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Cognitive and psychomotor function in hypoglycemia: response error patterns and retest reliability.

Hartmut Schächinger1, Daniel Cox, Lilly Linder

  • 1Division of Psychosomatic Medicine, BIM, University Hospital, Petersgraben 4, 4031 Basel, Switzerland. Hartmut.Schaechinger@unibas.ch

Pharmacology, Biochemistry, and Behavior
|September 6, 2003
PubMed
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Hypoglycemia impairs cognitive and psychomotor function. This study found that cognitive tests, including the Paced Auditory Serial Addition Task (PASAT), are reliable and sensitive indicators of these effects.

Area of Science:

  • Neuroscience
  • Endocrinology
  • Cognitive Psychology

Background:

  • Hypoglycemia is known to affect cognitive and psychomotor functions.
  • However, the reliability and sensitivity of specific tests for detecting these impairments remain unclear.

Purpose of the Study:

  • To evaluate the reliability and sensitivity of cognitive and psychomotor tests during induced hypoglycemia.
  • To identify which measures are most effective in detecting functional deficits.

Main Methods:

  • A single-blind, repeated measures design was employed with 17 healthy young adults.
  • Participants underwent two sessions, performing Paced Auditory Serial Addition Task (PASAT), Five-Choice Reaction Time Test (CRTT), and manual tracking.
  • A hyperinsulinemic clamp method induced normoglycemic and hypoglycemic (2.7 mmol/l) states.

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Main Results:

  • All tested cognitive and psychomotor measures demonstrated high test-retest reliability (r = .69–.95).
  • These measures were also highly sensitive to hypoglycemia (P<.01).
  • Notably, hypoglycemia increased omission errors more than false responses on the PASAT.

Conclusions:

  • Cognitive and psychomotor tests, including the PASAT, are reliable and sensitive to hypoglycemia in healthy young adults.
  • The Paced Auditory Serial Addition Task (PASAT) may be particularly useful for detecting specific types of errors (omissions) induced by hypoglycemia.