Dendrites Impact the Encoding Capabilities of the Axon Guy Eyal and Idan Segev Hebrew University H. Mansvelder and C. De Kock (Amsterdam) Journal of Neuroscience.

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Presentation transcript:

Dendrites Impact the Encoding Capabilities of the Axon Guy Eyal and Idan Segev Hebrew University H. Mansvelder and C. De Kock (Amsterdam) Journal of Neuroscience 2014

Motivation 1.F. Wolf vs. D. McCormick debate on origin of soma AP kinkiness McCormick, Shu Yu, 2007 Yu, Shu McCormick, 2008

Motivation 2. Brunel and colleagues proving that AP onset rapidness markedly affects the tracking capability of input modulations by axonal spikes (and further experimental work by Michele Giugliano, Fred Wolf and others Ilin, Malyshev, Wolf and Volgushev, 2013

Spike Initiation Point And Onset Rapidness In The Axon partial electrical decoupling from the large impedance load (“current loss”)

Spike Initiation Point And Onset Rapidness In The Axon partial electrical decoupling from the large impedance load (“current loss”) “Kinkier” spikes at the soma

Spike Initiation Point And Onset Rapidness In The Axon Rapidness at the SIP is critical for tracking input modulations

Dependence Of AP Onset Rapidness In The Axon On The Dendritic Load Same active properties

Tracking Capability Of Modulated Input Via Spike Output Depends On Dendritic Load

Impact Of Dendritic Load On Effective System Time Constants (And Cutoff Freq. (In Passive Case)) IN THE TIME DOMAIN 1D Passive Cable Equation Rall’s General Solution(1969):

Impact Of Dendritic Load On Effective System Time Constants (And Cutoff Freq. (In Passive Case)) IN THE TIME DOMAIN 1D Passive Cable Equation Rall’s General Solution(1969): IN THE FREQ DOMAIN

Why Dendritic Load Decrease The Effective System Time Constant?

Dissecting The Two Effects Of Dendritic Load On Spike Tracking Capability (Passive Filtering And Change In Ap Onset Rapidness)

Tracking Capability Of Human Vs. Mouse L2/3 Pyramidal Cells

Ongoing research in the lab Eyal Gal Network patterns in cortical microcircuits connectivity Ohad Dan Computation of visual information in the dendritic trees of the fly. Yoav Tal orientation selectivity in mouse v1 Oren Amsalem The effect of gap junction on brain microcircuits

THANKS