The study will investigate how visual information is represented in the prefrontal cortex, the brain area involved with higher cognitive functions, before and after learning to perform a cognitive task. Monkeys will be trained in cognitive tasks that require them to observe and remember visual stimuli. Neurophysiological recordings with an array of microelectrodes at various training stages will allow us to determine the patterns of neuronal activation and the functional interactions between neurons. The experiments will uncover the nature of changes that take place in the prefrontal cortex by learning to perform a cognitive task.
The experiments will test what changes occur in the prefrontal cortex after subjects are trained to perform a cognitive task that requires visual, short-term memory. Cognitive training has shown promise in restoring function after traumatic brain injury, in ameliorating the effects of normal aging, and improving cognitive symptoms of disorders such as Alzheimer's disease. Our results will uncover the changes in brain circuits following cognitive training and offer insights on the design of better treatment strategies for dealing with cognitive decline associated with these conditions.
|Zhou, Xin; Zhu, Dantong; Katsuki, Fumi et al. (2014) Age-dependent changes in prefrontal intrinsic connectivity. Proc Natl Acad Sci U S A 111:3853-8|
|Qi, Xue-Lian; Constantinidis, Christos (2013) Neural changes after training to perform cognitive tasks. Behav Brain Res 241:235-43|
|Meyers, Ethan M; Qi, Xue-Lian; Constantinidis, Christos (2012) Incorporation of new information into prefrontal cortical activity after learning working memory tasks. Proc Natl Acad Sci U S A 109:4651-6|
|Zhou, Xin; Katsuki, Fumi; Qi, Xue-Lian et al. (2012) Neurons with inverted tuning during the delay periods of working memory tasks in the dorsal prefrontal and posterior parietal cortex. J Neurophysiol 108:31-8|
|Qi, Xue-Lian; Meyer, Travis; Stanford, Terrence R et al. (2012) Neural correlates of a decision variable before learning to perform a match/non-match task. J Neurosci 32:6161-9|
|Qi, Xue-Lian; Meyer, Travis; Stanford, Terrence R et al. (2011) Changes in prefrontal neuronal activity after learning to perform a spatial working memory task. Cereb Cortex 21:2722-32|
|Meyer, Travis; Qi, Xue-Lian; Stanford, Terrence R et al. (2011) Stimulus selectivity in dorsal and ventral prefrontal cortex after training in working memory tasks. J Neurosci 31:6266-76|
|Meyer, Travis; Qi, Xue-Lian; Constantinidis, Christos (2007) Persistent discharges in the prefrontal cortex of monkeys naive to working memory tasks. Cereb Cortex 17 Suppl 1:i70-6|