Limbic System Topics

• more precise definition
• metal electrodes
• positive reinforcement
• cognitive memory
• penguin books
• memory deficits
• rat brain
• electrical stimulation
• hippocampus
• milner
• synaptic
• exhaustion
• nucleus
• salvage
• inception
• penguin
• rats
• boundaries
• preference

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Limbic System, Limbic System

These responses are heavily modulated by dopaminergic projections from the limbic system. In 1954, Olds and Milner found that rats with metal electrodes implanted into their nucleus accumbens repeatedly pressed a lever activating this region, and did so in preference to eating and drinking, eventually dying of exhaustion. Olds, J., Milner, P. 1954. Positive reinforcement produced by electrical stimulation of septal area and other regions of rat brain.

However, this almost immediately ran into trouble when damage to the hippocampus, a primary limbic structure, was shown to result in severe cognitive (memory) deficits. And since its inception, the delineating boundaries of the limbic system have been changed again and again by the community. More recently, attempts have been made to salvage the concept through more precise definition, but there are still no generally accepted criteria for defining its parts. As a concept grounded more in tradition than in facts, many scientists have suggested that the concept should be considered obsolete and abandoned. Ledoux, J., (2003). Synaptic Self. New York: Penguin Books.

Source: Wikipedia > Limbic System