Addiction and neural ageing
Addiction and neural ageing

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Glossary for SD805_2
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A measure of the attraction value of a food.


The relief of pain and suffering.

palliative care

The care of patients with active, progressive, far advanced disease and limited prognosis and for whom the focus of care is the quality of life.

paranoid psychosis

Behaviour that is out of touch with conventional reality. Bizarre behaviour in which the sufferer feels persecuted by others and can be dangerous to others.

parasympathetic nervous system

One of the two divisions of the autonomic nervous system. Its activity has a calming effect, e.g. to lower heart rate.

See also sympathetic nervous system.

partial reinforcement

A schedule of reinforcement in which not every response is reinforced. For example, only one in 10 responses made by a rat might earn a pellet of food.

pathogenic paradigm

The conceptualisation of health in terms of disease.


(of nervous system) A collection of axons physically located together within the central nervous system, rather like wires in a cable. An alternative name is tract.

Pavlovian conditioning

peptide bond

The covalent link between adjacent amino acids in peptides and proteins.

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