[Abstract Title]. - Society for Neuroscience

showed significant increases in rCBF. In contrast, significant decreases in rCBF were observed
in the contralateral caudate nucleus and the ventral striatum. Among these areas, a part of M1,
S1, and the parietal area 5 showed significant modulations of rCBF associated with application
of the external loads. These results suggest that the parieto-frontal and somato-motor connections
together with the cerebellar and basal ganglia loops play an essential role for execution of the
visually guided reaching movements, and that the somato-motor connection together with the
parieto-motor connection calculate the arm dynamics.
Disclosures: M. Komatsu, None; Y. Tsutsumi, None; H. Onoe, None; H. Tsukada, None; E.
Miyashita , None.
Poster
262. Visually-Guided Reaching II
Time: Sunday, November 16, 2008, 1:00 pm - 5:00 pm
Program#/Poster#: 262.9/CC23
Topic: D.05.d. Visually guided reaching
Support: International Graduate School of Neuroscience
Title: Contribution of the superior colliculus to error correction in the skeletomotor system
Authors: *S. HEBA, K.-P. HOFFMANN;
Gen. Zoology & Neurobio., Ruhr-University Bochum, Bochum, Germany
Abstract: Goal-directed reach movements were thought to be of a ballistic nature, i.e. their
neural commands are fully planned in advance. In order to achieve precision, the final phase of
the movement might be adapted through feedback mechanisms. This doctrine has been revised in
favour to an “on-line”-monitoring and -correction of skeletomotor commands.
Cortical areas like the posterior parietal cortex, frontal as well as prefrontal areas and the
cerebellum compose the neural correlate. In addition, previous studies also point towards a