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Heads of Laboratories

Head shot of George Reeke Jr.
George N. Reeke Jr., Ph.D.
Associate Professor
Laboratory of Biological Modeling
George.Reeke@rockefeller.edu

Signals exchanged between cells contribute to the complexity that makes the behavior of biological systems hard to predict. Dr. Reeke employs computer simulations to investigate how the components of biological systems work together to carry out complex functions. He is specifically interested in modelling neuronal systems in order to better understand how physical phenomena within them give rise to perception, motor control, and memory.

As the nervous system develops, it must acquire adaptive behavior through interactions with the environment. Dr. Reeke’s research simulates neural systems based on experimental neurophysiology with simulated or real sensors and locomotor organs and then challenges those systems to perform various tasks, shedding light on sensory integration, perceptual categorization, motor control, and aspects of memory in normal and damaged or diseased brains. The models have shown how the ability to recognize objects and events in the environment can arise in the nervous system as a result of the operation of selective processes guided by innate value systems. Dr. Reeke’s research indicates that there is no need for built-in representational codes or computational algorithms, nor for feedback of error signals from omniscient external teachers. The results call into question the popular theory that the brain is a kind of computer.

Areas of particular interest in Dr. Reeke’s lab are perception, control of locomotion, and the development of analytic tools appropriate for the characterization of these activities in space and time. He is focusing on neural mechanisms for the recognition and recall of temporal patterns, which are of fundamental importance for planning and navigation, language, and music. The lab has developed novel information-theoretic measures, based on the temporal intervals between events of interest, that help to quantitate the temporal characteristics of the signals exchanged among neurons and the spatiotemporal discharge activity of neuronal assemblies.

Dr. Reeke has shown that these same measures can be used to analyze data obtained from behavioral experiments with animals. In a collaborative project with Rockefeller’s Donald W. Pfaff, Dr. Reeke helped measure the contribution of estrogens to exploratory behavior in female mice. The method could also be adapted to measure the contribution of a range of genes to behavior as well as to understand the effect of different genotypes or pharmacological manipulations on behavior.

Dr. Reeke’s lab has also developed a composite approach to modeling neurons in which the degree of detail employed in modeling different membrane conductances is adapted to the dynamical complexity of each neuron. For example, analysis of a model cerebellar Purkinje cell shows that when both the rate and the timing of a stimulus are varied, novel cell discharge behavior emerges. Studies of large-scale systems incorporating these data provide a greater understanding of how different types of neurons in both normal and diseased brains function at the integrated system level. These methods have been applied by members of the lab to study nonclassical responses of cells in the primary visual cortex, the process by which juvenile birds learn their songs, how general anesthetics affect the activities of neuronal clusters in the cerebral cortex, and the generation of descriptive models of sensorimotor contingencies and their relationship to reward in the cerebellum and other brain regions.


EDUCATION

B.S. in chemistry, 1964
California Institute of Technology

M.A. in chemistry, 1966
Ph.D. in physical chemistry, 1969
Harvard University

POSTDOC

Harvard University, 1969–1970

POSITIONS

Assistant Professor, 1970–1976
Associate Professor, 1976–1987
Associate Professor with Tenure, 1987–
The Rockefeller University

AWARDS

Alfred P. Sloan Research Fellowship, 1975

SELECTED PUBLICATIONS

Watters, N. and Reeke, G.N. Neuronal spike train entropy estimation by history clustering. Neural Comput. 26, 1840–1872 (2014).

Piëch, V. et al. Network model of top-down influences on local gain and contextual interactions in visual cortex. Proc. Natl. Acad. Sci. U.S.A. 110, E4108–E4117 (2013).

Storer, K.P. and Reeke, G.N. γ-Aminobutyric acid receptor type A receptor potentiation reduces firing of neuronal assemblies in a computational cortical model. Anesthesiology 117, 780–790 (2012).

Quinkert, A.W. et al. Quantitative descriptions of generalized arousal, an elementary function of the vertebrate brain. Proc. Natl. Acad. Sci. U.S.A. 108, 15617–15623 (2011).

Seth, A.K. et al. Theories and measures of consciousness: An extended framework. Proc. Natl. Acad. Sci. U.S.A. 103, 10799–10804 (2006).


Dr. Reeke is a faculty member in the David Rockefeller Graduate Program and the Tri-Institutional M.D.-Ph.D. Program.