The representation of object distance: evidence from neuroimaging and neuropsychology.

Frontiers in Human Neuroscience
Marian E Berryhill, Ingrid R Olson

Abstract

Perceived distance in two-dimensional (2D) images relies on monocular distance cues. Here, we examined the representation of perceived object distance using a continuous carry-over adaptation design for fMRI. The task was to look at photographs of objects and make a judgment as to whether or not the item belonged in the kitchen. Importantly, this task was orthogonal to the variable of interest: the object's perceived distance from the viewer. In Experiment 1, whole brain group analyses identified bilateral clusters in the superior occipital gyrus (approximately area V3/V3A) that showed parametric adaptation to relative changes in perceived distance. In Experiment 2, retinotopic analyses confirmed that area V3A/B reflected the greatest magnitude of response to monocular changes in perceived distance. In Experiment 3, we report that the functional activations overlap with the occipito-parietal lesions in a patient with impaired distance perception, showing that the same regions monitor implied (2D) and actual (three-dimensional) distance. These data suggest that distance information is automatically processed even when it is task-irrelevant and that this process relies on superior occipital areas in and around area V3A.

Citations

Mar 3, 2011·Experimental Brain Research·Johanna BergmannHeiko Hecht
Nov 5, 2014·Frontiers in Human Neuroscience·Jacqueline C SnowMarian E Berryhill
Jun 29, 2011·Proceedings of the National Academy of Sciences of the United States of America·David Mattijs ArnoldussenAlbert V van den Berg

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