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Neonatal nicotine exposure impairs development of auditory temporal processing.

Wei Sun1, Anna Hansen, Liyan Zhang

  • 1Center for Hearing and Deafness, State University of New York at Buffalo, Buffalo, NY 14214, USA. weisun@buffalo.edu

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Neonatal nicotine exposure impairs auditory temporal processing in rats, affecting gap detection. This suggests developmental changes in the brain

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Auditory Processing

Background:

  • Accurate temporal processing of sound is crucial for speech perception and language development.
  • Maternal smoking during pregnancy can negatively impact infant speech processing and language acquisition.
  • The specific effects of neonatal nicotine exposure on auditory temporal processing development remain unclear.

Purpose of the Study:

  • To investigate how neonatal nicotine exposure affects the development of auditory temporal resolution.
  • To examine the impact of nicotine on gap detection abilities in developing rats using gap-induced prepulse inhibition (gap-PPI).

Main Methods:

  • Neonatal rats were exposed to saline (control), 1mg/kg nicotine, or 5mg/kg nicotine from postnatal days 8-12.
  • Gap-induced prepulse inhibition (gap-PPI) of the acoustic startle response was used to assess auditory temporal resolution.
  • Gap-detection abilities were evaluated at different developmental stages (P45 and P60) and after acute nicotine administration in adults.

Main Results:

  • Neonatal nicotine exposure resulted in poorer gap-PPI during early development compared to controls.
  • While control rats showed significant improvement in gap-PPI by P45 and P60, nicotine-exposed rats showed less improvement.
  • At P60, the 5mg/kg nicotine group exhibited a significantly higher gap-detection threshold, indicating impaired acuity.
  • Adult rats with prior nicotine exposure showed a temporary improvement in gap-PPI after an acute nicotine injection.

Conclusions:

  • Neonatal nicotine exposure impairs the normal developmental trajectory of auditory temporal processing, specifically gap detection.
  • These impairments are likely mediated by alterations in cholinergic systems due to early nicotine exposure.
  • Findings highlight potential long-term consequences of prenatal/neonatal smoke exposure on auditory development and speech processing.