Conditioned inhibition of fear-potentiated startle and skin conductance in humans.
Psychophysiology
; 38(5): 807-15, 2001 Sep.
Article
in En
| MEDLINE
| ID: mdl-11577904
ABSTRACT
Conditioned inhibition of classical conditioning was investigated with the startle reflex and the skin conductance response (SCR) in humans using a serial presentation of the conditioned inhibitor (X) and of the conditioned stimulus (CS). The unconditioned stimulus (US) was a shock. During conditioning, participants were presented with two different reinforced CS (A, B) and with X preceding A (noted X-->A). During X-->A, A was not reinforced with the US. During the summation test, B, X-->B, and Y-->B were presented (Y was a new stimulus that tested the specificity of the inhibitory properties of X). B was not reinforced during the summation test. A, B, X, and Y were lights of different colors. Participants were divided into a low and a high anxious group based on the TPQ (C.R. Cloninger, 1987). In the low anxious group, conditioned startle potentiation and SCR responses to A were inhibited when X preceded A (noted A(XA)). This differential responding to A and A(XA) emerged earlier with the SCR than with startle. During the summation test, the inhibitory properties of X did not transfer to B. In the high anxious group, there was only a differential SCR to A and A(XA). X did not inhibit startle potentiation to A.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Reflex, Startle
/
Fear
/
Galvanic Skin Response
Limits:
Adolescent
/
Adult
/
Female
/
Humans
/
Male
Language:
En
Journal:
Psychophysiology
Year:
2001
Document type:
Article