RT Journal Article
SR Electronic
T1 Neuronal activity within the nucleus basalis and conditioned neocortical electroencephalographic activation
JF The Journal of Neuroscience
JO J. Neurosci.
FD Society for Neuroscience
SP 1623
OP 1633
DO 10.1523/JNEUROSCI.14-03-01623.1994
VO 14
IS 3
A1 PJ Whalen
A1 BS Kapp
A1 JP Pascoe
YR 1994
UL http://www.jneurosci.org/content/14/3/1623.abstract
AB The relationship between neuronal activity within the nucleus basalis (NB) and conditioned neocortical EEG activation was investigated in New Zealand rabbits during Pavlovian differential conditioning. Twenty- seven of 56 neurons recorded in conditioned animals demonstrated a significantly greater change in activity to a tone (CS+) that predicted the occurrence of a mildly aversive unconditioned stimulus when compared to a tone (CS-) that did not. Twenty-four of these 27 neurons demonstrated a significant increase in activity to the CS+ compared to the CS-, while the remaining three neurons demonstrated a significant decrease in activity to the CS+ compared to the CS-. In 24 of these 27 neurons (89%) these changes in neuronal activity during CS presentations correlated significantly with a decrease in the power of delta activity in the EEG. In addition, 13 of these 24 neurons (54%) demonstrated significant correlations between neuronal activity and the power of delta activity during CS-free periods. In experimentally naive animals, the activity of 10 of 22 neurons (45%) recorded within the region of the NB correlated with the power of delta activity in the EEG during stimulus-free periods. These results complement a growing body of evidence and provide strong support for the hypothesis that the NB contributes to neocortical activation in the conscious animal.