Visual-somatosensory integration in older adults: Links to sensory functioning

Kristina Dumas, Roee Holtzer, Jeannette R. Mahoney

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Research investigating multisensory integration (MSI) processes in aging is scarce, but converging evidence for larger behavioral MSI effects in older compared to younger adults exists. The current study employed a three-prong approach to determine whether inherent age-related sensory processing declines were associated with larger (i.e., worse) visual-somatosensory (VS) reaction time (RT) facilitation effects. Non-demented older adults (n=156; mean age = 77 years; 55% female) without any medical or psychiatric conditions were included. Participants were instructed to make speeded foot-pedal responses as soon as they detected visual, somatosensory, or VS stimulation. Visual acuity was assessed using the Snellen test while somatosensory sensitivity was determined using vibration thresholds. The aims of the current study were to: (1) replicate a reliable MSI effect; (2) investigate the effect of unisensory functioning on VS RT facilitation; and (3) determine whether sensory functioning combination groups manifested differential MSI effects. Results revealed a significant VS RT facilitation effect that was influenced by somatosensory sensitivity but not visual acuity. That is, older adults with poor somatosensory sensitivity demonstrated significantly larger MSI effects than those with intact somatosensory sensitivity. Additionally, a significant interaction between stimulus condition and sensory functioning group suggested that the group with poor visual acuity and poor somatosensory functioning demonstrated the largest MSI effect compared to the other groups. In summary, the current study reveals that worse somatosensory functioning is associated with larger MSI effects in older adults. To our knowledge, this is first study to identify potential mechanisms behind increased RT facilitation in aging.

Original languageEnglish (US)
Pages (from-to)397-420
Number of pages24
JournalMultisensory research
Volume29
Issue number4-5
DOIs
StatePublished - 2016

Keywords

  • Aging
  • Multisensory integration
  • Somatosensory sensitivity
  • Visual acuity

ASJC Scopus subject areas

  • Computer Vision and Pattern Recognition
  • Ophthalmology
  • Cognitive Neuroscience
  • Sensory Systems
  • Experimental and Cognitive Psychology

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