PURPOSE We evaluated factors that influence MR signal changes during photic stimulation
of the visual cortex. We also tested the hypothesis that functional MR imaging response …

Neuronal activity causes local changes in cerebral blood flow, blood volume, and blood
oxygenation. Magnetic resonance imaging (MRI) techniques sensitive to changes in …

The effect of changes in baseline regional cerebral blood flow (rCBF) values on the cerebral
blood flow response during neuronal activation was studied with functional magnetic …

The response of signal intensity to transient (on‐off) motor and sensory stimulation has been
well studied; however, the dependence of signal response on the duration of stimulus …

Multi‐echo measurements of photic stimulation‐induced signal changes in human visual
cortex were made at 4 Tesla in order to quantify the nature of the signal change and its …

A preliminary investigation of the effects of stimulation of the visual and the motor cortex was
made on a conventional 1.5 T MR imaging scanner. Both types of activation gave a …

Recent advances in functional magnetic resonance imaging (fMRI) at≤ 1.5 T magnetic field
strength and with high speed single-shot echo planar imaging techniques have made it …

OBJECTIVE: The authors evaluated the effect of sex on data derived from activation studies
using blood-oxygenation-level-dependent (BOLD) functional magnetic resonance imaging …

PURPOSE To locate spoiled gradient-echo functional MR signal changes in relation to brain
parenchyma. METHODS The region of the primary visual cortex was evaluated using …

Recovery from optic neuritis has been shown to be associated with an abnormal functional
MRI (fMRI) response following exposure of the eye to an epoch based (ON-OFF design) …