When presented in a neutral context, emotional items interfere with episodic encoding of temporally contiguous non-emotional items, resulting in dissociable valence-dependent retrograde and arousal-dependent anterograde modulatory effects. By studying two rare patients with congenital lipoid proteinosis (Urbach-Wiethe) and a focal disease emphasis on the basolateral amygdala (BLA), we demonstra...

Stimuli that possess inherently rewarding or aversive qualities elicit emotional responses and also induce learning by imparting valence upon neutral sensory cues. Evidence has accumulated implicating the amygdala as a critical structure in mediating these processes. We have developed a genetic strategy to identify the representations of rewarding and aversive unconditioned stimuli (USs) in the...

The present study investigates the fear memory resulting from the interaction of a stressful experience and the retrieval of an established fear memory trace. Such a combination enhanced both fear expression and fear retention in adult Wistar rats. Likewise, midazolam intra-basolateral amygdala (BLA) infusion prior to stress attenuated the enhancement of fear memory thus suggesting the involvem...

Memory consolidation involves the process by which newly acquired information becomes stored in a long-lasting fashion. Evidence acquired over the past several decades, especially from studies using post-training drug administration, indicates that emotional arousal during the consolidation period influences and enhances the strength of the memory and that multiple different chemical signaling ...

Drinking response to hypertonio saline, a cellular thirst stimulus, and to isoproterenol, probably an extracellular thirst stimulus, was normal in rats with bilateral lesions in the basolateral region of the amygdala. The overnight water intake of the lesioned rats was a little higher than normal. However, the lesioned rats showed a major impairment in learning to avoid ingesting a poisonous so...

Although D1 receptor knockout mice demonstrate normal morphine place preferences, antagonism of basolateral amygdala (BLA) D1 receptors only during drug-naive rat conditioning has been reported to inhibit the expression of a morphine place preference. One possible explanation for this result is state-dependent learning. That is, the omission of the intra-BLA infusion cue during testing - which ...

In goal-directed pursuits, the basolateral amygdala (BLA) is critical in learning about changes in the value of rewards. BLA-lesioned rats show enhanced reversal learning, a task employed to measure the flexibility of response to changes in reward. Similarly, there is a trend for enhanced discrimination learning, suggesting that BLA may modulate formation of stimulus-reward associations. There ...

One recent perspective (Blundell et al., 2001; 2003; Killcross and Blundell, 2002; Balleine et al. 2003) on the function of the basolateral region of the amygdala (BLA) suggests that it plays an important role in the representation of the sensory features of motivationally significant events. This predicts that lesions of the BLA will not produce a decrement in performance in conditioning proce...

Why do we need it? The amygdala is involved in fear, anxiety and aggression. Monkeys without an amygdala are not appropriately afraid of humans or of the boss monkey of their troop. Rats without an amygdala might play with their native predators, such as cats or snakes. A person with a dysfunctional amygdala finds everyone trustworthy, and can’t sense when someone else is afraid. It’s also now ...

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