Cancelled. To Be Rescheduled. Stephanie Palmer: How behavioral and evolutionary constraints sculpt early visual processing

Mon, Feb 17, 2020, 12:00 pm
Joseph Henry Room Jadwin Hall

While efficient coding has been a successful organizational principle in visual neuroscience, to make a more general theory behavioral, mechanistic, and even evolutionary constraints need to be added to this framework. In our work, we use a mix of known computational goals and detailed behavioral measurements to add constraints to the notion of 'optimality' in vision. Accurate visual prediction is one such constraint. Prediction is essential for interacting fluidly and accurately with our environment because of the delays inherent to all brain circuits. In our work, we explore how our visual system makes these predictions, starting as early as the eye. We use techniques from statistical physics and information processing to assess how efficient, predictive vision emerges from these imperfect component parts. To test whether the visual system performs optimal predictive compression and computation, we compute the past and future stimulus information in populations of retinal ganglion cells, and in the vertical motion sensing system of the fly. In the fly, we anchor our calculations with published measurements of fast evasive flight maneuvers. This survival-critical behavior requires fast and accurate control of flight, which we show can be achieved by visual prediction via a specific wiring motif involving gap junction coupling. Developing a general theory of the evolution of computation is also a current research direction in our group. We use the repeated evolution of tetra-chromatic color vision in butterflies to test hypotheses about whether extant neural computations contain shadows of the evolutionary history of the organism.

Evolutionary dynamics

Fri, Oct 9, 2020, 10:00 am

Evolution is a combination of randomness and selection, in systems with many interacting degree of freedom, and hence a challenging problem in...

Location: Zoom

Stefano Allesina: TBD

Mon, Oct 19, 2020, 12:15 pm
Location: Zoom

Allan Drummond: TBD

Mon, Oct 26, 2020, 12:15 pm
Location: Zoom

Dialogue on droplets with Shana Elbaum-Garfinkle and Stephanie Weber

Thu, Nov 5, 2020, 7:30 pm

Dialogue on droplets:

Shana Elbaum-Garfinkle, ASRC, The CUNY Graduate Center

Stephanie Weber, McGill University...

Location: Zoom

Chromosomes, condensates, and transcriptional control

Fri, Nov 6, 2020, 10:00 am

All cells must control the reading out (“transcription”) of information encoded in their DNA.  

Location: Zoom

Seppe Kuehn: TBD

Mon, Nov 9, 2020, 12:15 pm
Location: Zoom

Kranthi Kiran Mandadapu: TBD

Mon, Nov 23, 2020, 12:15 pm
Location: Zoom

How children learn language with Jenny Saffran

Thu, Dec 3, 2020, 7:30 pm

How children learn language:

Jenny Saffran, University of Wisconsin 

Location: Zoom

Language, learning, and networks

Fri, Dec 4, 2020, 10:00 am

We are in the midst of a revolution driven by models for learning in neural networks.

Location: Zoom