was less overestimated by those who were under the influence of the drug than by the 12 subjects to whom the placebo was given.
We report research on different phasic evoked cardiac responses associated with differences in cognitive activity. These were examined in relation to a stable individual difference variable, mean simple reaction time (RT). Individual means on RT were found to be sufficiently stable over a 10 month period to consider them as individual functional… (More)
30 students, when performing a task that required listening to 19 sentences for 150 sec., overestimated the duration of the task less in the prospective condition than in the retrospective one (46 sec. vs 85 sec.).