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NIPS 2007 Report: Lunch with Roby Jacobs

Author:movellan @ December 3rd, 2007 Leave a Comment

Roby Jacobs is working on some really cool work on motor control.

  • He described an experiment in which subjects had to control a joystick under differerent noise regimes: no noise, signal proportional noise, signal inverse proportional noise. The optimal trajectories are very different in these 3 cases and humans seem to be quite good at learning these trajectories. Here is a link to the paper
  • He talked about an experiment by Julia something from Germany were the task is reaching under different pay off regimes.
  • He talked about experiments on combination of visual and proprioceptive information. Cited the work by a person at UCSF.
  • He talked about some computational work he is doing in which optimal trajectories are computed as linear combinations of a library of trajectories. This approach may simplify the optimization problem so it becomes a standard gradient descent like problem as opposed to a variational problem.
  • Here is a link to Roby’s work
  • NIPS 07 Report: Mike Lewicki Tutorial on Sensory Coding

    Author:movellan @ December 3rd, 2007 2 Comments

  • Mike talked about the problem of why we have ganglian center-surround cells if Gabor happened to be the most efficient code. He showed that by adding a very small weight connectivity coinstraint you end up with Ganglian cells instead of Gabors. This begs the question of why we have Gabors in V1.
  • Mike presented a model that attempts to lean a universal dictionary of texture. It is akin to a hierarchical ICA model. Here is a link to the paper:
    karklin-lewicki-nc05-preprint.pdf It may be interesting to generalize this idea to auditory “textures”.
  • Mike presented his cool work on coding auditory signal’s and Gammatones as optimal encoders. He also seems to have extended the work to learn to detect auditory scenes. You can see his work by following this
    link to Mike’s Research

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