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Area of Science:

  • Cognitive Neuroscience
  • Psycholinguistics
  • Neuroscience of Language

Background:

  • Word reading and picture naming involve distinct cognitive processes, such as visual and lexico-semantic stages.
  • A common hypothesis suggests that the retrieval of phonological forms is a shared process across these tasks.
  • Investigating the temporal dynamics of neural activity can reveal shared versus task-specific cognitive mechanisms.

Purpose of the Study:

  • To test the hypothesis that phonological form retrieval is a shared cognitive process in word reading and picture naming.
  • To examine the time course of electroencephalographic (EEG) neural activity during object naming and word reading.
  • To identify shared and distinct neural signatures across tasks and their temporal evolution.

Main Methods:

  • Seventeen participants performed object naming and word reading tasks while their behavior and EEG activity were recorded.
  • EEG data were analyzed using stimulus-locked and response-locked analyses, employing non-parametric statistics and spatio-temporal segmentation of ERPs.
  • Behavioral latencies and EEG signal topographies and amplitudes were compared across tasks.

Main Results:

  • Behavioral data showed shorter response latencies for word reading compared to picture naming.
  • EEG analysis revealed three temporal phases: early shared topographies with amplitude differences, followed by distinct topographies, and finally shared topographies with temporal delays.
  • Response-locked analysis indicated faster transitions from shared neural activity to articulation in word reading than in picture naming.

Conclusions:

  • The degree of cross-task neural similarity varies dynamically over time, with distinct early visual processing and later shared phonological processing.
  • Shared phonological processing is supported, but with different temporal properties (onset/offset) between word reading and picture naming.
  • The findings delineate the temporal unfolding of shared versus task-specific neural signatures in language production tasks.