Please enable JavaScript.
Coggle requires JavaScript to display documents.
Hippocampus (CA3 (autoassosiator, recall complex memory with a cue which…
Hippocampus
CA3
autoassosiator, recall complex memory with a cue which is a subcomponent of associative memory; gets associated with each other: flowers, sun, blue ski
-
new event to be memorized would be represented as firing in a pattern of CA3-->pattern would be stored using associatively modifiable synapses on the recurrent connection: synapses back to dendrite off other CA3 cells; retrieval of a whole representation could be initiated by activation of some parts of it (cue)
-
-
-
Hebbian Learning does not specify how much the connections between should increase not how to compute the activity of two neurons
-
-
Neo Hebbian Learning
Weight change equation
-
-
Weight Change depends on: decay of the weight values if they are not actively refreshed by new learning.
hebbian conditions significant learning occurs only when both the activity of the receiving neurode and the currently received signal are strong at the same time.
-
differential hebbian Learning Change of weight between neurode i and neurode j = learning constant firing rate change of neurode i firing rate change of neurode j.
revisions of hebbian learning proclaimed that weight change does not depend on whether two neurons fire together, but whether their firing rate increases/decreases together.
“What has been changing firing rate together, wires together.”
information processing within hippocampus in 3 sequenential stages: dendate gyrus and cornu ammonis (C3->C1)
-
-
dantate also called competetive learning stage because it receives input from neocortex and have inhibitory connections between cells in that gyrus
ability to reduce noise, things you do not need and inhibit them so that you only select those things currently important for information processing
-
-
-
Instar: from the point of view of the neurode; receives many stimulus signals, coming from somewhere “outside” its boundaries
-