ABSTRACT
Functional Magnetic Resonance Imaging (fMRI) allows non-invasive mapping of cortical function with millimeter resolution allowing comparison of cortical activation across many conditions within subject. The network topology of human cognitive processing can be mapped with fMRI brain imaging technique. There are many reports of fMRI mapping of various regions of cortex. In the visual studies, subjects viewed two 10x10 degree apertures in the lower left and lower right visual fields to determine if both stimuli were identical. There were five visual stimulus conditions in the lower visual field including: thick high luminance contrast stripes, thin high contrast stripes, color contrast thick stripes, fast movement of dots slow movement of dots. The attentional modulation experiments included a comparison of attending to the left and right hemifields. The imaging results typically identify a modest number of interrelated areas the carry out cognitive functions.
