David Bourget (Western Ontario)
David Chalmers (ANU, NYU)
Rafael De Clercq
Jack Alan Reynolds
Learn more about PhilPapers
Vision Research 45 (17):2231-43 (2005)
The relationship between brain activity and conscious visual experience is central to our understanding of the neural mechanisms underlying perception. Binocular rivalry, where monocular stimuli compete for perceptual dominance, has been previously used to dissociate the constant stimulus from the varying percept. We report here fMRI results from humans experiencing binocular rivalry under a dichoptic stimulation paradigm that consisted of two drifting random dot patterns with different motion coherence. Each pattern had also a different color, which both enhanced rivalry and was used for reporting which of the two patterns was visible at each time. As the perception of the subjects alternated between coherent motion and motion noise, we examined the effect that these alternations had on the strength of the MR signal throughout the brain. Our results demonstrate that motion perception is able to modulate the activity of several of the visual areas which are known to be involved in motion processing. More specifically, in addition to area V5 which showed the strongest modulation, a higher activity during the perception of motion than during the perception of noise was also clearly observed in areas V3A and LOC, and less so in area V3. In previous studies, these areas had been selectively activated by motion stimuli but whether their activity reflects motion perception or not remained unclear; here we show that they are involved in motion perception as well. The present findings therefore suggest a lack of a clear distinction between ?processing? versus ?perceptual? areas in the brain, but rather that the areas involved in the processing of a specific visual attribute are also part of the neuronal network that is collectively responsible for its perceptual representation
|Keywords||No keywords specified (fix it)|
|Categories||categorize this paper)|
Setup an account with your affiliations in order to access resources via your University's proxy server
Configure custom proxy (use this if your affiliation does not provide a proxy)
|Through your library|
References found in this work BETA
No references found.
Citations of this work BETA
No citations found.
Similar books and articles
Alvaro Pascual-Leone & Vincent Walsh (2001). Fast Backprojections From the Motion to the Primary Visual Area Necessary for Visual Awareness. Science 292 (5516):510-512.
Juha Silvanto, Alan Cowey, Nilli Lavie & Vincent Walsh (2005). Striate Cortex (V1) Activity Gates Awareness of Motion. Nature Neuroscience 8 (2):143-144.
Robert P. O'Shea & Paul M. Corballis (2001). Binocular Rivalry Between Complex Stimuli in Split-Brain Observers. Brain and Mind 2 (1):151-160.
Ryota Kanai, Farshad Moradi, Shinsuke Shimojo & Frans A. J. Verstraten (2005). Perceptual Alternation Induced by Visual Transients. Perception 34 (7):803-822.
Richard D. Wright & Michael R. W. Dawson (1994). To What Extent Do Beliefs Affect Apparent Motion? Philosophical Psychology 7 (4):471-491.
John D. Pettigrew (2001). Searching for the Switch: Neural Bases for Perceptual Rivalry Alternations. [REVIEW] Brain and Mind 2 (1):85-118.
Frank Tong (2001). Competing Theories of Binocular Rivalry: A Possible Resolution. [REVIEW] Brain and Mind 2 (1):55-83.
T. Kobayashi & K. Kato (2002). Reactivity of Human Cortical Oscillations Reflecting Conscious Perception in Binocular Rivalry. In Kunio Yasue, Marj Jibu & Tarcisio Della Senta (eds.), No Matter, Never Mind. John Benjamins. 33--261.
Fumihiko Taya & Ken Mogi (2005). Spatio-Temporal Dynamics of the Visual System Revealed in Binocular Rivalry. Neuroscience Letters 381 (1-2):63-68.
Added to index2009-01-28
Total downloads19 ( #101,081 of 1,410,136 )
Recent downloads (6 months)1 ( #177,743 of 1,410,136 )
How can I increase my downloads?