Synchronous firing in the second somatosensory cortex (SII) covaries with the attentional state of alert monkey. Steinmetz, P. N., Roy, A., Fitzgerald, P., Hsiao, S. S., Niebur, E., & Johnson, K. O. Soc. Neurosci. Abstr., 28:1513, November, 1998. abstract bibtex The degree of correlated activity of pairs of neurons recorded simultaneously in area SII of an alert behaving monkey was examined. During the recordings, the animal's focus of attention switched between performing a tactile discrimination task, where the animal was required to match the orientations of two sequentially presented bars pressed onto the monkey's fingerpad, and performing a visual task, where the animal was required to detect the dimming of a figure presented on a screen while receiving identical tactile stimulation (see Fitzgerald, Lane and Hsiao, this volume for details). The neurons of each pair were recorded from different electrodes separated by at least 400 mms. Correlations were determined after applying a shift predictor to correct for variations in evoked firing rate. Of the total 101 neurons examined, 50 (50%) were members of at least one pair that showed significant effects of attention on correlation. A total of 150 pairs was examined. 18 pairs (12%) showed significant (p<0.01) synchronous firing, with the half-width of the cross-correlation peak approximately 25 ms, and with the degree of correlation covarying with the attentional state of the monkey (8% positive, 4% negative). An 8 additional pairs (5%) showed significant correlation (p<0.01) with a wider cross-correlation peak (half-width ~50 ms). 6 pairs (4%) showed significant (p<0.01) inhibition of one neuron by the other which was affected by attention, typically within 50 ms. Correlation between the remaining 118 pairs (79%) was unaffected by attention. These results indicate that attention changes not only the mean rate of firing of neurons (Hsiao et al., J. Neurophys. 7:444, 1993) but also, for nearly one half of the neurons examined, the degree of synchronization with other neurons as well.
@article{ Steinmetz_etal98a,
author = {Steinmetz, P. N. and Roy, A. and Fitzgerald, P. and Hsiao, S. S.
and Niebur, E. and Johnson, K. O.},
title = {Synchronous firing in the second somatosensory cortex (SII) covaries
with the attentional state of alert monkey},
journal = {Soc. Neurosci. Abstr.},
year = {1998},
volume = {28},
pages = {1513},
month = {November},
abstract = {The degree of correlated activity of pairs of neurons recorded simultaneously
in area SII of an alert behaving monkey was examined. During the
recordings, the animal's focus of attention switched between performing
a tactile discrimination task, where the animal was required to match
the orientations of two sequentially presented bars pressed onto
the monkey's fingerpad, and performing a visual task, where the animal
was required to detect the dimming of a figure presented on a screen
while receiving identical tactile stimulation (see Fitzgerald, Lane
and Hsiao, this volume for details). The neurons of each pair were
recorded from different electrodes separated by at least 400 mms.
Correlations were determined after applying a shift predictor to
correct for variations in evoked firing rate.
Of the total 101 neurons examined, 50 (50%) were members of at least
one pair that showed significant effects of attention on correlation.
A total of 150 pairs was examined. 18 pairs (12%) showed significant
(p<0.01) synchronous firing, with the half-width of the cross-correlation
peak approximately 25 ms, and with the degree of correlation covarying
with the attentional state of the monkey (8% positive, 4% negative).
An 8 additional pairs (5%) showed significant correlation (p<0.01)
with a wider cross-correlation peak (half-width ~50 ms). 6 pairs
(4%) showed significant (p<0.01) inhibition of one neuron by the
other which was affected by attention, typically within 50 ms. Correlation
between the remaining 118 pairs (79%) was unaffected by attention.
These results indicate that attention changes not only the mean rate
of firing of neurons (Hsiao et al., J. Neurophys. 7:444, 1993) but
also, for nearly one half of the neurons examined, the degree of
synchronization with other neurons as well.},
downloads = {Steinmetz_etal98a.pdf; }
}
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During the recordings, the animal's focus of attention switched between performing a tactile discrimination task, where the animal was required to match the orientations of two sequentially presented bars pressed onto the monkey's fingerpad, and performing a visual task, where the animal was required to detect the dimming of a figure presented on a screen while receiving identical tactile stimulation (see Fitzgerald, Lane and Hsiao, this volume for details). The neurons of each pair were recorded from different electrodes separated by at least 400 mms. Correlations were determined after applying a shift predictor to correct for variations in evoked firing rate. Of the total 101 neurons examined, 50 (50%) were members of at least one pair that showed significant effects of attention on correlation. A total of 150 pairs was examined. 18 pairs (12%) showed significant (p<0.01) synchronous firing, with the half-width of the cross-correlation peak approximately 25 ms, and with the degree of correlation covarying with the attentional state of the monkey (8% positive, 4% negative). An 8 additional pairs (5%) showed significant correlation (p<0.01) with a wider cross-correlation peak (half-width ~50 ms). 6 pairs (4%) showed significant (p<0.01) inhibition of one neuron by the other which was affected by attention, typically within 50 ms. Correlation between the remaining 118 pairs (79%) was unaffected by attention. These results indicate that attention changes not only the mean rate of firing of neurons (Hsiao et al., J. Neurophys. 7:444, 1993) but also, for nearly one half of the neurons examined, the degree of synchronization with other neurons as well.","author":["Steinmetz, P. N.","Roy, A.","Fitzgerald, P.","Hsiao, S. S.","Niebur, E.","Johnson, K. 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During the\n\trecordings, the animal's focus of attention switched between performing\n\ta tactile discrimination task, where the animal was required to match\n\tthe orientations of two sequentially presented bars pressed onto\n\tthe monkey's fingerpad, and performing a visual task, where the animal\n\twas required to detect the dimming of a figure presented on a screen\n\twhile receiving identical tactile stimulation (see Fitzgerald, Lane\n\tand Hsiao, this volume for details). The neurons of each pair were\n\trecorded from different electrodes separated by at least 400 mms.\n\tCorrelations were determined after applying a shift predictor to\n\tcorrect for variations in evoked firing rate.\n\t\n\tOf the total 101 neurons examined, 50 (50%) were members of at least\n\tone pair that showed significant effects of attention on correlation.\n\tA total of 150 pairs was examined. 18 pairs (12%) showed significant\n\t(p<0.01) synchronous firing, with the half-width of the cross-correlation\n\tpeak approximately 25 ms, and with the degree of correlation covarying\n\twith the attentional state of the monkey (8% positive, 4% negative).\n\tAn 8 additional pairs (5%) showed significant correlation (p<0.01)\n\twith a wider cross-correlation peak (half-width ~50 ms). 6 pairs\n\t(4%) showed significant (p<0.01) inhibition of one neuron by the\n\tother which was affected by attention, typically within 50 ms. Correlation\n\tbetween the remaining 118 pairs (79%) was unaffected by attention.\n\t\n\tThese results indicate that attention changes not only the mean rate\n\tof firing of neurons (Hsiao et al., J. Neurophys. 7:444, 1993) but\n\talso, for nearly one half of the neurons examined, the degree of\n\tsynchronization with other neurons as well.},\n downloads = {Steinmetz_etal98a.pdf; }\n}","bibtype":"article","downloads":0,"id":"Steinmetz_etal98a","journal":"Soc. Neurosci. 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