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  4. LSD alters eyes-closed functional connectivity within the early visual cortex in a retinotopic fashion
 
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LSD alters eyes-closed functional connectivity within the early visual cortex in a retinotopic fashion
File(s)
Leor Retinotopic_Coordination_2016_02_04.docx (227.58 KB)
Accepted version
Author(s)
Roseman, L
Sereno, MI
Leech, R
Kaelen, M
Orban, C
more
Type
Journal Article
Abstract
The question of how spatially organized activity in the visual cortex behaves during eyes-closed, lysergic acid diethylamide (LSD)-induced "psychedelic imagery" (e.g., visions of geometric patterns and more complex phenomena) has never been empirically addressed, although it has been proposed that under psychedelics, with eyes-closed, the brain may function "as if" there is visual input when there is none. In this work, resting-state functional connectivity (RSFC) data was analyzed from 10 healthy subjects under the influence of LSD and, separately, placebo. It was suspected that eyes-closed psychedelic imagery might involve transient local retinotopic activation, of the sort typically associated with visual stimulation. To test this, it was hypothesized that, under LSD, patches of the visual cortex with congruent retinotopic representations would show greater RSFC than incongruent patches. Using a retinotopic localizer performed during a nondrug baseline condition, nonadjacent patches of V1 and V3 that represent the vertical or the horizontal meridians of the visual field were identified. Subsequently, RSFC between V1 and V3 was measured with respect to these a priori identified patches. Consistent with our prior hypothesis, the difference between RSFC of patches with congruent retinotopic specificity (horizontal-horizontal and vertical-vertical) and those with incongruent specificity (horizontal-vertical and vertical-horizontal) increased significantly under LSD relative to placebo, suggesting that activity within the visual cortex becomes more dependent on its intrinsic retinotopic organization in the drug condition. This result may indicate that under LSD, with eyes-closed, the early visual system behaves as if it were seeing spatially localized visual inputs. Hum Brain Mapp, 2016. © 2016 Wiley Periodicals, Inc.
Date Issued
2016-04-29
Date Acceptance
2016-04-12
Citation
Human Brain Mapping, 2016, 37 (8), pp.3031-3040
URI
http://hdl.handle.net/10044/1/32521
DOI
https://www.dx.doi.org/10.1002/hbm.23224
ISSN
1097-0193
Publisher
Wiley
Start Page
3031
End Page
3040
Journal / Book Title
Human Brain Mapping
Volume
37
Issue
8
Copyright Statement
© 2016 Wiley Periodicals, Inc. This is the accepted version of the following article: Roseman, L., Sereno, M. I., Leech, R., Kaelen, M., Orban, C., McGonigle, J., Feilding, A., Nutt, D. J. and Carhart-Harris, R. L. (2016), LSD alters eyes-closed functional connectivity within the early visual cortex in a retinotopic fashion. Hum. Brain Mapp., which has been published in final form at http://dx.doi.org/10.1002/hbm.23224
Sponsor
The Beckley Foundation
Grant Number
N/A
Subjects
LSD
fMRI
hallucinations
imagery
psychedelics
serotonin 5-HT2 receptor agonists
visual cortex
Experimental Psychology
1109 Neurosciences
1702 Cognitive Science
Publication Status
Published
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