Poster F126, Tuesday, March 28, 8:00 – 10:00 am, Pacific Concourse
Decoding Across Senses the Representations of Everyday Objects from the Lateral Occipital Complex
Raúl Hernández-Pérez1, Laura V. Cuaya1, Luis Concha1, Victor De Lafuente1; 1Instituto de Neurobiología, Universidad Nacional Autónoma de México
Visual paradigms highlight the role of lateral occipital complex (LOC) in the representation of everyday categories. Our goal was to determine if it is possible to decode everyday object categories in LOC independently of the sensory system used. In the first experiment (n=10) each participant explored by means of touch ten categories of everyday objects in each run (12 runs in total). In the second experiment (n=10) we used a multisensory paradigm in which we presented blocks of carrots, breads, apples and marshmallows in independent runs of visual, olfactory, gustatory and tactile modalities (8 runs for each sense). Functional images were acquired on a 3-T Philips scanner (TR/TE = 2000/27 ms, 2x2x3.5 mm3 resolution). A multivoxel pattern analysis and full-brain searchlight were performed using a 5 voxel radius. The resuls show in the fist experiment that the cerebral patterns in LOC can predict with accuracy above chance (p<0.01) the category that the participants were exploring and that the organization of these cerebral patterns are shared between participants. To our knowledge this is the first evidence of a shared organization of tactille categories. In the second experiment we found that the only region with predictions above chance (p<0.05) for all senses was LOC. In conclusion, we found that LOC contains category-specific patterns of BOLD activity, suggesting that LOC encodes high-level characteristics of the stimulus independent of the sensory modality of presentation. We believe that our results are important for understanding the nature of the representations in LOC.
Topic Area: PERCEPTION & ACTION: Multisensory