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Hearing ability decreases in ageing locusts.

Shira D Gordon1, James F C Windmill1

  • 1Centre for Ultrasonic Engineering, Department of Electronic and Electrical Engineering, University of Strathclyde, 204 George Street, Glasgow G1 1XW, UK Shira.Gordon@ars.usda.gov james.windmill@strath.ac.uk.

The Journal of Experimental Biology
|May 7, 2015
PubMed
Summary
This summary is machine-generated.

As locusts age, their hearing sensitivity declines, particularly for low frequencies. This age-related hearing loss is more pronounced in females, potentially due to reproductive factors.

Keywords:
AgeInsectLaser vibrometryNeurophysiologySchistocerca gregariaSound

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Area of Science:

  • Auditory neuroscience
  • Insect physiology
  • Gerontology

Background:

  • Insects exhibit aging, but research on senescence typically focuses on longevity and reproduction, not sensory decline.
  • Hearing ability in aging insects remains understudied, despite its importance for survival and communication.

Purpose of the Study:

  • To investigate the impact of aging on the auditory neurophysiological responses in adult locusts (Schistocerca gregaria).
  • To determine if hearing sensitivity changes with age and if there are sex-specific differences in auditory perception.

Main Methods:

  • Measured neurophysiological responses to sound stimuli in locusts of different ages (2 and 4 weeks post-maturity).
  • Analyzed sound frequency and latency of neural responses.
  • Assessed tympanal membrane displacement to correlate with neural activity.

Main Results:

  • Younger adult locusts (2 weeks post-maturity) showed significantly greater neurophysiological responses to sound, especially at low frequencies (<10 kHz), with shorter neural response latencies.
  • Tympanal membrane displacement did not directly correlate with the neural response, suggesting tissue condition (e.g., elasticity) influences auditory sensitivity.
  • Sex-specific differences were observed, with females at 4 weeks post-adult moult exhibiting reduced sound reception, potentially linked to reproductive status.

Conclusions:

  • Hearing sensitivity in locusts decreases with age, characterized by reduced overall response and increased latency, particularly for low-frequency sounds.
  • Tissue elasticity and potentially female reproductive condition contribute to age-related changes in auditory perception.
  • Older locusts, especially females, demonstrate diminished sensitivity to auditory stimuli.