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Bottom-up Retinotopic Organization Supports Top-down Mental Imagery
- Source :
- The Open Neuroimaging Journal
- Publication Year :
- 2013
- Publisher :
- Bentham Open, 2013.
-
Abstract
- Finding a path between locations is a routine task in daily life. Mental navigation is often used to plan a route to a destination that is not visible from the current location. We first used functional magnetic resonance imaging (fMRI) and surface-based averaging methods to find high-level brain regions involved in imagined navigation between locations in a building very familiar to each participant. This revealed a mental navigation network that includes the precuneus, retrosplenial cortex (RSC), parahippocampal place area (PPA), occipital place area (OPA), supplementary motor area (SMA), premotor cortex, and areas along the medial and anterior intraparietal sulcus. We then visualized retinotopic maps in the entire cortex using wide-field, natural scene stimuli in a separate set of fMRI experiments. This revealed five distinct visual streams or ‘fingers’ that extend anteriorly into middle temporal, superior parietal, medial parietal, retrosplenial and ventral occipitotemporal cortex. By using spherical morphing to overlap these two data sets, we showed that the mental navigation network primarily occupies areas that also contain retinotopic maps. Specifically, scene-selective regions RSC, PPA and OPA have a common emphasis on the far periphery of the upper visual field. These results suggest that bottom-up retinotopic organization may help to efficiently encode scene and location information in an eye-centered reference frame for top-down, internally generated mental navigation. This study pushes the border of visual cortex further anterior than was initially expected.
- Subjects :
- genetic structures
Computer science
Precuneus
Intraparietal sulcus
050105 experimental psychology
Article
five visual streams
Premotor cortex
03 medical and health sciences
0302 clinical medicine
Retrosplenial cortex
Cortex (anatomy)
medicine
0501 psychology and cognitive sciences
Radiology, Nuclear Medicine and imaging
Computer vision
Supplementary motor area
medicine.diagnostic_test
business.industry
05 social sciences
fMRI
mental navigation
Visual cortex
medicine.anatomical_structure
retinotopic maps
Neurology (clinical)
Artificial intelligence
Functional magnetic resonance imaging
business
far periphery
030217 neurology & neurosurgery
Subjects
Details
- Language :
- English
- ISSN :
- 18744400
- Volume :
- 7
- Database :
- OpenAIRE
- Journal :
- The Open Neuroimaging Journal
- Accession number :
- edsair.doi.dedup.....98a03b72d28043f082491bc024afc97b