Priming of first- and second-order motion: Mechanisms and neural substrates

Campana, Gianluca, Pavan, Andrea and Casco, Clara (2008) Priming of first- and second-order motion: Mechanisms and neural substrates. Neuropsychologia, 46 (2). pp. 393-398. ISSN 0028-3932

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Priming for luminance-modulated (first-order) motion has been shown to rely on the functional integrity of visual area V5/MT Campana, G., Cowey, A., & Walsh, V. (2002). Priming of motion direction and area V5/MT: A test of perceptual memory. Cerebral Cortex, 12, 663-669; Campana, G., Cowey, A., & Walsh, V. (2006). Visual area V5/MT remembers "what" but not "where". Cerebral Cortex, 16, 1766-1770. The high retinotopical organization of this area would predict that direction priming is sensitive to spatial position. In order to test this hypothesis, and to see whether a similar priming mechanism also exists with second-order motion, we tested motion direction priming and its interaction with spatial position with both first- and second-order motion. Indeed, whereas a number of studies have pinpointed the specific mechanisms and neural substrates for these two kinds of motion perception that appear to be (partially) non-overlapping (i.e., Lu, Z. L., & Sperling, G. (2001). Three-systems theory of human visual motion perception: Review and update. Journal of the Optical Society of America A, 18, 2331-2370; Vaina, L. M., & Soloviev, S. (2004). First-order and second-order motion: Neurological evidence for neuroanatomically distinct systems. Progress in Brain Research, 144, 197-212), the mechanisms and neural substrates mediating implicit memory for first- and second-order motion are still unknown. Our results indicate that priming for motion direction occurs not only with first-order but also with second-order motion. Priming for motion direction is position-sensitive both with first- and second-order motion, suggesting for both processes a locus of representation where retinotopicity is still maintained, that is within the V5/MT complex but earlier than MST. Cross-order motion priming also exists but is not sensitive to spatial position, suggesting that the locus where processing of first- and second-order motion converge is situated in MST or beyond. © 2007 Elsevier Ltd. All rights reserved.

Additional Information:Received 20 March 2007, Revised 23 July 2007, Accepted 26 July 2007, Available online 2 August 2007
Keywords:accuracy, article, controlled study, depth perception, human, human experiment, implicit memory, movement perception, reaction time, visual acuity, Adult, Arousal, Cues, Discrimination (Psychology), Humans, Light, Motion Perception, Neurons, Pattern Recognition, Visual, Photic Stimulation, Reference Values, Signal Transduction, Space Perception, Visual Cortex
Subjects:C Biological Sciences > C800 Psychology
Divisions:College of Social Science > School of Psychology
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ID Code:15503
Deposited On:15 Oct 2014 18:46

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