Speaker–listener neural coupling underlies successful communication
- G. Stephens, Lauren J. Silbert, U. Hasson
- Psychology, PhysicsProceedings of the National Academy of Sciences
- 26 July 2010
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
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
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
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.
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.
- L. Bettencourt, G. Stephens, Michael I. Ham, G. Gross
- Biology, Computer SciencePhysical review. E, Statistical, nonlinear, and…
- 23 February 2007
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
- G. Stephens, Matthew M Bueno de Mesquita, W. Ryu, W. Bialek
- BiologyProceedings of the National Academy of Sciences
- 18 April 2011
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.
From Modes to Movement in the Behavior of Caenorhabditis elegans
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.
Statistical thermodynamics of natural images.
- G. Stephens, T. Mora, G. Tkačik, W. Bialek
- Environmental Science, PhysicsPhysical Review Letters
- 17 June 2008
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.
Bias, Belief and Consensus: Collective opinion formation on fluctuating networks
It is shown that active network maintenance exposes agents to confirmation bias, the tendency to confirm one's beliefs, and how this bias affects collective opinion formation, and this suggests a novel avenue for large-scale opinion manipulation.