cogst 214 prelim 1review - Cogst 2140 Prelim 2 Review...

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Cogst 2140 Prelim 2 Review Chapter 6: Memory Lecture 8.1 memory is for interaction w/world value: interaction w/entire stimuli navigation: interaction w/structured environts concepts: interaction w/structured situations self: autobiographical memories TOM:memories of interaction w/other agents multiple realiziblility: same comp. functionality (“functional equivalence”) can be implemented in diff forms. any device that can enter and remain in one of several possible states = “memory cell” 2 neurons --> 2D state space that describes activity of 2 neurons; height of surface = PE. energy surface is smooth and each eqm state has wide basin of attraction-every input falling w/in it makes the network end up in the same state (generalization). memory recall = stimulus falling into an attractior space. autoassociative recall: memory system stores and item and needs to retrieve it later for processing. heteroassociative recall: memory system assoc. one item w/another and needs to retrieve 2 nd one given the first as a cue. both = content based. simple memory happens in hippocampus. attractor network: projections of two cells connect to the inputs of the same cells, forming feedback circuit. Lec. 8.2 evidence for cognitive maps: rats take the shortest return route in a maze with many variable-length paths dead-reckoning: measuring off and integrating route info (blindfolded subjects can still navigate back to point of origin) landmarks: compare current perceptual state to memory; choose direct. of movt that increases chances of reaching destination. receptive field of place cells:??? ex: rat’s path can be determined from firing of place cells in familiar enclosure. certain hippocampal cells fire selectively in specific locns. place cells fire slightly before rat reaches the locn-->neural activity predicts location no full reconstruction of environt. instead hippocampus encodes episodic memory (stores multivariable-locn, speed, motor movt-info about specific events). associate events with locations they occur at. Instead, the codings of spatial and nonspatial features are organized in ''clusters'' of neurons that overrepresent some features of the environment at the expense of others. Hippocampal spatial firing patterns do not reflect the global topology of all the
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This note was uploaded on 01/10/2009 for the course COGST 2140 taught by Professor Edelman, s during the Fall '08 term at Cornell University (Engineering School).

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cogst 214 prelim 1review - Cogst 2140 Prelim 2 Review...

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