Unformatted text preview: Muller et al. 1990) Head-Direction Cell ((J. Taube) Example of continuous attractors: Ring attractor Head-direction cells - signal heading direction in world coordinate system.
- anchored to familiar landmarks (rapid learning).
- relies on self-motion (works in total darkness).
- correlated tightly with hippocampal place cells. Space related cells
- Head-direction cell: heading direction
- Grid cell: periodic spatial location
- Place cell: spatial location
All three representations are in world coordinate system, and
they depend on both familiar landmarks and path integration by
self-motion. Place cells in hippocampus Place Field Follows Learned Visual Landmark Basic properties of place cells:
• Place cell firing is determined primarily by spatial location
• Cues for spatial location come from multiple sensory modalities and self-motion
• Rapid learning of landmarks within a few minutes Head-direction cells and place cells are tightly coupled Example of continuous attractors: Surface attractor Torus attractor network physical
& connections Single neuron
firing field (McNaughton et al. 2006) Grid cells in entorhinal cortex Cell 1 Cell 2 Cell 3
Another 3 cells: trajectories
and spikes (superimposed)
& firing average
firing rate Anatomical Hierarchy of Macque Monkey Brain
Hippocampus (Van Essen) Response of a single neuron in human hippocampal region
“Jennifer Aniston” “Sydney Opera”...
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- Spring '14
- entorhinal cortex, recurrent network, different initial states