Article,
A comparison of neural circuits underlying auditory and visual object categorization.
Neuroimage, 16 (2): 361--377 (2002)
DOI: 10.1006/nimg.2002.1088
Abstract
Knowledge about environmental objects derives from representations
of multiple object features both within and across sensory modalities.
While our understanding of the neural basis for visual object representation
in the human and nonhuman primate brain is well advanced, a similar
understanding of auditory objects is in its infancy. We used a name
verification task and functional magnetic resonance imaging (fMRI)
to characterize the neural circuits that are activated as human subjects
match visually presented words with either simultaneously presented
pictures or environmental sounds. The difficulty of the matching
judgment was manipulated by varying the level of semantic detail
at which the words and objects were compared. We found that blood
oxygen level dependent (BOLD) signal was modulated in ventral and
dorsal regions of the inferior frontal gyrus of both hemispheres
during auditory and visual object categorization, potentially implicating
these areas as sites for integrating polymodal object representations
with concepts in semantic memory. As expected, BOLD signal increases
in the fusiform gyrus varied with the semantic level of object categorization,
though this effect was weak and restricted to the left hemisphere
in the case of auditory objects.
Tags
- adult;
- auditory
- brain;
- cerebrovascular
- circulation;
- classification;
- comparative
- female;
- gov't,
- gov't;
- humans;
- imaging;
- magnetic
- male;
- mental
- names;
- non-u.s.
- oxygen;
- p.h.s.;
- pathways;
- pattern
- perception
- perception;
- processes;
- recall;
- recognition,
- research
- resonance
- study;
- support,
- u.s.
- visual
- visual;
