Correlation Between the Amplitude of Cortical Activation and Reaction Time: A Functional MRI Study
Mona A. Mohamed1,
David M. Yousem1,
Aylin Tekes1,
Nina Browner1 and
Vince D. Calhoun2,3,4
1 The Russell H. Morgan Department of Radiology and Radiological Sciences,
Division of Neuroradiology, Johns Hopkins Hospital, 600 N Wolfe St., Phipps
B-112, Baltimore, MD 21287.
2 Olin Neuropsychiatry Research Center, Institute of Living, 200 Retreat Ave.,
Hartford, CT 06106.
3 Yale University School of Medicine, 333 Cedar St., New Haven, CT 06510.
4 The Russell H. Morgan Department of Radiology and Radiological Sciences,
Division of Psychiatric Neuroimaging, Johns Hopkins Hospital, Baltimore, MD
21287.
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Fig. 1A. —Functional MRI brain images of random effects group analysis of 32
healthy volunteers. Sagittal (top left), coronal (top
right), and axial (bottom left) T1-weighted (A) and
coronal (top row), sagittal (middle row), and axial
(bottom row) volume-rendered (B) images show visual and motor
activation (red) (p < 0.05, corrected).
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Fig. 1B. —Functional MRI brain images of random effects group analysis of 32
healthy volunteers. Sagittal (top left), coronal (top
right), and axial (bottom left) T1-weighted (A) and
coronal (top row), sagittal (middle row), and axial
(bottom row) volume-rendered (B) images show visual and motor
activation (red) (p < 0.05, corrected).
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Fig. 2. —Bar graph shows averages of maximum amplitudes (% ± SEM) of
each of four regions of interest: right occipital visual area (RO); left
occipital visual area (LO); supplementary motor area (SMA); and left
sensorimotor area (LM1).
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Fig. 3A. —Regression plots show reaction time in milliseconds and maximum
amplitude (percent signal change). Regression plots show reaction time in
milliseconds and maximum amplitude (percent signal change). Four regions of
interest and composite area are right occipital visual area (RO) (A);
left occipital visual area (LO) (B); supplementary motor area
(SMA) (C); left sensorimotor area (LM1) (D); and
composite area (E).
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Fig. 3B. —Regression plots show reaction time in milliseconds and maximum
amplitude (percent signal change). Four regions of interest and composite area
are right occipital visual area (RO) (A); left occipital visual area
(LO) (B); supplementary motor area (SMA) (C); left
sensorimotor area (LM1) (D); and composite area (E).
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Fig. 3C. —Regression plots show reaction time in milliseconds and maximum
amplitude (percent signal change). Four regions of interest and composite area
are right occipital visual area (RO) (A); left occipital visual area
(LO) (B); supplementary motor area (SMA) (C); left
sensorimotor area (LM1) (D); and composite area (E).
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Fig. 3D. —Regression plots show reaction time in milliseconds and maximum
amplitude (percent signal change). Four regions of interest and composite area
are right occipital visual area (RO) (A); left occipital visual area
(LO) (B); supplementary motor area (SMA) (C); left
sensorimotor area (LM1) (D); and composite area (E).
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View larger version (15K):
[in a new window]
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Fig. 3E. —Regression plots show reaction time in milliseconds and maximum
amplitude (percent signal change). Four regions of interest and composite area
are right occipital visual area (RO) (A); left occipital visual area
(LO) (B); supplementary motor area (SMA) (C); left
sensorimotor area (LM1) (D); and composite area (E).
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Copyright © 2004 by the American Roentgen Ray Society.
