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Seminar✓ Recording AvailableNeuroscience

Time as a continuous dimension in natural and artificial networks

Marc Howard

Dr

Boston University

Schedule
Wednesday, May 4, 2022

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Schedule

Wednesday, May 4, 2022

12:00 AM America/New_York

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Host: Timing Research Forum

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Event Information

Domain

Neuroscience

Original Event

View source

Host

Timing Research Forum

Duration

70 minutes

Abstract

Neural representations of time are central to our understanding of the world around us. I review cognitive, neurophysiological and theoretical work that converges on three simple ideas. First, the time of past events is remembered via populations of neurons with a continuum of functional time constants. Second, these time constants evenly tile the log time axis. This results in a neural Weber-Fechner scale for time which can support behavioral Weber-Fechner laws and characteristic behavioral effects in memory experiments. Third, these populations appear as dual pairs---one type of population contains cells that change firing rate monotonically over time and a second type of population that has circumscribed temporal receptive fields. These ideas can be used to build artificial neural networks that have novel properties. Of particular interest, a convolutional neural network built using these principles can generalize to arbitrary rescaling of its inputs. That is, after learning to perform a classification task on a time series presented at one speed, it successfully classifies stimuli presented slowed down or sped up. This result illustrates the point that this confluence of ideas originating in cognitive psychology and measured in the mammalian brain could have wide-reaching impacts on AI research.

Topics

Weber-Fechner scaleartificial networksartificial neural networksbehavioural effectsconvolutional neural networkfiring ratememory experimentsneural representationstemporal receptive fieldstimetime constants

About the Speaker

Marc Howard

Dr

Boston University

Contact & Resources

Personal Website

www.bu.edu/psych/profile/marc-howard-ph-d/

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