A Brown University Research Group

Research

Active projects

2014 – 2016 Scaling up computational models of visual processing in cortex

The goal of this research is to identify functionally-relevant biophysically-plausible computational mechanisms beyond those currently implemented in existing models of the visual cortex and other deep learning architectures. Rather than dealing with more realistic but elaborate spiking neuron models, we propose to develop novel mathematical idealizations that naturally extends current system-level models of vision and related deep networks while still being amenable to many learning algorithms and interpretable in the context of biophysical mechanisms. Our approach, which consists in building phenomenological models of biophysically-realistic operations to scale up computational models of the visual cortex (and other deep learning nets) will thus help bridge a major gap between detailed biophysical models of spiking neurons and state-of-the-art machine learning and computer vision.

This work is funded by DARPA young investigator award (IIS-1252951).

2013 – 2018 Computational mechanisms of rapid visual categorization

The goal of this research is to identify the perceptual principles and model the neural mechanisms underlying rapid visual categorization. By forcing processing to be fast, rapid visual categorization paradigms help isolate the very first pass of visual information before more complex visual routines take place. Hence, understanding ‘vision at a glance’ is arguably a necessary first step before studying natural everyday vision where eye movements and attentional shifts are known to play a key role. Specifically, this proposal will lead to the development of a computational neuroscience model of rapid visual recognition in the primate visual system, which is both consistent with physiological properties of cells in the visual cortex and able to predict behavioral responses (both correct and incorrect responses as well as reaction times) from human participants across a range of conditions.

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This work is funded by NSF early career award (IIS-1252951).

Past projects

2011 – 2014 Towards a biologically-inspired vision system for the control of navigation in complex environments

The goal of this project is to identify the perceptual principles and model the neural mechanisms responsible for the visual control of primate navigation as a novel approach to navigation for ground vehicles with minimal sensing requirements. Specifically we will develop a neurally plausible, quantitative model of visual perception, which by incorporating bottom-up and top-down cortical connectivity as well as mechanisms of 3D shape and motion processing, should ultimately describe human performance in navigation tasks as well as the underlying circuits and neural mechanisms.

This work was supported by ONR (N000141110743).

2011 – 2013 Automated monitoring and analysis of human and animal behavior

Neurobehavioural analysis of mouse phenotypes requires the monitoring of mouse behaviour over long periods of time. We are currently developing trainable computer vision systems enabling the automated analysis of complex behaviors in mouse, monkey and humans.  Link to the Rodent Neuro-Developmental Behavioral testing facility website here.

This work was supported by the Robert J. and Nancy D. Carney Fund for Scientific Innovation.

2010 – 2011 Towards a human-level neuromorphic artificial visual system

The goal of this project is to create intelligent general-purpose cognitive vision algorithms inspired from the primate brain to alleviate the limitations of human-based analysis of complex visual scenes. The human brain is arguably the most advanced information processing device in existence, with a large fraction of its computing power devoted to sensory processing. Despite the importance of image processing for the control of animal behavior, after decades of intensive research in the computer vision communities, artificial vision systems remain poor cousins to their biological counterparts. The assumption underlying this research is that a concerted effort to understand and emulate the information-processing strategies used in biological sensory systems will lead to substantial near-term technological benefits. Importantly, based on our own experience with studying mechanisms of image formation, attention, and object recognition in the primate brain, we believe that a quantum leap advance is only possible through research and development of a new breed of neuroscience-inspired algorithms.

This work was supported by DARPA (N10AP20013).

 

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