NDLI: fMRI orientation decoding in V1 does not require global maps or globally coherent orientation stimuli

Content Provider	PubMed Central
Author	Alink, Arjen Alexandra, Krugliak Walther, Alexander Kriegeskorte, Nikolaus
Copyright Year	2013
Abstract	The orientation of a large grating can be decoded from V1 functional magnetic resonance imaging (fMRI) data, even at low resolution (3-mm isotropic voxels). This finding has suggested that columnar-level neuronal information might be accessible to fMRI at 3T. However, orientation decodability might alternatively arise from global orientation-preference maps. Such global maps across V1 could result from bottom-up processing, if the preferences of V1 neurons were biased toward particular orientations (e.g., radial from fixation, or cardinal, i.e., vertical or horizontal). Global maps could also arise from local recurrent or top-down processing, reflecting pre-attentive perceptual grouping, attention spreading, or predictive coding of global form. Here we investigate whether fMRI orientation decoding with 2-mm voxels requires (a) globally coherent orientation stimuli and/or (b) global-scale patterns of V1 activity. We used opposite-orientation gratings (balanced about the cardinal orientations) and spirals (balanced about the radial orientation), along with novel patch-swapped variants of these stimuli. The two stimuli of a patch-swapped pair have opposite orientations everywhere (like their globally coherent parent stimuli). However, the two stimuli appear globally similar, a patchwork of opposite orientations. We find that all stimulus pairs are robustly decodable, demonstrating that fMRI orientation decoding does not require globally coherent orientation stimuli. Furthermore, decoding remained robust after spatial high-pass filtering for all stimuli, showing that fine-grained components of the fMRI patterns reflect visual orientations. Consistent with previous studies, we found evidence for global radial and vertical preference maps in V1. However, these were weak or absent for patch-swapped stimuli, suggesting that global preference maps depend on globally coherent orientations and might arise through recurrent or top-down processes related to the perception of global form.
Related Links	http://dx.doi.org/10.3389/fpsyg.2013.00493
Starting Page	493
File Format	PDF
ISSN	16641078
e-ISSN	16641078
Journal	Frontiers in Psychology
Volume Number	4
Language	English
Publisher	Frontiers Media S.A.
Publisher Date	2013-01-01
Access Restriction	Open
Rights Holder	Frontiers Media S.A.
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Psychology

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

FMRI orientation decoding in V1 does not require global maps or globally coherent orientation stimuli

Orientation decoding depends on maps, not columns

Attentional modulation of fMRI responses in human V1 is consistent with distinct spatial maps for chromatically-defined orientation and contrast

Igf2 imprinting does not require its own DNA methylation or H19 RNA

Dynamics of Orientation Tuning in Cat V1 Neurons Depend on Location Within Layers and Orientation Maps

Monochromaticity of Orientation Maps in V1 Implies Minimum Variance for Hypercolumn Size

Neural basis of the cognitive map: Path integration does not require hippocampus or entorhinal cortex

Inhibition of Hippocampal Synaptic Activity by ATP, Hypoxia or Oxygen-Glucose Deprivation Does Not Require CD73

Bradyrhizobium japonicum does not require alpha-ketoglutarate dehydrogenase for growth on succinate or malate.

fMRI orientation decoding in V1 does not require global maps or globally coherent orientation stimuli

Similar Documents

FMRI orientation decoding in V1 does not require global maps or globally coherent orientation stimuli

Orientation decoding depends on maps, not columns

Attentional modulation of fMRI responses in human V1 is consistent with distinct spatial maps for chromatically-defined orientation and contrast

Igf2 imprinting does not require its own DNA methylation or H19 RNA

Dynamics of Orientation Tuning in Cat V1 Neurons Depend on Location Within Layers and Orientation Maps

Monochromaticity of Orientation Maps in V1 Implies Minimum Variance for Hypercolumn Size

Neural basis of the cognitive map: Path integration does not require hippocampus or entorhinal cortex

Inhibition of Hippocampal Synaptic Activity by ATP, Hypoxia or Oxygen-Glucose Deprivation Does Not Require CD73

Bradyrhizobium japonicum does not require alpha-ketoglutarate dehydrogenase for growth on succinate or malate.

fMRI orientation decoding in V1 does not require global maps or globally coherent orientation stimuli