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Updated: May 22, 2026
06:06
Optogenetic Functional MRI
Published on: April 19, 2016
Stimulus complexity modulates contrast response functions in the human middle temporal area (hMT+).
Javier O Garcia1, John A Pyles, Emily D Grossman
1Department of Psychology, 9500 Gilman Dr., University of California San Diego, La Jolla, CA 92093-0109, USA. javiergarcia@ucsd.edu
Brain Research
|May 29, 2012
Summary
Brain imaging reveals that the human middle temporal area (hMT+) responds differently to biological motion compared to simple translating motion. This contrast-dependent response in hMT+ suggests complex interactions with form perception brain systems.
Area of Science:
- Neuroscience
- Visual Perception
- Cognitive Neuroscience
Background:
- The middle temporal area (hMT+) is specialized for motion perception in the primate visual system.
- hMT+ is known to interact with other brain systems during complex visual tasks.
Purpose of the Study:
- To investigate the interactions between hMT+ and other brain systems during motion perception.
- To analyze the brain's response to biological motion and translating motion using structure-from-motion.
Main Methods:
- Measured Blood-Oxygen-Level-Dependent (BOLD) contrast response functions in hMT+ for translating and biological motion.
- Controlled for task and attention during the BOLD response measurements.
- Probed for brain areas outside hMT+ exhibiting similar contrast-dependent neural responses.
Main Results:
- BOLD response for translating motion was largely contrast-insensitive.
- BOLD response for biological motion was strongly contrast-dependent.
- Brain areas involved in form perception, including the ventral temporal cortex and superior temporal sulcus, showed similar contrast-dependent responses.
Conclusions:
- The contrast-dependent response in hMT+ for biological motion likely reflects stimulus complexity.
- These findings suggest interactions between hMT+ and shape-based brain systems during complex motion perception.
