Decoding of V1 responsiveness to component motion predicts higher-level responsiveness to pattern motion
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1
Otto-von-Guericke University Magdeburg, Dept of Cognitive Biology - Institute of Biology, Germany
We study the perceptual representation and model the neural representation of pattern motion. Lacking quantitative characterizations of neuronal responsiveness in area MT, we derive theoretical predictions from the responsiveness of motion-selective neurons in area V1, which are comparatively well characterized (Geisler & Albrecht, 1997). Given a quantitative model of responsiveness (tuning and variability) to component motion, we have previously predicted the responsiveness (tuning and variability) to pattern motion, assuming statistically efficient integration of Fisher information. These theoretical results predict that sensitivity to the speed and direction of pattern motion should vary with the constitutive component motions (Lehmann, Pastukhov & Braun, ECVP 2011). We now report psychophysical threshold measurements that quantitatively confirm these predictions. Five observers viewed composite arrays of two types of component Gabor-motion wavelets, reporting either the direction or the speed of pattern motion (t2AFC). To reveal the differential contribution of different motion components, we varied the angle between component wavelets. Thresholds for direction of pattern motion decrease, whereas thresholds for speed of pattern motion increase, with the angle between component wavelets. In conclusion, we can predict neural responsiveness at the level of pattern motion (presumably in area MT) from psychophysical measurements and from neural responsiveness at the level of component motion (area V1). These predictions make no assumptions about neural circuits but simply assume statistically efficient integration of Fisher information.
References
Geisler, W. S. and Albrecht, D. G. (1997) Visual cortex neurons in monkeys and cats: Detection, discrimination and identification. Visual Neuroscience, 14, 897-919.
Lehmann, S., Pastukhov, A. and Braun, J. (2011) Differential component contributions to pattern motion. Perception 40 ECVP Abstract Supplement, 133
Keywords:
component motion,
Fisher information,
Motion Perception,
pattern motion,
V1 decoding
Conference:
Bernstein Conference 2012, Munich, Germany, 12 Sep - 14 Sep, 2012.
Presentation Type:
Poster
Topic:
Sensory processing and perception
Citation:
Lehmann
S,
Pastukhov
A and
Braun
J
(2012). Decoding of V1 responsiveness to component motion predicts higher-level responsiveness to pattern motion.
Front. Comput. Neurosci.
Conference Abstract:
Bernstein Conference 2012.
doi: 10.3389/conf.fncom.2012.55.00190
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Received:
11 May 2012;
Published Online:
12 Sep 2012.
*
Correspondence:
Ms. Stephanie Lehmann, Otto-von-Guericke University Magdeburg, Dept of Cognitive Biology - Institute of Biology, Magdeburg, 39120, Germany, stephanie.lehmann@ovgu.de
Prof. Jochen Braun, Otto-von-Guericke University Magdeburg, Dept of Cognitive Biology - Institute of Biology, Magdeburg, 39120, Germany, jochen.braun@ovgu.de