Abstract #5367

Evidence of modulation of laminar profiles by contextual modulation in V1 using high-resolution fMRI

Kimberly B Weldon¹, Michael-Paul Schallmo², Philip C Burton³, Andrea N Grant⁴, and Cheryl A Olman¹

¹Department of Psychology, University of Minnesota, Minneapolis, MN, United States, ²Department of Psychology, University of Washington, Seattle, WA, United States, ³Office of the Associate Dean for Research, University of Minnesota, Minneapolis, MN, United States, ⁴Department of Neuroscience, University of Minnesota, Minneapolis, MN, United States

We characterized depth-dependent laminar profiles of surround suppression in human early visual cortex with high-resolution 7T fMRI. In a block-design participants viewed circular target stimuli (gratings defined by sinusoidal luminance modulation) surrounded by an annulus with a grating either parallel or orthogonal to the target grating. The surround was placed either adjacent to the target grating (Near) or separated from the target by 2° of visual angle (Far). Results show a similar activation profile for Parallel and Orthogonal conditions in the Far condition across depth. For the Near condition, contextual modulation occurred more in deep, rather than superficial layers.

How to access this content:

For one year after publication, abstracts and videos are only open to registrants of this annual meeting. Registrants should use their existing login information. Non-registrant access can be purchased via the ISMRM E-Library.

After one year, current ISMRM & ISMRT members get free access to both the abstracts and videos. Non-members and non-registrants must purchase access via the ISMRM E-Library.

After two years, the meeting proceedings (abstracts) are opened to the public and require no login information. Videos remain behind password for access by members, registrants and E-Library customers.

Click here for more information on becoming a member.