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Negative BOLD response in early visual areas of the alert monkey

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons83879

Deubelius,  A
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons84237

Steudel,  T
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Dept. Empirical Inference, Max Planck Institute for Intelligent System, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons84063

Logotethis,  NK
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons84218

Shmuel,  A
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Citation

Deubelius, A., Steudel, T., Logotethis, N., & Shmuel, A. (2005). Negative BOLD response in early visual areas of the alert monkey. Poster presented at 35th Annual Meeting of the Society for Neuroscience (Neuroscience 2005), Washington, DC, USA.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-D3C7-1
Abstract
Previous studies demonstrated negative BOLD response beyond the stimulated regions in V1, V2 and V3 in humans and anesthetized monkeys. Here we demonstrate negative BOLD response in alert monkey early visual areas. Monkeys were trained to stay still during 20 s long trials. Each trial began with 3 s in which a blank gray image was presented, followed by the presentation of a fixation spot (0.15 degrees radius) for 3 s, and a stimulus for 4 s. The stimulus consisted of rotating checkers pattern bound between eccentricities of 2 and 4 degrees. The animals fixated within 1 degree from the fixation spot. A blank gray image was presented during the last 10 s of each trial. A surface coil (40 mm diameter) was positioned in proximity to the operculum of one hemisphere. fMRI was conducted in a vertical bore Bruker 7T magnet, using a GE-EPI sequence. Increased activity (2.5) was observed within the V1, V2, and V3 representations of the stimulated regions in the visual space. Negative BOLD response was detected in these areas in regions corresponding to more peripheral eccentricities. We are currently conducting experiments to further characterize this negative BOLD response.