We propose to further determine the functional and connectional organization of the dorsal stream visuomotor pathway from visual areas to motor areas. (1) We will identify functional subregions of posterior parietal cortex using microelectrode stimulation and optical imaging of evoked cortical activity. (2) Tracers will be injected in identified subregions and areas of cortex to reveal the cortical and subcortical connectional network. (3) We will evaluate the functional plasticity of posterior parietal subregions as a result of training on visuomotor tasks. (4) Finally, the functional contributions of subdivisions of the dorsal stream system to the performance of visuomotor tasks and the plasticity of the system will be evaluated after lesions of dorsal stream visual areas and parts of posterior parietal cortex. The results of these experiments will provide a new and extended understanding of the functional organization of the subsystem for visuomotor behavior in primates. In addition, the results will inform clinical interpretations of the consequences of damage to the visuomotor system in humans, and suggest mechanisms of recovery. Favorable therapeutic procedures may be based on the results.
The proposed research will help determine how posterior parietal cortex links vision to action. The studies will define functional subdivisions of posterior parietal cortex, determine how these subdivisions fit into a connectional network, and evaluate the behavioral consequences of the loss of visual inputs to the network.
|Stepniewska, Iwona; Gharbawie, Omar A; Burish, Mark J et al. (2014) Effects of muscimol inactivations of functional domains in motor, premotor, and posterior parietal cortex on complex movements evoked by electrical stimulation. J Neurophysiol 111:1100-19|
|Takahata, Toru; Miyashita, Masanobu; Tanaka, Shigeru et al. (2014) Identification of ocular dominance domains in New World owl monkeys by immediate-early gene expression. Proc Natl Acad Sci U S A 111:4297-302|
|Balaram, Pooja; Hackett, Troy A; Kaas, Jon H (2013) Differential expression of vesicular glutamate transporters 1 and 2 may identify distinct modes of glutamatergic transmission in the macaque visual system. J Chem Neuroanat 50-51:21-38|
|Baldwin, Mary K L; Balaram, Pooja; Kaas, Jon H (2013) Projections of the superior colliculus to the pulvinar in prosimian galagos (Otolemur garnettii) and VGLUT2 staining of the visual pulvinar. J Comp Neurol 521:1664-82|
|Kaas, Jon H (2013) The Evolution of Brains from Early Mammals to Humans. Wiley Interdiscip Rev Cogn Sci 4:33-45|
|Young, Nicole A; Collins, Christine E; Kaas, Jon H (2013) Cell and neuron densities in the primary motor cortex of primates. Front Neural Circuits 7:30|
|Collins, C E; Leitch, D B; Wong, P et al. (2013) Faster scaling of visual neurons in cortical areas relative to subcortical structures in non-human primate brains. Brain Struct Funct 218:805-16|
|Cerkevich, Christina M; Qi, Hui-Xin; Kaas, Jon H (2013) Thalamic input to representations of the teeth, tongue, and face in somatosensory area 3b of macaque monkeys. J Comp Neurol 521:3954-71|
|Baldwin, Mary K L; Wei, Haiyang; Reed, Jamie L et al. (2013) Cortical projections to the superior colliculus in tree shrews (Tupaia belangeri). J Comp Neurol 521:1614-32|
|Baldwin, Mary K L; Kaskan, Peter M; Zhang, Bin et al. (2012) Cortical and subcortical connections of V1 and V2 in early postnatal macaque monkeys. J Comp Neurol 520:544-69|
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