Somatosensory Cortex

Publication Title: 
The American Journal of Psychiatry

Effects of hypnotic alterations of perception on amplitude of somatosensory event-related potentials were studied in 10 highly hypnotizable subjects and 10 subjects with low hypnotizability. The highly hypnotizable individuals showed significant decreases in amplitude of the P100 and P300 waveform components during a hypnotic hallucination that blocked perception of the stimulus. When hypnosis was used to intensify attention to the stimulus, there was an increase in P100 amplitude.

Author(s): 
Spiegel, D.
Bierre, P.
Rootenberg, J.
Publication Title: 
Neuroscience and Behavioral Physiology

The influence of the state of "animal hypnosis" in rabbits on the course and preservation of the motor polarizational dominant created by the action of a direct current anode on the region of the sensorimotor cortex was investigated. The mechanogram of both forelimbs was recorded. It was demonstrated that the state of "animal hypnosis" induced against the background of the optimum of the dominant inhibits the motor reaction of the "dominant" limb to sensory test stimuli. This inhibition is maintained for a long time, up to two to four days.

Author(s): 
Rusinova, E. V.
Publication Title: 
Zhurnal Vysshe? Nervno? Deiatelnosti Imeni I P Pavlova

The electrical activity of the left and right sensorimotor cortex and left and right dorsal hippocampus (CA3 fields) was recorded during "animal hypnosis" in rabbits. The "animal hypnosis" produced asymmetry in the spectral power of the hippocampal electrical activity due to an increase in the power of delta 1, delta 2, and theta 1 components in the left-hippocampus and decrease in the spectral power in the same ranges in the right-hippocampus.

Author(s): 
Rusinova, E. V.
Roshchina, G. Ia
Publication Title: 
Journal of Neurophysiology

It is well accepted that pain is a multidimensional experience, but little is known of how the brain represents these dimensions. We used positron emission tomography (PET) to indirectly measure pain-evoked cerebral activity before and after hypnotic suggestions were given to modulate the perceived intensity of a painful stimulus. These techniques were similar to those of a previous study in which we gave suggestions to modulate the perceived unpleasantness of a noxious stimulus.

Author(s): 
Hofbauer, R. K.
Rainville, P.
Duncan, G. H.
Bushnell, M. C.
Publication Title: 
Annals of the New York Academy of Sciences

The study of pain may be relevant to the study of chemical intolerance (CI) in many ways. Pain is often reported as a symptom of CI and it is defined as a subjective experience similar to many other symptoms of CI, making its objectification difficult. Furthermore, the CNS plastic changes that underlie the development of persistent pain states and abnormal pain responses may share some similarities with those involved in the sensitization to environmental chemicals.

Author(s): 
Rainville, P.
Bushnell, M. C.
Duncan, G. H.
Publication Title: 
Zhurnal Vysshe? Nervno? Deiatelnosti Imeni I P Pavlova

Multiunit activity was recorded in left and right sensorimotor cortex of rabbits in the state of tonic immobility. After the first immobilization session, the discharge frequency changed in 47% cells in the right hemisphere: 30% decreased their frequency, and 17% increased. In the left hemisphere, only 18% cells changed their discharge frequency (13% decreased and 5% increased). Reciprocal changes in discharge frequency could be observed in the neighboring neurons (recorded by the same electrode).

Author(s): 
Bogdanov, A. V.
Galashina, A. G.
Publication Title: 
Zhurnal Vysshe? Nervno? Deiatelnosti Imeni I P Pavlova

A stationary excitation focus produced in the sensorimotor cortex of a rabbit by rhythmic electrodermal paw stimulation was manifested in the reaction to a testing sound stimulus earlier indifferent for the animal. Regardless of the stimulated paw (left or right), reactions to the testing stimuli appeared approximately in the equal percent of cases (70.7% and 71.5%, respectively).

Author(s): 
Pavlygina, R. A.
Galashina, A. G.
Bogdanov, A. V.
Publication Title: 
Neuroscience and Behavioral Physiology

Multineuron activity was recorded from the sensorimotor cortex of the right and left hemispheres during immobilization catatonia in rabbits. The first session of immobilization of the animals was followed by changes in spike frequency in 47% of neurons in the sensorimotor cortex of the right hemisphere. Of these, 30% showed decreases in spike frequency and 17% showed increases. Spike frequency in the sensorimotor cortex of the left hemisphere changed in only 18% of cells, of which 13% showed decreases in spike frequency and 5% showed increases.

Author(s): 
Bogdanov, A. V.
Galashina, A. G.
Publication Title: 
Zhurnal Vysshe? Nervno? Deiatelnosti Imeni I P Pavlova

Relations between activities of neurons simultaneously recorded in the left and right sensorimotor brain cortices of rabbits were analyzed in a series of experiments before the induction of the immobilization state ("animal hypnosis"), in the state of immobilization, and after its termination. The total baseline percent of significant correlations between activities of neighboring (within 50 microns) neurons in the left hemisphere was significantly lower than in the right hemisphere.

Author(s): 
Bogdanov, A. V.
Galashina, A. G.
Publication Title: 
Archives Italiennes De Biologie

The aim of the experiment was to study whether the activity of the primary sensory-motor (S1/M1), supplementary motor (SMA) and pre-motor (PMA) areas during fingers movement is modulated by hypnotic susceptibility and hypnosis. Cortical activity was studied through functional Magnetic Resonance Imaging (fMRI) during a finger-to-thumb opposition task in awake (Highs) and hypnotized highly susceptible (H-Highs) as well as in awake non susceptible subjects (Lows).

Author(s): 
Gemignani, A.
Tosetti, M.
Montanaro, D.
Biagi, L.
Ghelarducci, B.
Guazzelli, M.
Santarcangelo, E. L.

Pages

Subscribe to RSS - Somatosensory Cortex