认知的神经基础研究组
2009
  • 题目:Frontoparietal activity with minimal decision and control in the awake macaque at 7T
  • 作者:S. Stoewer; S. P. Ku; J. Goense; N. K. Logothetis; J. Duncan; N. Sigala
  • 刊物名称:39th Annual Meeting of the Society for Neuroscience (Neuroscience 2009)
  • 发表年度:2009
  • DOI:
摘要
In the primate brain a frontoparietal network is involved in many aspects of cognitive control, e.g. during shifts of attention and switches of abstract rules. However, the frontoparietal network in the human brain is also active during simple update of attended information, when task-related decision making is minimal (1) or during the execution of voluntary eye movements (2). The goal of the present study was to identify the network of areas activated by a short series of visual stimuli (meaningless fractal images) while the animals were awake and maintained fixation, in order to compare with the activations elicited in the human brain and to inform and direct future single unit recordings. We obtained activation maps at 7T using BOLD fMRI in three alert macaque monkeys (Macaca mulatta). Functional images were realigned and co-registered with the high-resolution MRI images used in the Saleem and Logothetis atlas (3) to facilitate the identification of the anatomical structures. Areas that were reliably activated in all three animals included areas 8 and F5 around the arcuate sulcus (AS), and the lateral intraparietal area (LIP), along with early and higher areas of the visual system. As in the human, extensive frontoparietal activity was seen despite maintained fixation, and without active behavioural decisions. Additionally, we present preliminary psychophysical and BOLD fMRI results from a second study. In this experiment, we trained one animal to perform a colour discrimination task by making a saccade to the left (for green) or right (for red) of the screen, and then introduced conditions of increased task difficulty. 1. Hon N, Epstein RA, Owen AM, Duncan J. Frontoparietal activity with minimal decision and control. J Neurosci 2006;26(38):9805-9809. 2. Baker JT, Patel GH, Corbetta M, Snyder LH. Distribution of activity across the monkey cerebral cortical surface, thalamus and midbrain during rapid, visually guided saccades. Cereb Cortex 2006;16(4):447-459. 3. Saleem K, Logothetis N. A Combined MRI and Histology Atlas of the Rhesus Monkey Brain: Academic Press; 2006.