期刊
JOURNAL OF NEUROSCIENCE
卷 37, 期 9, 页码 2325-2335出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.2266-16.2016
关键词
entrainment; local field potential; motion adaptation; motion after effect; neural mechanisms; transcranial alternating current stimulation
资金
- Army Research Office [W911NF-14-1-0408]
- National Institute of Mental Health, National Institute of Neurological Disorders and Stroke [R01MH111766]
- Eye Institute of the National Institutes of Health [R01EY017605]
- Charles and Johanna Busch Memorial Fund at Rutgers, State University of New Jersey
We previously showed that brief application of 2 mA (peak-to-peak) transcranial currents alternating at 10 Hz significantly reduces motion adaptation in humans. This is but one of many behavioral studies showing that weak currents applied to the scalp modulate neural processing. Transcranial stimulation has been shown to improve perception, learning, and a range of clinical symptoms. Few studies, however, have measured the neural consequences of transcranial current stimulation. Wecapitalized on the strong link between motion perception and neural activity in the middle temporal (MT) area of the macaque monkey to study the neural mechanisms that underlie the behavioral consequences of transcranial alternating current stimulation. First, we observed that 2 mA currents generated substantial intracranial fields, which were much stronger in the stimulated hemisphere (0.12 V/m) than on the opposite side of the brain (0.03 V/m). Second, we found that brief application of transcranial alternating current stimulation at 10 Hz reduced spike-frequency adaptation of MT neurons and led to a broadband increase in the power spectrum of local field potentials. Together, these findings provide a direct demonstration that weak electric fields applied to the scalp significantly affect neural processing in the primate brain and that this includes a hitherto unknown mechanism that attenuates sensory adaptation.
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