Browsing Cognitive & Neural Systems by Author "Cohen, Michael"

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Browsing Cognitive & Neural Systems by Author "Cohen, Michael"

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  • AIRSTREAM: A Neural Network Model of Auditory Scene Analysis and Source Segregation
    Grossberg, Stephen; Govindarajan, Krishna; Wyse, Lonce; Cohen, Michael (Boston University Center for Adaptive Systems and Department of Cognitive and Neural Systems, 2003-06)
    Multiple sound sources often contain harmonics that overlap and may be degraded by environmental noise. The auditory system is capable of teasing apart these sources into distinct mental objects, or streams. Such an "auditory ...
  • Changes in the McGurk Effect across Phonetic Contexts. I. Fusions
    Hampson, Michelle; Guenther, Frank; Cohen, Michael (Boston University Center for Adaptive Systems and Department of Cognitive and Neural Systems, 1999-11)
    The McGurk effect has generally been studied within a limited range of phonetic contexts. With the goal of characterizing the McGurk effect through a wider range of contexts, a parametric investigation across three different ...
  • A Model for the Genesis of Arterial Pressure Mayer Waves from Heart Rate and Sympathetic Activity
    Myers, Christopher; Cohen, Michael; Eckberg, Dwain; Taylor, J. Andrew (Boston University Computer Science Department, 2001-04)
    Both theoretic models and cross-spectral analyses suggest that an oscillating sympathetic nervous outflow generates the low frequency arterial pressure fluctuations termed Mayer waves. Fluctuations in heart rate also have ...
  • Modeling the Contributions of the Exocytotic Machinery and Receptor Desensitization to Short- and Long-Term Plasticity of Synapses Between Neocortical Pyramidal Neurons
    Okatan, Murat; Cohen, Michael (Boston University Computer Science Department, 2001-03)
    Short-term synaptic depression (STD) refers to the progressive decrease in synaptic efficacy during a spike train. This decrease may be explained in terms of presynaptic and postsynaptic processes, such as a decrease in ...
  • Model of the Classification of English Vowels by Spanish Speakers
    Husaine, Fatima; Negishi, Michiro; Cohen, Michael; Guenther, Frank (Boston University Center for Adaptive Systems and Department of Cognitive and Neural Systems, 1999-10)
    A number of models of single language vowel classification based on formant representations have been proposed. We propose a new model that explicitly predicts vowel perception by second language (L2) learners based on the ...
  • Neural Dynamics of Perceptual Order and Context Effects for Variable-Rate Speech Syllables
    Boardman, Ian; Grossberg, Stephen; Myers, Christopher; Cohen, Michael (Boston University Center for Adaptive Systems and Department of Cognitive and Neural Systems, 1998-06)
    How does the brain extract invariant properties of variable-rate speech? A neural model, called PHONET, is developed to explain aspects of this process and, along the way, data about perceptual context effects. For example, ...
  • Neural Dynamics of Phonetic Trading Relations for Variable-Rate CV Syllables
    Boardman, Ian; Grossberg, Stephen; Cohen, Michael (Boston University Center for Adaptive Systems and Department of Cognitive and Neural Systems, 1994-12)
    The perception of CV syllables exhibits a trading relationship between voice onset time (VOT) of a consonant and duration of a vowel. Percepts of [ba] and [wa] can, for example, depend on the durations of the consonant and ...
  • Neural Dynamics of Variable Rate Speech Categorization
    Grossberg, Stephen; Boardman, Ian; Cohen, Michael (Boston University Center for Adaptive Systems and Department of Cognitive and Neural Systems, 1994-12)
    What is the neural representation of a speech code as it evolves in real time? A neural model of thiss process, called the ARTPHONE model, is developed to quantitatively simulate data concerning segregation and integration ...
  • A Neural Network Model of Auditory Scene Anaysis and Source Segregation
    Govindarajan, Krishna; Grossberg, Stephen; Wyse, Lonce; Cohen, Michael (Boston University Center for Adaptive Systems and Department of Cognitive and Neural Systems, 1994-12)
    In environments with multiple sound sources, the auditory system is capable of teasing apart the impinging jumbled signal into different mental objects, or streams, as in its ability to solve the cocktail party problem. A ...
  • Variable Rate Working Memories for Phonetic Categorization and Invariant Speech Perception
    Boardman, Ian; Cohen, Michael; Grossberg, Stephen (Boston University Center for Adaptive Systems and Department of Cognitive and Neural Systems, 1993-01)
    Speech can be understood at widely varying production rates. A working memory is described for short-term storage of temporal lists of input items. The working memory is a cooperative-competitive neural network that ...

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