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Lexical processing in sign language: A visual mismatch negativity study.

Qinli Deng1, Feng Gu2, Shelley Xiuli Tong1

  • 1Human Communication, Development, and Information Sciences, Faculty of Education, The University of Hong Kong, Hong Kong, China.

Neuropsychologia
|September 25, 2020
PubMed
Summary
This summary is machine-generated.

Deaf signers show automatic processing of visual signs, similar to spoken words. This early brain response indicates implicit understanding in Hong Kong Sign Language (HKSL) processing.

Keywords:
Deaf signersHong Kong Sign Language (HKSL)Lexical processingVisual mismatch negativity (vMMN)

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Area of Science:

  • Cognitive Neuroscience
  • Linguistics
  • Neuroscience

Background:

  • Event-related potential (ERP) studies demonstrate automatic lexical access for spoken and written words.
  • Mismatch negativity (MMN) and visual MMN (vMMN) are key indicators of this automatic processing.
  • The neural basis of automatic processing in visual-gestural languages remains less understood.

Purpose of the Study:

  • To investigate automatic lexical processing in Hong Kong Sign Language (HKSL), a visual-gestural language.
  • To determine if deaf signers exhibit similar neural responses to visual signs as hearing individuals do to spoken/written words.
  • To compare brain activity between deaf signers and hearing non-signers during sign perception.

Main Methods:

  • Utilized a classic visual oddball paradigm with static images of HKSL signs and non-signs.
  • Recorded event-related potentials (ERPs) from deaf signers and hearing non-signers.
  • Analyzed visual mismatch negativity (vMMN) and the P1-N170 complex.

Main Results:

  • Deaf signers showed an enhanced vMMN to lexical signs around 230 ms, unlike hearing non-signers.
  • A larger P1-N170 complex was observed in deaf signers for both lexical signs and non-signs (65-170 ms).
  • Neural response differences emerged at an early stage of visual sign processing.

Conclusions:

  • Deaf signers implicitly process HKSL lexical signs automatically.
  • Early-stage neural differences in sign processing exist between deaf signers and hearing non-signers.
  • Findings suggest automaticity in visual-gestural language processing comparable to auditory and visual spoken/written language.