Neuron
Volume 40, Issue 3, 30 October 2003, Pages 631-642
Journal home page for Neuron

Article
A Higher Order Motion Region in Human Inferior Parietal Lobule: Evidence from fMRI

https://doi.org/10.1016/S0896-6273(03)00590-7Get rights and content
Under an Elsevier user license
open archive

Abstract

The proposal that motion is processed by multiple mechanisms in the human brain has received little anatomical support so far. Here, we compared higher- and lower-level motion processing in the human brain using functional magnetic resonance imaging. We observed activation of an inferior parietal lobule (IPL) motion region by isoluminant red-green gratings when saliency of one color was increased and by long-range apparent motion at 7 Hz but not 2 Hz. This higher order motion region represents the entire visual field, while traditional motion regions predominantly process contralateral motion. Our results suggest that there are two motion-processing systems in the human brain: a contralateral lower-level luminance-based system, extending from hMT/V5+ into dorsal IPS and STS, and a bilateral higher-level saliency-based system in IPL.

Cited by (0)