Different stages of emotional prosody processing in healthy ageing-evidence from behavioural responses, ERPs, tDCS, and tRNS

PLoS One. 2022 Jul 21;17(7):e0270934. doi: 10.1371/journal.pone.0270934. eCollection 2022.

Abstract

Past research suggests that the ability to recognise the emotional intent of a speaker decreases as a function of age. Yet, few studies have looked at the underlying cause for this effect in a systematic way. This paper builds on the view that emotional prosody perception is a multi-stage process and explores which step of the recognition processing line is impaired in healthy ageing using time-sensitive event-related brain potentials (ERPs). Results suggest that early processes linked to salience detection as reflected in the P200 component and initial build-up of emotional representation as linked to a subsequent negative ERP component are largely unaffected in healthy ageing. The two groups show, however, emotional prosody recognition differences: older participants recognise emotional intentions of speakers less well than younger participants do. These findings were followed up by two neuro-stimulation studies specifically targeting the inferior frontal cortex to test if recognition improves during active stimulation relative to sham. Overall, results suggests that neither tDCS nor high-frequency tRNS stimulation at 2mA for 30 minutes facilitates emotional prosody recognition rates in healthy older adults.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acoustic Stimulation / methods
  • Aged
  • Brain
  • Electroencephalography
  • Emotions / physiology
  • Evoked Potentials / physiology
  • Healthy Aging*
  • Humans
  • Speech Perception* / physiology
  • Transcranial Direct Current Stimulation*

Grants and funding

This work was funded by an Aging and Assisted Living Seedcorn Fund (University of Essex) awarded to SP and RR (DG01803). The funders did not play a role in the design, data collection, analysis, or manuscript preparation.