Functional magnetic resonance imaging adaptation (FMRIa) is a method of
functional magnetic resonance imaging that reads the brain changes occurring in response to long exposure to evocative stimulus.
[{{Cite journal, last=Grill-Spector, first=Kalanit, last2=Malach, first2=Rafael, date=2001, title=fMR-adaptation: a tool for studying the functional properties of human cortical neurons, journal=Acta Psychologica, language=en, volume=107, issue=1–3, pages=293–321, doi=10.1016/S0001-6918(01)00019-1, pmid=11388140] If Stimulus 1 (S
1) excites a certain neuronal population, repeated exposure to S
1 will result in subsequently attenuated responses. This
adaptation may be due to neural fatigue or coupled hemodynamic processes. However, when S
1 is followed by a unique stimulus, S
2, the response amplitudes should not be attenuated as a fresh sub-population of neurons is excited. Using this technique can allow researchers to determine if the same or unique neuronal groups are involved in processing two stimuli.
[Krekelberg, B, Boynton, G.M., & van Wezel, R.J.A. (2006). Adaptation: from single cells to BOLD signals. ''Trends in Neurosciences''.]
Usage
This technique has been used successfully in examination of the visual system, particularly orientation, motion, and face recognition.
See also
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Adaptive system
An adaptive system is a set of interacting or interdependent entities, real or abstract, forming an integrated whole that together are able to respond to environmental changes or changes in the interacting parts, in a way analogous to either conti ...
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Functional magnetic resonance imaging
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Neural adaptation
Neural adaptation or sensory adaptation is a gradual decrease over time in the responsiveness of the sensory system to a constant stimulus. It is usually experienced as a change in the stimulus. For example, if a hand is rested on a table, the tab ...
References
Magnetic resonance imaging