Abstract:
:Simultaneous recordings of cortical activity, recorded as the cortical local field potential (CLFP) in the contralateral posterior sigmoid gyrus, and the spinal activity, recorded as the cord dorsum potential (CDP) of the L6 lumbar segment, were made in the anaesthetized cat. The electrodes were positioned in somatosensory regions where the largest spontaneous negative CLFPs and CDPs were recorded. We found that spontaneous negative CLFPs were preceded by spontaneous negative CDPs with a mean latency of 14.4+/-3.5 ms. Amplitude of these spontaneous negative CLFPs was abolished after section of the dorsal columns and ipsilateral dorsolateral funiculus. It is concluded that the neurones of the primary somatosensory cortex can be driven by dorsal horn spinal neurones producing the spontaneous negative CDPs. This suggests very strongly that spontaneous neuronal activity in somatosensory regions of the brain is generated not only by ongoing activity of neurones located at supraspinal sites, but also by ongoing activity of spinal neurones.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Manjarrez E,Rojas-Piloni G,Vazquez D,Flores Adoi
10.1016/s0304-3940(01)02497-1keywords:
subject
Has Abstractpub_date
2002-02-01 00:00:00pages
145-8issue
3eissn
0304-3940issn
1872-7972pii
S0304394001024971journal_volume
318pub_type
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