Processing shape, motion, and three-dimensional shape-from-motion in the human cortex

Scott O. Murray, Bruno A. Olshausen, David L Woods

Research output: Contribution to journalArticle

Abstract

Primate visual cortex is segregated into at least two functionally discrete pathways - one that processes motion information and one that processes shape information. However, object motion is a powerful cue for the perceptionof three-dimensional (3D) shape, implying that the two types of information - motion and form - are well integrated.We conducted a series of fMRI experiments aimed at identifying the brain regions involved in inferring 3D shape-from-motion cues. For each subject, we identified regions in occipital-temporal cortex that were activated when perceiving: (1) motion in unstructured random-dot patterns, (2) 2D and 3D line drawing shapes, and (3) 3D shapes defined by motion cues (shape-from-motion, SFM). We found non-overlapping, adjacent areas activated by random motion and line drawing shapes. In addition, we found that SFM stimuli significantly increased activity in only one of the areas identified with either the random motion or line-drawing stimuli, the superior lateral occipital (SLO)region, indicating this area may be important for integrating motion and form information. Closer analyses suggest that SFM and line drawings are processed in separate but closely located sub-regions in SLO. Expanding the analysis to the entire cortex identified a parietal area that had overlapping activity to SFM and line drawings and increased activity to 3D versus 2D shapes. We suggest this area is important for integrating shape information from cue-dependent lateral occipital regions. We also observed significant activity reductions in primary visual cortex (V1) when visual elements (motion vectors and line segments) were grouped into objects, suggesting that activity in early visual areas is reduced as a result of grouping processes performed in higher areas.

Original languageEnglish (US)
JournalJournal of Vision
Volume2
Issue number7
DOIs
StatePublished - 2002

Fingerprint

Occipital Lobe
Cues
Visual Cortex
Temporal Lobe
Primates
Magnetic Resonance Imaging
Brain

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Processing shape, motion, and three-dimensional shape-from-motion in the human cortex. / Murray, Scott O.; Olshausen, Bruno A.; Woods, David L.

In: Journal of Vision, Vol. 2, No. 7, 2002.

Research output: Contribution to journalArticle

@article{695e8065712141f1bfb5ad1de270c97e,
title = "Processing shape, motion, and three-dimensional shape-from-motion in the human cortex",
abstract = "Primate visual cortex is segregated into at least two functionally discrete pathways - one that processes motion information and one that processes shape information. However, object motion is a powerful cue for the perceptionof three-dimensional (3D) shape, implying that the two types of information - motion and form - are well integrated.We conducted a series of fMRI experiments aimed at identifying the brain regions involved in inferring 3D shape-from-motion cues. For each subject, we identified regions in occipital-temporal cortex that were activated when perceiving: (1) motion in unstructured random-dot patterns, (2) 2D and 3D line drawing shapes, and (3) 3D shapes defined by motion cues (shape-from-motion, SFM). We found non-overlapping, adjacent areas activated by random motion and line drawing shapes. In addition, we found that SFM stimuli significantly increased activity in only one of the areas identified with either the random motion or line-drawing stimuli, the superior lateral occipital (SLO)region, indicating this area may be important for integrating motion and form information. Closer analyses suggest that SFM and line drawings are processed in separate but closely located sub-regions in SLO. Expanding the analysis to the entire cortex identified a parietal area that had overlapping activity to SFM and line drawings and increased activity to 3D versus 2D shapes. We suggest this area is important for integrating shape information from cue-dependent lateral occipital regions. We also observed significant activity reductions in primary visual cortex (V1) when visual elements (motion vectors and line segments) were grouped into objects, suggesting that activity in early visual areas is reduced as a result of grouping processes performed in higher areas.",
author = "Murray, {Scott O.} and Olshausen, {Bruno A.} and Woods, {David L}",
year = "2002",
doi = "10.1167/2.7.303",
language = "English (US)",
volume = "2",
journal = "Journal of Vision",
issn = "1534-7362",
publisher = "Association for Research in Vision and Ophthalmology Inc.",
number = "7",

}

TY - JOUR

T1 - Processing shape, motion, and three-dimensional shape-from-motion in the human cortex

AU - Murray, Scott O.

AU - Olshausen, Bruno A.

AU - Woods, David L

PY - 2002

Y1 - 2002

N2 - Primate visual cortex is segregated into at least two functionally discrete pathways - one that processes motion information and one that processes shape information. However, object motion is a powerful cue for the perceptionof three-dimensional (3D) shape, implying that the two types of information - motion and form - are well integrated.We conducted a series of fMRI experiments aimed at identifying the brain regions involved in inferring 3D shape-from-motion cues. For each subject, we identified regions in occipital-temporal cortex that were activated when perceiving: (1) motion in unstructured random-dot patterns, (2) 2D and 3D line drawing shapes, and (3) 3D shapes defined by motion cues (shape-from-motion, SFM). We found non-overlapping, adjacent areas activated by random motion and line drawing shapes. In addition, we found that SFM stimuli significantly increased activity in only one of the areas identified with either the random motion or line-drawing stimuli, the superior lateral occipital (SLO)region, indicating this area may be important for integrating motion and form information. Closer analyses suggest that SFM and line drawings are processed in separate but closely located sub-regions in SLO. Expanding the analysis to the entire cortex identified a parietal area that had overlapping activity to SFM and line drawings and increased activity to 3D versus 2D shapes. We suggest this area is important for integrating shape information from cue-dependent lateral occipital regions. We also observed significant activity reductions in primary visual cortex (V1) when visual elements (motion vectors and line segments) were grouped into objects, suggesting that activity in early visual areas is reduced as a result of grouping processes performed in higher areas.

AB - Primate visual cortex is segregated into at least two functionally discrete pathways - one that processes motion information and one that processes shape information. However, object motion is a powerful cue for the perceptionof three-dimensional (3D) shape, implying that the two types of information - motion and form - are well integrated.We conducted a series of fMRI experiments aimed at identifying the brain regions involved in inferring 3D shape-from-motion cues. For each subject, we identified regions in occipital-temporal cortex that were activated when perceiving: (1) motion in unstructured random-dot patterns, (2) 2D and 3D line drawing shapes, and (3) 3D shapes defined by motion cues (shape-from-motion, SFM). We found non-overlapping, adjacent areas activated by random motion and line drawing shapes. In addition, we found that SFM stimuli significantly increased activity in only one of the areas identified with either the random motion or line-drawing stimuli, the superior lateral occipital (SLO)region, indicating this area may be important for integrating motion and form information. Closer analyses suggest that SFM and line drawings are processed in separate but closely located sub-regions in SLO. Expanding the analysis to the entire cortex identified a parietal area that had overlapping activity to SFM and line drawings and increased activity to 3D versus 2D shapes. We suggest this area is important for integrating shape information from cue-dependent lateral occipital regions. We also observed significant activity reductions in primary visual cortex (V1) when visual elements (motion vectors and line segments) were grouped into objects, suggesting that activity in early visual areas is reduced as a result of grouping processes performed in higher areas.

UR - http://www.scopus.com/inward/record.url?scp=4243138170&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4243138170&partnerID=8YFLogxK

U2 - 10.1167/2.7.303

DO - 10.1167/2.7.303

M3 - Article

VL - 2

JO - Journal of Vision

JF - Journal of Vision

SN - 1534-7362

IS - 7

ER -