What is it about?
We tested sensitivity of different dorsal (action) stream areas to repeated grasping movements, and repeated target objects. Anterior intraparietal sulcus, and some of the neighbouring areas showed clear signal decreases (adaptation, sensitivity) following both grasp and object repetition. The left ventral premotor cortex and the bilateral dorsal premotor cortex showed sensitivity only to grasp type.
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Why is it important?
One of the first projects in the world that utilized fMRI repetition-suppression effects in the context of real actions, and real objects to test some of the predictions of the perception-action dissociation model (by Goodale & Milner). We showed that the parieto-frontal areas show differential involvement in visuomotor processing, which depends on whether the action or the object has been previously experienced.
Perspectives
At the time, many people knew what should be done and why. But only Jody Culham was ready to take up the challenges ahead. A new "grasparatus" was designed and built, new stimuli created, many obstacles had to be overcome. My first mature project, although the guidance from Jody was priceless.
Professor (Full) Gregory Kroliczak
Uniwersytet im Adama Mickiewicza w Poznaniu
Read the Original
This page is a summary of: The Human Dorsal Stream Adapts to Real Actions and 3D Shape Processing: A Functional Magnetic Resonance Imaging Study, Journal of Neurophysiology, August 2008, American Physiological Society,
DOI: 10.1152/jn.01376.2007.
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