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Chapter 9

Psychology 2010A/B Chapter Notes - Chapter 9: Semantic Network, Spreading Activation, Psych


Department
Psychology
Course Code
PSYCH 2010A/B
Professor
Terry Biggs
Chapter
9

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Psych 2010A
Chapter 9 - Semantic Organization
to retrieve related information from LTM, we must be able to organize our memory
much of this organization is semantic - relies heavily on the meaning of the
information
an effective way to organize information is to form hierarchies.
two major classes of models are used:
one model assumes that people compare the features of two categories to
determine their relationship
one model assumes that the relation between two categories is stored directly in
memory in a semantic network - consists of concepts joined to other concepts by
links that specify the relation between them.
spreading activation: the activation of a concept can lead to the activation of related
concepts as the activation spreads along the paths of the network.
Organization and Recall
hierarchical organization can also influence performance by facilitating the recall of
semantic information
recall of hierarchical information
one advantage of a well-organized memory is that it helps us retrieve information
in a systematic way.
effects of organization are not limited to hierarchical organization
Bower and colleagues presented people with associated words linked together
- people recalled many more words than when the same words were randomly
linked together
semantic organization of the material improved recall, even though the
organization did not consist of a hierarchy.
hierarchical organization can also help people recall numerical information from
STM as demonstrated by testing a single subject over a 1-year period
subjects ability to recall groups of digits didnʼt generalize to letters.
Building Semantic Networks
one way to organize information is to construct a semantic network - show how
concepts are related to each other
nodes: the format for presenting concepts in a semantic network
links: the format to representing relations in a semantic network
students who constructed semantic networks of a material did better than the
control group on short-answer and essay questions but did not do significantly
better on the multiple-choice questions.
constructing semantic networks is a good method for organizing knowledge, as
indicated by the resulting higher test scores on the open questions
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Verification of Semantic Statements
how effective organization, particularly hierarchical organization, increased the amount
of information that we can retrieve from the LTM
hierarchical organization can also influence the time required to retrieve information
feature-comparison model: a model proposing that items are categorized by
matching the itemʼs features to category features
hierarchical network model: a model proposing that items are categorized by using
the hierarchical relations specified in a semantic network.
The Hierarchical Network Model
one advantage of this kind of network is that it provides an economical way to store
information because the information does not have to be repeated at each of the
three levels.
it is necessary to go to the appropriate level in the hierarchy before retrieving the
features stored at that level.
made two primary assumptions:
it takes time to move from one level in the hierarchy to another and
that additional time is required if it is necessary to retrieve the features stored at
one of the levels
the finding is consistent with the assumption that response time should increase if
it is necessary to retrieve the features stored at one of the levels in the hierarchy.
Facilitation occurs when the retrieval of information is made easier because the
previous question required retrieval of similar information.
does not account for the typicality effect - the fact that more typical members of
categories are easier to classify than less typical ones.
model does not predict differences in response time
The Feature Comparison Model
model assumes that the meaning of words can be represented in memory by a list
of features and that classifications are made by comparing features rather than by
examining links in a network.
defining features: features that an entity must have to be a member of a category,
whereas,
characteristic features: are usually possessed by category members but are not
necessary.
has two stages:
first stage compares all the features of two concepts to determine how similar
one concept is to the other
second stage is necessary when the degree of similarity is between the two
extremes.
model predicts that the more typical members of a category should be classified
more rapidly than the less typical members because evaluating the defining
features during the second stage slows the classification
unlike the network model, this model provides an explanation of why some false
statements are evaluated more quickly than others (i.e. “A bat is a bird”)
another advantage of this model is that it can account for the reversal of the
category-size effect
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