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Olfactory event-related potentials and aging: normative data.

C Murphy1, C D Morgan, M W Geisler

  • 1San Diego State University, 6363 Alvarado Ct., Suite 101, San Diego, CA 92120-4913, USA. cmurphy@sunstroke.sdsu.edu

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
|April 1, 2000
PubMed
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Normative data for olfactory event-related potentials (OERPs) were established across the human lifespan. Processing speed and amplitude decline with age, offering valuable insights for olfactory research and clinical assessments.

Area of Science:

  • Neuroscience
  • Sensory Physiology
  • Gerontology

Background:

  • Clinical applications of evoked potentials are widespread, yet normative data for olfactory event-related potentials (OERPs) remain absent.
  • Establishing OERPs normative data is crucial for understanding olfactory function across the human lifespan and in various clinical contexts.

Purpose of the Study:

  • To establish normative data for olfactory event-related potentials (OERPs) across seven age groups, spanning from adolescence to older adulthood.
  • To analyze the effects of aging on OERP components, including amplitude and latency, to identify age-related changes in olfactory processing.

Main Methods:

  • 140 participants aged 16-79 years, screened for nasal health and dementia, were divided into seven age groups.
  • Olfactory event-related potentials (OERPs) were elicited using amyl acetate and recorded at Fz, Cz, and Pz electrode sites.

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  • Analysis focused on amplitudes (N1/P2, P3) and latencies (P2, P3), examining age-related trends in processing speed and signal amplitude.

    • Main Results:

    • Processing speed, reflected by P2 and P3 latencies, decreased consistently across decades, indicating age-related slowing in both sensory and cognitive olfactory processing.
    • A noticeable decline in OERP amplitude was observed over successive decades, suggesting age-associated changes in the neural response to olfactory stimuli.
    • Normative data revealed significant age-related alterations in both the timing and magnitude of neural responses to odors.

    Conclusions:

    • The established normative data for OERPs provide a critical benchmark for research into olfactory function and dysfunction.
    • Findings highlight age-dependent declines in olfactory processing speed and amplitude, essential for clinical interpretation of OERP measures.
    • These normative data will facilitate the clinical assessment of olfactory functional status and aid in the diagnosis of olfactory disorders.