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Related Experiment Videos

Response time as an index for selective auditory cognitive deficits.

Reza Nilipour1, Stephanie Clarke, Behrad Noudoost

  • 1Department of Speech Therapy, University of Welfare and Rehabilitation Sciences, Kudakyar Ave., Evin, 19834 Tehran, Iran. nilipour@uswr.ac.ir.

Acta Neurobiologiae Experimentalis
|September 16, 2004
PubMed
Summary

Brain lesion recovery may involve alternative neural networks, indicated by slower response times. This study found increased response times in patients, suggesting alternative processing in cognitive functions after brain injury.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Cognitive function recovery after brain lesions is often attributed to the recruitment of alternative neural networks.
  • Anatomical evidence supports this for auditory cognitive functions.
  • Behavioral correlates of alternative network use, specifically increased response times, require further investigation.

Purpose of the Study:

  • To investigate behavioral correlates, particularly increased response times, associated with the use of alternative processing networks following brain lesions.
  • To compare the performance and response times of patients with unilateral hemispheric infarction to normal control subjects across various auditory tasks.

Main Methods:

  • Evaluated 5 patients with unilateral hemispheric infarction (right or left) and 6 healthy controls.

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  • Assessed performance in sound identification, asemantic sound recognition, sound localization, and sound motion perception.
  • Measured correct replies and response times for both correct and incorrect responses.

    • Main Results:

    • Patients with left lesions showed deficits in sound identification and motion perception; one patient with a right lesion had deficits in sound localization and motion perception.
    • Deficient performance in these patients was linked to increased response times.
    • Two patients with normal performance exhibited significantly longer response times in certain tasks.
    • Patients, regardless of performance level, were more likely to respond faster correctly than incorrectly compared to controls.

    Conclusions:

    • Increased response time is proposed as an indicator of processing within an alternative neural network after brain injury.
    • This suggests that even with intact performance, cognitive processes may be less efficient when relying on alternative networks.
    • The findings provide behavioral evidence supporting the neural network recruitment theory for cognitive recovery.