Neural Circuits Lecture 12

Lecture 11 13th March 2017


Neural Circuits

Hippocampus and Place Learning (declarative learning)

What are the 4 types of Implicit Memory?
 Priming
 Procedural
 Associative Learning
 Non-associative learning

What are the two types of explicit memory?
 Semantic
 Episodic

Hippocampus lecture outline:
– Site of learning?
– Organization of the hippocampus
Place Learning
– The involvement of the hippocampus
– Rapid learning and pattern completion

Episodic and semantic memory
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 Ribot (French 19 century psychologist) noted that memory loss after
brain injury often varied with the age of the memory:
 Recent episodic and semantic memories more susceptible to loss
than remote ones.
 Led to the suggestion that memories are re-organized over time,
relying first on a brain region specialized for rapid storage, and
then on a region in which consolidation takes longer.
 It is now supposed that the
 Hippocampus is a region for the rapid acquisition
 Neo-cortex for slower consolidation of memories.
 The modern story starts with a patient known as HM.

Who was HM and what did we learn from him?
 Temporal lobe removed
 Removed the hippocampus
 Old memories intact
 No retention of new memories (anterograde amnesia)
 Every time HM met his psychologist he introduced himself as if he never
met her