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Volume 16, Number 12,
Issue of June 15, 1996
pp. 4032-4040
Copyright ©1996 Society for Neuroscience
Functional Mapping of Human Learning: A Positron Emission
Tomography Activation Study of Eyeblink Conditioning
Received Dec. 11, 1995; accepted March 27, 1996.
Teresa A. Blaxton1,
Thomas A. Zeffiro2,
John
D. E. Gabrieli3,
Susan Y. Bookheimer1,
Maria C. Carrillo4,
William H. Theodore1, and
John F. Disterhoft4
1 Epilepsy Research Branch, National Institute of
Neurological Disorders and Stroke, Bethesda, Maryland 20892, 2 Laboratory of Neurosciences, National Institute of Aging,
Bethesda, Maryland 20892, 3 Department of Psychology,
Stanford University, Stanford, California 94305, and
4 Department of Cell and Molecular Biology, Northwestern
University, Chicago, Illinois 60611
Regional cerebral blood flow (rCBF) was measured using positron
emission tomography during eyeblink conditioning in young adults.
Subjects were scanned in three experimental conditions: delay
conditioning, in which binaural tones preceded air puffs to the right
eye by 400 msec; pseudoconditioning, in which presentations of tone and
air puff stimuli were not correlated in time; and fixation rest, which
served as a baseline control. Compared with fixation,
pseudoconditioning produced rCBF increases in frontal and temporal
cortex, basal ganglia, left hippocampal formation, and pons.
Learning-specific activations were observed in conditioning as compared
with pseudoconditioning in bilateral frontal cortex, left thalamus,
right medial hippocampal formation, left lingual gyrus, pons, and
bilateral cerebellum; decreases in rCBF were observed for bilateral
temporal cortex, and in the right hemisphere in putamen, cerebellum,
and the lateral aspect of hippocampal formation. Blood flow increased
as the level of learning increased in the left hemisphere in caudate,
hippocampal formation, fusiform gyrus, and cerebellum, and in right
temporal cortex and pons. In contrast, activation in left frontal
cortex decreased as learning increased. These functional imaging
results implicate many of the same structures identified by previous
lesion and recording studies of eyeblink conditioning in animals and
humans and suggest that the same brain regions in animals and humans
mediate multiple forms of associative learning that give meaning to a
previously neutral stimulus.
Key words:
learning;
eyeblink conditioning;
positron
emission tomography (PET);
cerebellum;
hippocampus;
frontal cortex;
basal ganglia
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