CAS/CNS Technical Reports

 
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URI: http://hdl.handle.net/2144/1897

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  • Contrast-sensitive perceptual grouping and object-based attention in the laminar circuits of primary visual cortex 

    Grossberg, Stephen; Raizada, Rajeev D.S. (Boston University Center for Adaptive Systems and Department of Cognitive and Neural Systems, 1999-03)
    Recent neurophysiological studies have shown that primary visual cortex, or Vl, does more than passively process image features using the feedforward filters suggested by Hubel and Wiesel. It also uses horizontal interactions ...

  • A laminar cortical model of stereopsis and 3D surface perception: Closure and da Vinci stereopsis 

    Cao, Yongqiang; Grossberg, Stephen (Boston University Center for Adaptive Systems and Department of Cognitive and Neural Systems, 2004-09)
    A laminar cortical model of stereopsis and 3D surface perception is developed and simulated. The model describes how monocular and binocular oriented filtering interact with later stages of 3D boundary formation and surface ...

  • PointMap: A real-time memory-based learning system with on-line and post-training pruning 

    Kopco, Norbert; Carpenter, Gail (Boston University Center for Adaptive Systems and Department of Cognitive and Neural Systems, 2002-12)
    A memory-based learning system called PointMap is a simple and computationally efficient extension of Condensed Nearest Neighbor that allows the user to limit the number of exemplars stored during incremental learning. ...

  • Temporal Dynamics of Decision-Making during Motion Perception in the Visual Cortex 

    Grossberg, Stephen; Pilly, Praveen K. (Boston University Center for Adaptive Systems and Department of Cognitive and Neural Systems, 2008-02)
    How does the brain make decisions? Speed and accuracy of perceptual decisions covary with certainty in the input, and correlate with the rate of evidence accumulation in parietal and frontal cortical "decision neurons." A ...

  • A Dopamine-Acetylcholine Cascade: Simulating Learned and Lesion-Induced Behavior of Striatal Cholinergic Interneurons 

    Tan, Can Ozan; Bullock, Daniel (Boston University Center for Adaptive Systems and Department of Cognitive and Neural Systems, 2007-02)
    The "teaching signal" that modulates reinforcement learning at cortico-striatal synapses may be a sequence composed of an adaptively scaled DA burst, a brief ACh burst, and a scaled ACh pause. Such an interpretation is ...

  • Laminar Cortical Dynamics of 3D Surface Perception: Stratification, transparency, and Neon Color Spreading 

    Grossberg, Stephen; Yazdanbakhsh, Arash (Boston University Center for Adaptive Systems and Department of Cognitive and Neural Systems, 2004-01)
    How does the laminar organization of cortical circuitry in areas VI and V2 give rise to 3D percepts of stratification, transparency, and neon color spreading in response to 2D pictures and 3D scenes? Psychophysical experiments ...

  • How Does Binocular Rivalry Emerge from Cortical Mechanisms of 3D Vision? 

    Grossberg, Stephen; Yazdanbakhsh, Arash; Cao, Yongqiang; Swaminathan, Guru (Boston University Center for Adaptive Systems and Department of Cognitive and Neural Systems, 2007-07)
    Under natural viewing conditions, a single depthful percept of the world is consciously seen. When dissimilar images are presented to corresponding regions of the two eyes, binocular rivalyr may occur, during which the ...

  • Intersubject Regularity in the Intrinsic Shape of Human V1 

    Hinds, Oliver P.; Polimeni, Jonathan R.; Rajendran, Niranjini; Balasubramanian, Mukund; Wald, Lawrence L.; Rosas, H. Diana; Frosch, Matthew P.; Augustinack, Jean C.; Wiggins, Graham; Potthast, Andreas; Fischl, Bruce; Schwartz, Eric L. (Boston University Center for Adaptive Systems and Department of Cognitive and Neural Systems, 2007-01-16)
    Previous studies have reported considerable intersubject variability in the three-dimensional geometry of the human primary visual cortex (V1). Here we demonstrate that much of this variability is due to extrinsic geometric ...

  • Self-Organizing Hierarchical Knowledge Discovery by an ARTMAP Image Fusion System 

    Carpenter, Gail; Martens, Siegfried; Ogas, Ogi (Boston University Center for Adaptive Systems and Department of Cognitive and Neural Systems, 2004-01)
    Classifying novel terrain or objects front sparse, complex data may require the resolution of conflicting information from sensors working at different times, locations, and scales, and from sources with different goals ...

  • Neuropeptide Co-Release with Gaba May Explain Functional Non-Monotonic Uncertainty Responses in Dopamine Neurons 

    Tan, Can Ozan; Bullock, Daniel (Boston University Center for Adaptive Systems and Department of Cognitive and Neural Systems, 2007-02)
    Co-release of the inhibitory neurotransmitter GABA and the neuropeptide substance-P (SP) from single axons is a conspicuous feature of the basal ganglia, yet its computational role, if any, has not been resolved. In a new ...

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