G. Stephens

Publications86
h-index21
Citations2,692
Highly Influential Citations126
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Speaker–listener neural coupling underlies successful communication
Verbal communication is a joint activity; however, speech production and comprehension have primarily been analyzed as independent processes within the boundaries of individual brains. Here, we…
Dimensionality and Dynamics in the Behavior of C. elegans
TLDR
It is shown that the space of shapes adopted by the nematode Caenorhabditis elegans is low dimensional, with just four dimensions accounting for 95% of the shape variance, and Stimulus-dependent correlations among the different modes suggest that one can generate more reliable behaviors by synchronizing stimuli to the state of the worm in shape space.
Active sampling and decision making in Drosophila chemotaxis
TLDR
It is shown that chemotaxis in Drosophila melanogaster larvae is an active sampling process analogous to sniffing in vertebrates, and it is suggested that larvalChemotaxis represents an intermediate navigation strategy between the biased random walks of Escherichia Coli and the stereo-olfaction observed in rats and humans.
Optogenetic analysis of synaptic function
TLDR
OptIoN facilitates the analysis of neurotransmission with high temporal precision, in a neurotransmitter-selective manner, possibly allowing future investigation of synaptic plasticity in C. elegans.
A place for time: the spatiotemporal structure of neural dynamics during natural audition.
TLDR
The fMRI time series is characterized through the shape of the voxel power spectrum and finds that the timescales of neural dynamics vary along a spatial gradient, with faster dynamics in early auditory cortex and slower dynamics in higher order brain regions.
Functional structure of cortical neuronal networks grown in vitro.
TLDR
An information-theoretic treatment of action potential time series measured with microelectrode arrays is applied to estimate the connectivity of mammalian neuronal cell assemblies grown in vitro and it is demonstrated that the connectivity maps derived from cultured neural assemblies are similar to other biological networks and display nontrivial structure.
Emergence of long timescales and stereotyped behaviors in Caenorhabditis elegans
TLDR
The stochastic dynamics of the crawling behavior of the nematode Caenorhabditis elegans are used to show that the noise amplitude decreases systematically with increasing time away from food, resulting in longer bouts of forward crawling and suggesting that worms can use noise to modify their locomotory behavior.
Statistical thermodynamics of natural images.
TLDR
The distribution of pixels in small image patches is examined and how to construct the corresponding thermodynamics is shown, finding evidence for criticality in a diverging specific heat, which corresponds to large fluctuations in how "surprising" the authors find individual images.
From Modes to Movement in the Behavior of Caenorhabditis elegans
TLDR
A map is constructed from the dynamics in this shape space to the trajectory of the worm along the agar to illustrate that changes in the continuous dynamics reveal subtle differences in movement strategy that occur among mutants defective in two classes of dopamine receptors.
Resolving coiled shapes reveals new reorientation behaviors in C. elegans
TLDR
This work exploits the reduced space of C. elegans postures to develop a novel tracking algorithm which captures both simple shapes and also self-occluding coils, an important, yet unexplored, component of 2D worm behavior, and demonstrates the precise Ω-turn dynamics of an escape response.
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