Adaptation to objects in the lateral occipital complex (LOC): shape or semantics?
A change in the basic-level class when viewing a sequence of two objects produces a large release from adaptation in LOC compared to when the images are identical. Is this due to a change in semantics or shape? In an fMRI-adaptation experiment, subjects viewed a sequence of two objects and judged whether the stimuli were identical in shape. Different-shaped stimuli could be from the same or different basic-level classes, where the physical similarities of the pairs in the two conditions were equated by a model of simple cell similarity. BOLD responses in LOC for the two conditions were equivalent, and higher than that of the identical condition, indicating that LOC is sensitive to shape rather than to basic-level semantics.
Kim
Jiye G
JG
University of Southern California, Department of Psychology, 3641 Watt Way, Los Angeles, CA 90089, USA. jiyekim@usc.edu
Biederman
Irving
I
Lescroart
Mark D
MD
Hayworth
Kenneth J
KJ
D000222:Adaptation, Physiological / Q000502:physiology; D000328:Adult; D001931:Brain Mapping / Q000379:methods; D004192:Discrimination, Psychological / Q000502:physiology; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008959:Models, Neurological; D008960:Models, Psychological; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods; D010865:Pilot Projects; D011601:Psychophysics; D011930:Reaction Time / Q000502:physiology; D012660:Semantics; D014793:Visual Cortex / Q000502:physiology*; D055815:Young Adult