Apr 18, 2020

Dissociable electrophysiological measures of natural language processing reveal differences in comprehension strategy in healthy ageing

BioRxiv : the Preprint Server for Biology
Michael P BroderickE. C. Lalor

Abstract

Healthy ageing leads to changes in the brain that impact upon sensory and cognitive processing. It is not fully clear how these changes affect the processing of everyday spoken language. Prediction is thought to play an important role in language comprehension, where information about upcoming words is pre-activated across multiple representational levels. However, evidence from electrophysiology suggests differences in how older and younger adults use context-based predictions, particularly at the level of semantic representation. We investigate these differences during natural speech comprehension by presenting older and younger subjects with continuous, narrative speech while recording their electroencephalogram. We use linear regression to test how distinct computational measures of 1) semantic dissimilarity and 2) lexical surprisal are processed in the brains of both groups. Our results reveal dissociable neural correlates of these two measures that suggest differences in how younger and older adults successfully comprehend speech. Specifically, our results suggest that, while younger and older subjects both employ context-based lexical predictions, older subjects are significantly less likely to pre-activate the semantic ...Continue Reading

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Computer Software
Study
Short Tandem Repeat
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Transcription, Genetic
Metagenome
Research Personnel
Nucleic Acid Sequencing
Radioallergosorbent Test
Bio-Informatics

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