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Related Experiment Video

Updated: Jun 20, 2026

Interaction between Phonological and Semantic Processes in Visual Word Recognition using Electrophysiology

Interaction between Phonological and Semantic Processes in Visual Word Recognition using Electrophysiology

Published on: June 29, 2021

The neural response to changing semantic and perceptual complexity during language processing.

David J Sharp¹, Malaka Awad, Jane E Warren

¹Imperial College London, Hammersmith Hospital Campus, United Kingdom. david.sharp@imperial.ac.uk

Human Brain Mapping

|September 25, 2009

Summary

This study shows how the brain processes speech by changing activity in different areas based on how difficult the sounds or meanings are. Understanding speech difficulty involves distinct neural networks in the brain.

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Dissociation of the Confounding Influences of Expectancy and Integrative Difficulty Residing in Anomalous Sentences in Event-related Potential Studies

Published on: May 9, 2019

Area of Science:

Neuroscience
Cognitive Science
Psycholinguistics

Background:

Speech comprehension relies on processing acoustic, phonetic, and lexical information.
Neural mechanisms underlying the modulation of speech processing difficulty remain incompletely understood.

Purpose of the Study:

To investigate neural responses to manipulated perceptual and semantic processing difficulty in speech comprehension.
To identify distinct brain regions involved in processing varying levels of speech complexity.

Main Methods:

Positron emission tomography (PET) scanning was used in 12 subjects.
Participants made semantic relatedness judgments on heard nouns.
Perceptual difficulty was manipulated via speech clarity (clear vs. degraded), and semantic difficulty via word relatedness.

Main Results:

Increased perceptual difficulty correlated with greater activation in the left superior temporal gyrus.
Increased semantic difficulty led to reduced superior temporal gyrus activity and increased left angular gyrus activation.
Overall language processing complexity engaged the left inferior prefrontal cortex.

Conclusions:

Speech comprehension involves a flexible neural network.
Distinct brain regions modulate activity based on changing perceptual and semantic processing demands.
The findings highlight the brain's adaptive capacity in language processing.