Marcus Lewis proposes an explanation for grid cell distortions from an experiment he conducted. Jeff Hawkins then explores the possible processes and mechanism that underlie reference frame transformations.
Marcus Lewis reviews the paper “The Tolman-Eichenbaum Machine: Unifying Space and Relational Memory through Generalization in the Hippocampal Formation” by James Whittington, et al. The team discusses the multiple grid cell modules and mechanisms presented in the paper.
Jeff Hawkins reviews the paper “Grid Cell Firing Fields in A Volumetric Space” by Roddy Grieves, et al. Marcus then discusses a talk by Benjamin Dunn showing simultaneous recordings from over 100 neurons in a grid cell module.
Jeff Hawkins explains how introspection can be a helpful tool in neuroscience research. Jeff then proposes four possible explanations for how the neocortex can represent objects with different orientations.
Jeff Hawkins brainstorms some ideas on minicolumns and suggests a new mechanism for calculating reference frame transformation that ties into his minicolumn hypothesis.