Linked Life Data

15302118

Source:http://linkedlifedata.com/resource/pubmed/id/15302118

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2004-8-10
pubmed:abstractText
Neural correlates of reward-seeking behavior are observed in the nucleus accumbens (NAC). The dependence of these correlates upon the presence of a reward was studied by comparing the behavioral correlates observed when the presence of the reward was manipulated within a single behavioral session. Rats were well-trained on a continuous reinforcement instrumental task reinforced by 0.1 ml drops of 5% sucrose. Extracellular single-unit neural activity was recorded from electrode arrays implanted into the NAC when instrumental behavior was and then was not reinforced with sucrose (within-session extinction). A variable delay between the instrumental response and the sucrose delivery allowed for separation of neural activity related to these task events. A spike activity increase around the time of the instrumental response was the most common behavioral correlate, while a decrease in spike activity upon sucrose delivery was the second most common behavioral correlate. Following removal of the reinforcer, subjects continued to perform the instrumental response, allowing for the examination of response-related spike activity under extinction conditions in which the response was no longer reinforced by sucrose. A majority of the response-related neural activity patterns were lost when sucrose was no longer available. New neural responses also were detected during this period. For some subjects, the reinforcer was again made available during the same session. Encoding of the primary behavioral events during this period of reinstated reinforcer was similar, but not identical, to that observed during the first period of reinforced responding. These findings reveal that instrumental task-associated spike activity within the NAC is partially dependent upon the presence of the reinforcer, and that encoding across the population is distinct under reinforced and extinction conditions.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0166-4328
pubmed:author
pubmed:issnType
Print
pubmed:day
23
pubmed:volume
154
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
125-35
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2004
pubmed:articleTitle
Dynamics of neural coding in the accumbens during extinction and reinstatement of rewarded behavior.
pubmed:affiliation
Department of Neurology, Ernest Gallo Clinic & Research Center, University of California at San Francisco, 5858 Horton St., Suite 200, Emeryville, CA 94608, USA. pjanak@itsa.ucsf.edu
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't