In a study examining brain differences between practitioners of meditation and those who never meditated, MRI scans showed that:
A several cortical areas were thicker in the meditators' brains than in the nonmeditators.
B several cortical areas were thinner in the meditators' brains than in the nonmeditators.
C the meditators had less gray matter in regions associated with attention, emotion, and sensory processing.
D meditators and nonmeditators have identical brains.