N

Narcosis

A condition of deep unconsciousness, often caused by narcotics

Natural categories

Those cognitive categories arising from real-life experience

Nature-nurture question

The question involving the relative importance of heredity and environment in the development of the individual and his or her behavior

Neural network (neural net)

A system designed to make use of connections to produce in a machine something of the kind of dynamical memory involved in human learning (parallel distributed processing)

Neuroendocrine

Having to do with the relation between the endocrine system and the brain

Neuroimaging

The constructing of images of the brain by various techniques (see, e.g., computer axial tomography, magnetic resonance imaging)

Neuron

A cell that makes up part of the nervous system; a component of a nerve

Neurosurgeon

A physician whose field of expertise is the brain

Node

In a propositional or semantic network, the representation of a concept

Nonfluent aphasia

See Broca’s aphasia

Nonfunctional degeneration

 A system’s process of forgetting of learned material through disuse

NP

Noun phrase: the portion(s) of a sentence containing a noun