20110113

Nelissen & al. — Charting the Lower Superior Temporal Region, a New Motion-Sensitive Region in Monkey Superior Temporal Sulcus (2006)

Koen Nelissen, Wim Vanduffel, and Guy A. Orban — Charting the Lower Superior Temporal Region, a New Motion-Sensitive Region in Monkey Superior Temporal Sulcus, The Journal of Neuroscience 26(22)

This paper explores motion sensitive areas in the superior temporal sulcus (STS) using fMRI. Their approach is to present a diversity of stimuli with different properties, then look at the pairwise differences in fMRI activation between each type of stimulus.

For instance, two areas that might register as strong "motion sensitive" when compared to static stimuli could be further divided into "fast motion sensitive" and "slow motion sensitive" if you looked at differential responses to stimulus speed.

Here is a figure adapted from the article. I will summarize the response properties of the areas below :



MT/V5 : Motion sensitive area, inputs from V1 and eye via retina→SC→pulvinar→MT pathway. Sensitive to fast motion stimuli. Receptive fields about 3°.

MSTv, MSTd : Motion sensitivity like MT but insensitive to kinetic shapes and transparent motion. Prefer 2D motion.

FST : Motion sensitive region, prefers fast stimuli. Opponent motion and kinetic shapes. 3D structure-from-motion. Action sensitive ?

LST : "Motion sensitive region anterior to FST that is also shape sensitive". Action sensitive. "LST is the only region in which there is an interaction between the factor action and the factor presence/absence of the object (i.e., the goal), with the action effect being larger when the object is present."

STPm : Anterior to MSTd, optic flow, large receptive fields, enhanced in right hemisphere

STSa : Not sensitive to motion stimuli in paper, sometimes observed to have IT-like responses ** seems wrong need to go back and check **

IT : This should be labeled area TEO. Area TEO also extends to a motion-insensitive region between FST and LST

No comments:

Post a Comment