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The flow table test is an established method used to assess the workability of concrete, particularly useful for evaluating highly flowable concrete mixes. This test employs an apparatus that consists of a wooden board topped with a steel plate, collectively weighing 35 pounds. The board is connected to a base via a hinge and measures 27.6 inches on each side.
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A Computerized Test of Design Fluency.

David L Woods1,2,3,4,5, John M Wyma1, Timothy J Herron1

  • 1Human Cognitive Neurophysiology Laboratory, VANCHCS, 150 Muir Rd., Martinez, CA 95553, United States of America.

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Summary
This summary is machine-generated.

The computerized design-fluency (C-DF) test offers a rapid, reliable measure of visuospatial pattern generation, an executive function. This test effectively identifies performance deficits in individuals with severe traumatic brain injury (TBI).

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychometrics

Background:

  • Design fluency (DF) tests assess executive functions related to the non-dominant frontal lobe by measuring the generation of geometric patterns.
  • Traditional DF tests can be time-consuming and subjective in scoring.
  • A need exists for efficient, objective measures of design fluency.

Purpose of the Study:

  • To introduce and characterize a novel computerized design-fluency (C-DF) test.
  • To evaluate the C-DF test's reliability, validity, and sensitivity to neurological conditions.
  • To establish the C-DF test as a tool for assessing visuospatial pattern generation and executive functions.

Main Methods:

  • Development of a computerized design-fluency (C-DF) test measuring response times and automatically scoring pattern generation.
  • Administration of the C-DF test to 180 control participants (ages 18-82) to assess normative data and correlations with demographic factors (Experiment 1).
  • Evaluation of test-retest reliability in 55 participants over three weekly sessions (Experiment 2).
  • Investigation of simulated malingering effects on C-DF performance (Experiment 3).
  • Assessment of C-DF performance in veteran patients with varying severity of traumatic brain injury (TBI) (Experiment 4).

Main Results:

  • The C-DF test demonstrated reliable measurement of visuospatial pattern generation, with performance correlating with age, education, and computer use in controls.
  • High test-retest reliability (ICC = 0.79) was observed, indicating consistent performance over time.
  • The C-DF test showed sensitivity to simulated malingering, though with some overlap with control performance.
  • Patients with severe TBI exhibited significantly reduced C-DF z-scores compared to controls and those with mild TBI, indicating performance deficits.

Conclusions:

  • The computerized design-fluency (C-DF) test is a valid, reliable, and efficient tool for assessing visuospatial pattern generation and executive functions.
  • The C-DF test is sensitive to neurological impairment, particularly in individuals with severe traumatic brain injury (TBI).
  • This computerized approach offers advantages in speed, objectivity, and potential for widespread clinical and research application.