Switch to
| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
3
|
| pubmed:dateCreated |
1976-10-29
|
| pubmed:abstractText |
Thirty-two normal volunteers were tested in three conditions: (1) a constant-foreperiod reaction-time situation consisting of a flash--tone--key-press sequence (control condition); (2) the addition of a short-term memory task consisting of four letters presented within the flash--tone interval with the requirement that they be repeated after key-press to tone (letters--recall); (3) the presentation of letters without short-term memory (letters--no recall). The task involving short-term memory of letters produced a significant reduction in amplitude of CNV for central (Cz) and parietal (Pz) recording sites. The association of CNV decrease and lengthened reaction time to tone was interpreted as a CNV distraction effect. The accompaniment of this distraction effect by elevated heart rate levels and increased frequency of eyeblinks was considered a distraction--arousal association and an important source of disruption in CNV development. These results were interpreted as support for the distraction--arousal hypothesis and appear to provide a sensitive complex of four measures for the evaluation of psychological processes, including the assessment of psychotropic drug effects. Eyeblink frequency in particular appears to be a sensitive indicator of distraction--arousal processes and a potentially useful measure of disturbed psychological functioning. The finding in control conditions of lower CNV amplitude in frontal than in central and posterior recording sites was viewed as a distraction effect due to efforts at eye movement control. The possibility was raised that frontal areas of the brain mediate sustained (tonic) distraction effects whereas centro-parietal regions mediate phasic distraction effects, at least when produced by stimuli of a lexical nature.
|
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:status |
MEDLINE
|
| pubmed:month |
Sep
|
| pubmed:issn |
0013-4694
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:volume |
41
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
277-86
|
| pubmed:dateRevised |
2008-9-9
|
| pubmed:meshHeading |
pubmed-meshheading:60215-Adolescent,
pubmed-meshheading:60215-Adult,
pubmed-meshheading:60215-Arousal,
pubmed-meshheading:60215-Attention,
pubmed-meshheading:60215-Contingent Negative Variation,
pubmed-meshheading:60215-Electrophysiology,
pubmed-meshheading:60215-Eye Movements,
pubmed-meshheading:60215-Female,
pubmed-meshheading:60215-Heart Rate,
pubmed-meshheading:60215-Humans,
pubmed-meshheading:60215-Male,
pubmed-meshheading:60215-Memory, Short-Term,
pubmed-meshheading:60215-Models, Neurological,
pubmed-meshheading:60215-Reaction Time
|
| pubmed:year |
1976
|
| pubmed:articleTitle |
Contingent negative variation and the distraction--arousal hypothesis.
|
| pubmed:publicationType |
Journal Article,
Research Support, U.S. Gov't, Non-P.H.S.
|