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Abnormal spatial frequency processing in high-functioning children with pervasive developmental disorder (PDD).

M A Boeschoten1, J L Kenemans, H van Engeland

  • 1Rudolf Magnus Institute of Neuroscience, Department of Child and Adolescent Psychiatry, University Medical Center Utrecht, PO Box 85500, 3508 GA Utrecht, The Netherlands. mboeschoten@ant-neuro.com

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|June 27, 2007
PubMed
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Children with Pervasive Developmental Disorder (PDD) show early visual processing abnormalities, particularly with high spatial frequencies. This suggests fundamental visual processing deficits contribute to PDD characteristics.

Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Visual Science

Background:

  • Pervasive Developmental Disorder (PDD) is associated with visual processing differences.
  • Understanding early visual processing in PDD is crucial for identifying core deficits.

Purpose of the Study:

  • To investigate spatial frequency processing deficits in children with PDD.
  • To examine early sensory-level visual processing in high-functioning children with PDD.

Main Methods:

  • Visual evoked potentials (VEPs) were recorded in children with PDD and controls.
  • VEPs and their dipole sources were analyzed using high and low spatial frequency gratings.

Main Results:

  • Children with PDD exhibited atypical processing of high spatial frequencies around 80 ms (N80-latency).

Related Experiment Videos

  • At 130 ms (P1-latency), weaker source activation for both frequencies and additional superior-lateral source recruitment were observed in the PDD group.

    • Conclusions:

    • A fundamental abnormality in visual frequency processing exists in children with PDD.
    • Early high spatial frequency processing deficits and later atypical processing of both frequencies characterize PDD.
    • These visual processing abnormalities may underlie difficulties with social stimuli processing in PDD.