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Semantic representation and storage

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All information about a category is stored in one place, ... Natural objects - more visual respresentation. Man-made objects - more functional representation ... – PowerPoint PPT presentation

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Title: Semantic representation and storage


1
Semantic representation and storage
  • How do we store what we know about the world?

2
What is semantic memory?
  • People know a lot of stuff.
  • Think of everything you know about cars. Its
    more than you think.
  • How is this stuff organized?

3
Semantic Networks
4
Decision Networks
5
What does semantic memory do?
6
Unitary Content Hypothesis
  • Information storage is based on categories.
  • All information about a category is stored in one
    place, and is accessible by every sensory
    modality.

7
Evidence for the UCH
  • Fits with our intuitions about the hierarchy of
    semantic categories.
  • Lots of cognitive effects (priming, recognition,
    memory) are influence by category-based semantic
    relationships
  • Certain brain-damaged patients show
    category-specific deficits, where they are unable
    to identify objects from particular categories.

8
Multiple Semantics Hypothesis
  • Semantic information is stored by sensory
    modality rather than category.
  • All information about a given category is
    strongly linked, but direct access to a given
    piece of information is only possible through
    that modality.

9
Evidence for the MSH
  • The rest of the cognitive system organizes its
    processing based on sensory modality. Why
    wouldnt the semantic system?
  • Attention research shows that there is
    significant priming based on sensory modality.
  • There exist brain-damaged patients with
    modality-specific deficits of semantic processing.

10
The Sensory-Functional Hypothesis
  • Category-specific deficits are not very
    fine-grained. You wont have a deficit for just
    dogs, but for all living things.
  • Maybe this is due not to category effects, but to
    how information is being represented.
  • Natural objects - more visual respresentation
  • Man-made objects - more functional representation
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