Computational Navigation: Lessons from the Rat

A Rice/UTHSC-H joint effort to build a biophysically and anatomically accurate computational model of the rat hippocampal formation with which to evaluate existing, and construct novel, cognitive theories of spatial navigation.

Senior Personnel: Steve Cox, Jim Knierim, Harel Shouval, Paul Smolen, and Danny Sorensen.

Funding: We are pleased to acknowledge the generous support of the Sheafor/Lindsay Fund via the ERIT program at Rice's Computer and Information Technology Institute CITI .

Courses: Intro at Rice/Baylor . Advanced at UTHSC-H

Activities:
Fall 08 Seminar: VIGRE, CAAM 499 Sec 1. Tues. 4-5:30 in BROWN 146
Summer 08 Work
Spring 08 Seminar: VIGRE, CAAM 499 Sec 1. Tuesday 4-6pm in HZ 119
Fall 07 Seminar: VIGRE, CAAM 499 Sec 1. Wednesday 10-11am in DH 3110
Summer 07 Work
Spring 07 Seminar: VIGRE, CAAM 499 Sec 1. Wednesday 5-6pm in KH 101
Fall 06 Seminar: VIGRE, CAAM 499 Sec 1. Wednesday 5-6pm in KH 105
Summer 06 Work
Spring 06 Seminar: VIGRE, CAAM 499 Sec 1.

Code

Resources



Fall 08 Seminar Participants: Jay Raol, Tony Kellems, Jim Wang, Eva Dyer, Katherine Ward, Eric Reinelt, Mingbo Cai, Ben Leung, Ryan George, Aneesh Mehta.
Theme: Model reduction at the Network Level

+ September 2: Steve Cox will introduce Rate Models for Conductance-Based Cortical Neuronal Networks.
+ September 9: Jim Wang will reproduce the single cell fI curves, section 2.1. His codes are here
+ September 16: Katie Ward will cover the network setup, section 2.2.
+ September 23: Katie Ward will cover the hypercolumn model, section 2.3. Her codes are here
+ September 30: Katie Ward will finish section 2 and Eva Dyer will start section 3.
+ October 7: Eva Dyer, sections 3 and 4.
+ October 14: Fall Break.
+ October 21: Mingbo Cai, section 5.1 and appendix B. His codes are here.
+ October 28: Continue section 5.


Spring 08 Seminar Participants: Chris Conner, Jay Raol, Tony Kellems, Derrick Roos, Jim Wang, Eva Dyer, Paul Smolen, Michell Bettelheim, Katherine Ward.

+ January 22: Derrick will step us through his final cell assembly project. If time remains Cox will follow up with an overview of Volman et al.
The best general reference for neuronal calcium signaling is Berridge.

+ January 29: Jay will step us through Friel's work on calcium oscillations.

+ February 5: Jay will step us through Gabso and Neher's work on calcium diffusion and buffering.



Fall 07 Seminar Participants: Chris Conner, Jay Raol, Tony Kellems, Derrick Roos, Charlie Peck, Jim Wang, Darren DeFreeuw, Eva Dyer, Paul Smolen, Michell Bettelheim, Katherine Ward.

+ August 29: Cox, Introduction to Cell Assemblies. Harris et al. and supplement. Background reading by Scott

+ September 5: Charlie Peck, Palm Reading.

+ September 12: Tony Kellems and Jay Raol Palm Reading.

+ September 19: Derrick and Darren Palm Reading.

+ September 24: Chris Conner. Return to Harris et al.

+ September 26: Tony Kellems. Harris supplement.

+ October 3: Jay Raol. Harris supplement. Exact gradient and Hessian.

+ October 10: Jay and Tony. Harris supplement.

+ October 17: Jay and Tony. Harris supplement.

+ October 24: Cox. The thesis of Fransen.

+ October 31: Roos: The single cell models of Fransen.

+ November 7: Conner: The learning rule of Fransen via Lansner and Ekeborg

+ November 14: DeFreeuw and Conner: More on Lansner and Ekeborg

+ November 21: Cox: More on Lansner and Ekeborg. Small example with working code.

+ November 28: All: Large examples from Lansner and Ekeborg.

+ December 5: All: Large examples from Lansner and Ekeborg and (clean copy of) Lansner and Fransen



Spring 07 Seminar Participants: Paul Anzel, Chris Conner, Sam Feng, Ray Hwong, Toby Isaac, Neel Kishan, Brad Peercy, Jay Raol, Manivel Rengasamy, Francesco Savelli, Nick Stepankiw, Nan Xiao

+ January 10: Cox, on a Fast Network Solver of Rangan and Cai. Overview and explicit solution of the conductance equation.

+ January 17: Raol, on the Low mobility of Ca buffers in axons Gabso, Neher and Spira.

+ January 24: Cox, Resume Rangan and Cai. Approximate solution of the voltage equation and Algorithm 8.1.

+ January 31: Cox, Resume Rangan and Cai. Networks and Spike-Spike Correction via algorithm 9.1. code.

+ February 7: Chris Conner

+ February 14: Paul Smolen, UTH

+ February 21: Sam Feng

+ February 28: Toby Isaac. PETSc Intro
PETSc and CA3
Summer 06 work

+ March 7: Brad Losavio, BCM, Non-linear synaptic summation in dendrites.

+ March 14: Jay Raol, Calcium Imaging

+ March 21: Giri Kalamangalam, Clinical Epilespsy and Computational Neuroscience

+ March 28: Tony Kellems, Integrate and Fire

+ April 4: Steve Cox, Localization of Potassium Currents Schaefer, Helmstaeder, Sakmann and Korngreen

+ April 11: Chris Conner, Spike sorting

+ April 18: Model Reduction Lall, Marsden and Glavaski



Fall 06 Seminar Participants: Paul Anzel, Chris Conner, Sam Feng, Ray Hwong, Toby Isaac, Neel Kishan, Brad Peercy, Jay Raol, Manivel Rengasamy, Francesco Savelli, Nick Stepankiw, Nan Xiao

+ September 6: Cox and Feng. Calcium Signaling and Inverse Problems.

+ Septmeber 13: Kellems and Isaac. CA3 models.

+ September 20: Cox and Feng. Adjoint Methods via the notes of Matthias Heinkenschloss.

+ September 27: Jim Knierim. Lab/modeling Overview.

+ October 4: Chris Conner. Spike Discrimination.

+ October 11: Sam Feng. Computing the Hessian of the misfit function.

+ October 18: Nan Xiao. The branched cable equation and the finite element method.

+ October 25: Tony Kellems. Accurate solution to Integrate and Fire models.

+ November 1: Paul Smolen.

+ November 8: Toby Isaac. PETSc survey.

+ November 15: Toby Isaac. Extended Pinsky-Rinzel nets on PETSc



Summer 06 Work Groups:

Network: Computation and Visualization
(2C) Toby Isaac, Richard Hall
(IaF) Nick Stepankiw,
Tony Kellems
(Pop) Jay Raol

Knierim Lab, UTH: Data recording and analysis
Chris Conner

Neuronal Calcium Signaling
With Cox and Saggau at BCM: Sam Feng, Nan Xiao, Ray Hwong,
Resources: Saggau , Parker 1 Parker 2 Parker 3
Summer poster , Summer Sam and Ray report
With Peercy at Rice: Lucca Sabbatini



Spring 06 Seminar Participants: Paul Anzel, Sha'kia Boggan, Andy Bost, Jesse Chan, Sam Feng, Toby Isaac, Neel Kishan, Brad Peercy, Jay Raol, Francesco Savelli, Nick Stepankiw, Nan Xiao

+ January 11: Cox. Specify project goals and introduce Samsanovich and Ascoli
Assignment Due 1/19. One page summary of introductory chapter on The Neurobiology of Spatial Behavior.

+ January 19: Cox. The Pathfinding Algorithm of S&A. Review theta rhythm and phase precession. Discuss their code. This is a very high level representation - for there don't appear to be any neurons in sight. One challenge is to build neuronal nets that in fact exhibit theta waves and phase precession. Chapter 7 in Traub and Miles is a great place to start. Beyond that, for theta I recommend this paper of Wang and for phase precession this paper of Magee. These notions are brought together in an Integrate & Fire paper of Tsodyks et. al that exploits the experimental findings of Skaggs et. al.
Assignment Due 1/26. Build a bigger (at least 10-by-10) maze and suppress the interactive aspect of samasc.m and wrap it in a driver that produces a histogram like S&A figure 3C. Submit hard copies of code and histogram. You might like the hist command in matlab. At this early phase you may not work together. Ask Cox and/or Peercy for help.

+ January 26: Brad Peercy. Putting neurons into the maze. A careful look at theta waves and phase precession as discussed in the above papers of Skaggs et. al and Tsodyks et. al.

+ February 2: Andy & Jesse. Mechanisms that lead to asymmetry in Tsodyks may come from Head Direction and or Grid cells.

+ February 9: Neel & Sha'Kia. Integrate and Fire nets in C and MPI on the Rice Terascale cluster.
Assignment Due 2/16. Two page summary of Wang .

+ February 16: Toby will lead discussion of rythmogenesis in the CA3 model of Pinsky and Rinzel.

+ February 23: Sam will lead discussion of rythmogenesis in the CA3 model of Traub and Miles. Here are notes on the prologue and chapter 5 and chapter 6 .

+ March 2: Moser speaks at UTH (MSB 3.001) on Grid Cells. Meet at the (Non-Magregor) stop light on the jogging path between Sid & Lovett at 3:40 pm.

+ March 9: Jay will lead discussion of An effective kinetic representation of fluctuation driven neuronal netwoks.

+ March 16: Spring Break and, more importantly, Brain Awareness Week.

+ March 23: Sam will discuss chapters 6 and 7 of Traub and Miles. Raol and Cox will counter with a population model of Nykamp and Tranchina

+ March 30: Cox and Raol continue the disection of Nykamp and Tranchina.

+ April 6: Spring recess, poster prep.

+ April 13: Cox and Raol continue the disection of Nykamp and Tranchina. The CA3 population model of the Budapest group is comprised of Part 1 and Part 2.


Code:

+ Single Cell Solver and Viewer by Nan Xiao
Background Reading
gzipped tar ball of matlab code
To unpack type tar -xvvf nxball.tar.gz from Unix prompt.
To run type cellscript_act from matlab prompt.

+ Parallel Integrate and Fire Code by Tony Kellems PIAF

+ The Cell Assembly Network of Lansner and Fransen as reconstructed by Derrick Roos. See Derrick's connexions module for details and demo.

+ The Pinsky & Rinzel CA3 network of Chan & Isaac

+ The MEC/CA3 simulator of Katie Ward. See her Master's Thesis for background, and her Connexions Module for details on the grid cell model.


Resources:

+ Cray XD1
+ Rice Terascale Cluster Home
+ The Hippocampus as a Cognitive Map by O'keefe and Nadel.
+ GCC for Theoretical & Computational Neuroscience
+ Duke Southampton Archive of Neuronal Morphology
+ Rice Baylor Archive of Neuronal Morphology
+ Computational Neuroanatomy of the Hippocampus
+ Levy Lab at UVa.
+ Budapest Computational Neuroscience Group
+ NeuroJet