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Direct linkBriggs, James F.; Olson, Brian P. – Learning & Memory, 2013
We investigated whether reexposure to an amnestic agent would reverse amnesia for extinction of learned fear similar to that of a reactivated memory. When cycloheximide (CHX) was administered immediately after a brief cue-induced memory reactivation (15 sec) and an extended extinction session (12 min) rats showed retrograde amnesia for both…
Descriptors: Memory, Models, Fear, Drug Use
Graham, Bronwyn M.; Richardson, Rick – Learning & Memory, 2011
These experiments examined the effects of the NMDA-receptor (NMDAr) antagonist MK801 on reacquisition and re-extinction of a conditioned fear that had been previously extinguished before injection of fibroblast growth factor-2 (FGF2) or vehicle. Recent findings have shown that relearning and re-extinction, unlike initial learning and extinction,…
Descriptors: Fear, Anxiety, Experimental Psychology, Learning
Flavell, Charlotte R.; Lee, Jonathan L. C. – Learning & Memory, 2012
The basolateral amygdala (BLA) and the dorsal hippocampus (dHPC) are both structures with key roles in contextual fear conditioning. During fear conditioning, it is postulated that contextual representations of the environment are formed in the hippocampus, which are then associated with foot shock in the amygdala. However, it is not known to what…
Descriptors: Conditioning, Fear, Neurological Impairments, Context Effect
Calandreau, Ludovic; Desgranges, Bertrand; Jaffard, Robert; Desmedt, Aline – Learning & Memory, 2010
The aim of the present experiment was to directly assess the role of the glutamatergic hippocampal-lateral septal (HPC-LS) neurotransmission in tone and contextual fear conditioning. We found that pretraining infusion of glutamatergic acid into the lateral septum promotes tone conditioning and concomitantly disrupts contextual conditioning.…
Descriptors: Context Effect, Conditioning, Fear, Experiments
Kuhn, Cynthia M.; LaBar, Kevin S.; Zorawski, Michael; Blanding, Nineequa Q. – Learning & Memory, 2006
We examined the relationship between stress hormone (cortisol) release and acquisition and consolidation of conditioned fear learning in healthy adults. Participants underwent acquisition of differential fear conditioning, and consolidation was assessed in a 24-h delayed extinction test. The acquisition phase was immediately followed by an 11-min…
Descriptors: Relationship, Anxiety, Sexuality, Biochemistry
Kamprath, Kornelia; Hermann, Heike; Lutz, Beat; Marsicano, Giovanni; Cannich, Astrid; Wotjak, Carsten T. – Learning & Memory, 2004
Cannabinoid receptors type 1 (CB1) play a central role in both short-term and long-term extinction of auditory-cued fear memory. The molecular mechanisms underlying this function remain to be clarified. Several studies indicated extracellular signal-regulated kinases (ERKs), the phosphatidylinositol 3-kinase with its downstream effector AKT, and…
Descriptors: Brain, Animals, Learning Processes, Animal Behavior
