TY - JOUR

T1 - A double dissociation between sensitivity to changes in object identity and object orientation in the ventral and dorsal visual streams

T2 - A human fMRI study

AU - Valyear, Kenneth F

AU - Culham, Jody C

AU - Sharif, Nadder

AU - Westwood, David

AU - Goodale, Melvyn A

PY - 2006/2

Y1 - 2006/2

N2 - We used an event-related fMR-adaptation paradigm to investigate changes in BOLD activity in the dorsal and ventral visual streams as a function of object identity and object orientation. Participants viewed successive paired images of real-world, graspable objects, separated by a visual mask. The second image of each pair was either: (i) the same as the first image, (ii) different only in identity, (iii) different only in orientation, or (iv) different in both identity and orientation. A region in the parieto-occipital cortex (dorsal stream) showed a selective increase in BOLD activity with changes in object orientation, but was insensitive to changes in object identity. In contrast, a region in the temporo-occipital cortex (ventral stream) showed a selective increase in activity with changes in identity, but was insensitive to changes in orientation. The differential sensitivity to orientation and identity is consistent with the idea that the dorsal stream plays a critical role in the visual control of object-directed actions while the ventral stream plays a critical role in object perception.

AB - We used an event-related fMR-adaptation paradigm to investigate changes in BOLD activity in the dorsal and ventral visual streams as a function of object identity and object orientation. Participants viewed successive paired images of real-world, graspable objects, separated by a visual mask. The second image of each pair was either: (i) the same as the first image, (ii) different only in identity, (iii) different only in orientation, or (iv) different in both identity and orientation. A region in the parieto-occipital cortex (dorsal stream) showed a selective increase in BOLD activity with changes in object orientation, but was insensitive to changes in object identity. In contrast, a region in the temporo-occipital cortex (ventral stream) showed a selective increase in activity with changes in identity, but was insensitive to changes in orientation. The differential sensitivity to orientation and identity is consistent with the idea that the dorsal stream plays a critical role in the visual control of object-directed actions while the ventral stream plays a critical role in object perception.

KW - Brain Mapping

KW - Evoked Potentials, Visual

KW - Female

KW - Form Perception

KW - Humans

KW - Magnetic Resonance Imaging

KW - Male

KW - Mental Processes

KW - Occipital Lobe

KW - Orientation

KW - Parietal Lobe

KW - Pattern Recognition, Visual

KW - Reference Values

KW - Saccades

KW - Visual Pathways

KW - Clinical Trial

KW - Comparative Study

KW - Journal Article

KW - Research Support, Non-U.S. Gov't

U2 - 10.1016/j.neuropsychologia.2005.05.004

DO - 10.1016/j.neuropsychologia.2005.05.004

M3 - Article

C2 - 15955539

VL - 44

SP - 218

EP - 228

JO - Neuropsychologia

JF - Neuropsychologia

SN - 0028-3932

IS - 2

ER -