PSY270H1 Lecture Notes - Lecture 5: Synapse, Long-Term Potentiation, Memory Consolidation

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Published on 22 Sep 2017
School
UTSG
Department
Psychology
Course
PSY270H1
Lecture5: Long-Term Memory: episodic Memory
Learning Objective
Explain the serial position curve and what causes it
- Primacy Effect: better memory in the beginning; occurs because items are successfully transferred
to the LTM
- Recency effect: last 2-3 items you just heard; they are still active in the STM
Define 2 types of interference
- Retroactive Interference: inhibitory effects of new information on old information
- Proactive Interference: inhibitory effects of old information on new information
Describe release from PI and provide experimental evidence
- Wike’s 19 deostrates that it is possile to keep learig with iterferee: he had people
remember three fruits and had them to engage in a task that interfere rehearsal (count backwards
by three)
- He then gave them three more fruits with delay. He gave another three fruits.
- The memory drastically dropped after the second trial and dropped for the last three too. Old info
is getting in the way of new information
- Fourth trial: participants were presented with three more fruits, the second group got three
vegetables the third group got three types of meat and the fourth group got three profession
o Fruit performance was just as poor
o Vegetable performance a little better
o Meat group significantly improved
o Profession group improved the most
- If things can be grouped into different categories with different meaning, thy wont be affected by
interference
Describe 3 types of consolidation
- Synaptic Consolidation: occurs at the neuronal level and is fast acting
o Long term potentiation increases the sensitivity of post-synaptic neurons by causing
structural changes
- System consolidation: involves multiple brain structures and can take decades
o Medial temporal lobe is particularly important for systems consolidation
o Standard model of consolidation is hippocampal-dependent, but retrieval is hippocampal-
independent
- Reconsolidation: occurs when a memory is reactivated but over a much shorter time course
Define the types of rehearsal
- Maintenance: keeps information active in STM; repeating the memory over and over again
- Elaborative: links info from STM with that already in LTM; creating meaningful connection between
the information and STM and LTM
Explain Levels of Processing theory, its problems and well-supported concepts from the theory
- Levels of processing theory describes the observation that how we encode information affects the
likelihood of retrieval
- Problems:
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Document Summary

Learning objective: explain the serial position curve and what causes it. Primacy effect: better memory in the beginning; occurs because items are successfully transferred to the ltm. Recency effect: last 2-3 items you just heard; they are still active in the stm: define 2 types of interference. Retroactive interference: inhibitory effects of new information on old information. Proactive interference: inhibitory effects of old information on new information: describe release from pi and provide experimental evidence. Wi(cid:272)ke(cid:374)"s (cid:894)19(cid:1011)(cid:1010)(cid:895) de(cid:373)o(cid:374)strates that it is possi(cid:271)le to keep lear(cid:374)i(cid:374)g with i(cid:374)terfere(cid:374)(cid:272)e: he had people remember three fruits and had them to engage in a task that interfere rehearsal (count backwards by three) He then gave them three more fruits with delay. The memory drastically dropped after the second trial and dropped for the last three too. Old info is getting in the way of new information.

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