TY  - JOUR
AB  - The visual system is able to recognize body motion from impoverished stimuli. This requires combining
stimulus information with visual priors. We present a new visual illusion showing that one of these
priors is the assumption that bodies are typically illuminated from above. A change of illumination
direction from above to below flips the perceived locomotion direction of a biological motion stimulus.
Control experiments show that the underlying mechanism is different from shape-from-shading and
directly combines information about body motion with a lighting-from-above prior. We further show
that the illusion is critically dependent on the intrinsic luminance gradients of the most mobile parts of
the moving body. We present a neural model with physiologically plausible mechanisms that accounts
for the illusion and shows how the illumination prior might be encoded within the visual pathway. Our
experiments demonstrate, for the first time, a direct influence of illumination priors in high-level motion
vision.
DA  - 2018
DO  - 10.1038/s41598-018-19851-8
LA  - eng
IS  - 1
PY  - 2018
SN  - 2045-2322
T2  - Scientific Reports
TI  - Lighting-from-above prior in biological motion perception
UR  - https://nbn-resolving.org/urn:nbn:de:0070-pub-29188790
Y2  - 2024-11-22T08:30:55
ER  -