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Priming
Authors:
Henson, R.N.
Reference:
In New Encyclopedia of Neuroscience, L Squire, T Albright, F Bloom, F Gage & N Spitzer (Eds.), 1055-1063
Year of publication:
2009
CBU number:
7150
Abstract:
Priming refers to a change in behavioral response to a
stimulus, following prior exposure to the same, or a
related, stimulus. Examples include faster reaction
times to make a decision about the stimulus, a bias
to produce that stimulus when generating responses,
or the more accurate identification of a degraded
version of the stimulus. From the memory perspective,
the most exciting aspect to priming concerns
evidence that it can occur in the absence of conscious
memory for the prior exposure (an example of so-called
‘implicit’ or ‘nondeclarative’ memory). For instance,
amnesic patients typically show intact levels
of priming, despite their impairments in conscious
(‘explicit’ or ‘declarative’) memory. Evidence like
this led to the proposal that the brain regions supporting
priming are different from the medial temporal
lobe (MTL) regions believed to support declarative
memory. Indeed, it is often assumed that priming is
the by-product of prior processing of a stimulus, that
is, arising from plasticity in multiple cortical regions
whose primary role is perceptual/conceptual processing.
As such, priming is likely to be one of the most
basic expressions of memory, influencing how we
perceive and interpret the world.