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Cortical evoked responses to magnetic stimulation of macaque's abdominal wall in sleep-wake cycle

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Pigarev I. N., Almirall H., Pigareva M. L.
Acta Neurobiologiae Experimentalis
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2008
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vol. 68
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issue 1
91-96
EN
EEG and eye movements (magnetic search coil method) were recorded in sleep and wakefulness in a monkey (Macaca fascicularis) while the animal was sitting in a primate chair. Single pulse magnetic stimulation was applied to the monkey's abdominal wall using a circular coil and a Magstim 200 stimulator. Magnetic stimuli did not wake the sleeping animal, and being applied during slow wave sleep evoked clear responses in EEG with a latency of 80?100 ms. These responses disappeared during wakefulness and rapid eye movement sleep. Control experiments confirmed that these responses were not caused by the acoustic clicks produced by the magnetic coil. Results of this study further confirm that during sleep, signals from visceral organs reach the cortical areas which in wakefulness process exteroceptive sensory information. This observation indicates that magnetic stimulation may be a useful tool for researching neural connectivity reorganization within the sleep-wake cycle.
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Visceral signals reach visual cortex during slow wave sleep. Study in monkeys

76%
Pigarev I., Almirall H., Pigareva M. L., Bautista V., Sanchez-Bahillo A., Barcia C., Trinidad H. M.
Acta Neurobiologiae Experimentalis
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2006
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vol. 66
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issue 1
69-73
EN
Propagation of signals from the gastro-intestinal system towards the occipital cortex within sleep-wake cycle was investigated in three monkeys used in the study of sleep impairment in a chronic MPTP model of Parkinsonism. The monkeys differed in motor abilities and sleep structure. One animal (M1) was non-motor disabled and had no sleep alterations. The other two monkeys were severely motor affected, but one (M2) had normal sleep cycles; meanwhile, the other (M3) had no complete sleep cycles. To evaluate the level of sleep and to record cortical evoked responses screw electrodes were implanted over the occipital cortex. Two hours before overnight recordings, two hook electrodes were injected intraperitoneally (under light Ketanest anesthesia) and anchored in gut. Using these electrodes, electric stimulation was applied during slow wave sleep, and in wakefulness. Cortical evoked responses to intraperitoneal stimulation were found indeed during sleep in experiments with M1 and M2. These results show that also in primates with normal sleep pattern visceral information is transferred to the cerebral cortex during slow wave sleep.
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