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Information Representation in AAC Systems for People with Chronic Aphasia Funded in part by: AAC-RERC, NIDRR, USDE PURPOSE Results Stimulus Sets Response Time-Picture Type Task I-Preference

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information representation in aac systems for people with chronic aphasia

Information Representation in AAC Systems for People with Chronic Aphasia

Funded in part by: AAC-RERC, NIDRR, USDE

PURPOSE

Results

Stimulus Sets

Response Time-Picture Type

Task I-Preference

  • To determine whether people with severe aphasia preferred and identified with greater accuracy and speed: (a) personally-relevant, contextualized pictures; (b) non-personally-relevant, contextualized pictures; or (c) iconic images.
  • To determine whether people with severe aphasia Identified pictured information corresponding to episodes, nouns, or verbs with greater accuracy and speed when images were (a) personally-relevant, contextualized; (b) non-personally-relevant, contextualized; or (c) iconic.
  • 16 pictures
    • Personally-relevant, contextualized
    • Non-personally-relevant, contextualized pictures
    • Iconic images
  • 3 target words assigned to 3 picture stimulus sets
  • Picture and word sets were judged for similarity in visual context
    • 3 judge panel using 3-point rating scale
    • Each picture and word pair had to receive rating of 2 or higher

PROCEDURES

  • Contextually-Rich Visual Images
    • Pictures, photographs, or images that represent situations, places, or experiences by depicting people or objects in relation to one another, the natural environment, and the central action of a scene (McKelvey, Dietz, Hux, Weissling, Beukelman, 2007).
  • Experimental Design: Repeated Measures
  • Session I
    • Western Aphasia Battery
    • Vision screening
    • Gathering of photographs
    • Picture verification
  • Session II
    • Task I - preference
    • Task II – picture identification

Response Time-Word Type

Accuracy Picture Type

METHODS

Miechelle McKelvey, Karen Hux, David Beukelman, and Aimee R. Dietz

Participants

  • 8 Adults with severe aphasia
    • 5 Women
    • 3 Men
  • Age
    • Mean = 61 years
    • Range = 25 to 86 years
  • Time Post Onset
    • Mean = 4 years 8 months
    • Range = .25 to 19.5 years
  • Aphasia Quotient
    • Mean = 25.34
    • Range = 5.86 to 58.30

Examples of Tasks Stimuli

Task I

Task II

Target:Baby shower

  • Informants
    • 4 spouses
    • 3 daughters
    • 1 mother
  • Presents (noun)
  • Opening (verb)
  • Baby shower (episode)

Accuracy for Word Type

Variables

  • Independent
    • Stimulus Picture Type
      • Personally-relevant, contextualized
      • Non-personally–relevant, contextualized pictures
      • Iconic images
    • Stimulus Word Type
      • Noun, Verb, Episode
  • Dependent
    • Preferred Picture Type
    • Accuracy
    • Speed of Accurate Response

Summary of Results

  • Participants had a clear preference for personally-relevant, contextualized pictures.
  • Participants identified personally-relevant, contextualized pictures with greatest level of accuracy.
  • Participants showed a trend for identifying personally-relevant, contextualized pictures and non-personally-relevant, contextualized pictures faster than iconic images.

http://aac.unl.edu/