Send to

Choose Destination
J Exp Psychol Anim Behav Process. 1998 Jul;24(3):316-24.

Time of conditioning selectively influences contextual fear conditioning: further support for a multiple-memory systems view of fear conditioning.

Author information

Department of Psychology, University of Colorado, Boulder 80309, USA.


Time of conditioning influences long-term retention of contextual but not auditory-cue fear conditioning. Long-Evans rats (Rattus norvegicus) conditioned at 12 noon displayed reduced contextual fear conditioning compared to rats conditioned at 8 a.m. or 4 p.m. This effect was eliminated by exposure to the context 24 hr prior to conditioning and by a posttrial injection of corticosterone (1.0 mg/kg). Time of conditioning did not influence short-term retention of contextual fear. These results suggest that time of conditioning influences the posttrial processes that construct a memory representation of the context. They also support the view that contextual and auditory-cue fear conditioning depend on different processes. These results are discussed in relation to the concept of memory storage modulators.

[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for American Psychological Association
Loading ...
Support Center