Subject(s)
Auditory Perceptual Disorders/physiopathology , Cerebral Hemorrhage/physiopathology , Intracranial Arteriovenous Malformations/physiopathology , Music , Parietal Lobe/physiopathology , Temporal Lobe/physiopathology , Adult , Cerebral Hemorrhage/diagnosis , Cerebral Hemorrhage/surgery , Humans , Intracranial Arteriovenous Malformations/diagnosis , Intracranial Arteriovenous Malformations/surgery , Male , Neuropsychological Tests , Tomography, X-Ray ComputedABSTRACT
The causes of the spontaneous sharp amplitude variations of R3 component of electrically evoked blink reflex have been analyzed, in 10 subjects 24-30 years, in different experimental conditions: a) neutral condition, b) selective attention to the stimulus; distraction from the stimulus: c) by looking at a poster rich with images and d) by signaling from sequences of numbers three targets. In the situations where the subject does not play attention to the experimental set up, (a), or is distracted from it (c), the R3 response shows the maximal amplitude, whereas in condition of greater attention to the stimulus (b), R3 appears sharply reduced in amplitude. Where attentive levels are high but not focused on the stimulus (d), the reduction of the third reflex response is lesser. The reciprocal modifications with respect to the other responses R1 and R2 are also discussed.
Subject(s)
Attention/physiology , Blinking/physiology , Evoked Potentials/physiology , Trigeminal Nuclei/physiology , Adult , Electric Stimulation , Electromyography , Humans , Medulla Oblongata/physiology , Neural Pathways/physiology , Nociceptors/physiology , Photic Stimulation , Pons/physiology , Synapses/physiologyABSTRACT
A case of Gerstmann syndrome following a trauma is presented. After one month the patient showed the four symptoms of the Gerstmann syndrome associated with slight visual memory and constructional praxis deficits. Eight months later, however, he showed only dyscalculia, dysgraphia, right-left disorientation and finger agnosia, in accordance with selective damage of the left angular gyrus revealed by CT scan. The findings seems to support the existence and the localizing value of Gerstmann syndrome.
