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Lexical-semantic and executive deficits revealed by computational modelling: A drift diffusion model perspective.

Lara Todorova1, David A Neville1, Vitória Piai2

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Summary

Flexible language use relies on conceptual and control systems. Word-picture matching interference stems from executive control, not semantic processing, impacting both frontal and temporal brain regions.

Keywords:
Drift diffusionExecutive controlSemantic interference

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Area of Science:

  • Cognitive Neuroscience
  • Psycholinguistics
  • Neurobiology

Background:

  • Flexible language use depends on integrating conceptual knowledge with executive control.
  • Word-picture matching (WPM) tasks reveal interference effects, but the underlying neural mechanisms remain unclear.
  • The drift diffusion model (DDM) provides a framework for analyzing decision-making processes.

Purpose of the Study:

  • To investigate the cognitive mechanisms underlying word-picture matching interference using the drift diffusion model (DDM).
  • To examine the impact of left-frontal and left-temporal lesions on WPM performance and its underlying computational parameters.
  • To differentiate between semantic and executive control contributions to WPM interference.

Main Methods:

  • Analysis of word-picture matching (WPM) performance in patients with left-temporal (N=5) or left-frontal (N=5) lesions and matched controls (N=12).
  • Application of the drift diffusion model (DDM) to estimate decision threshold, drift rate, starting point, and non-decision time.
  • Comparison of DDM parameters between control participants and patient groups for related and unrelated word-picture pairs.

Main Results:

  • In controls, WPM interference was characterized by a higher decision threshold for related word-picture pairs, suggesting an executive control mechanism.
  • No significant differences in drift rate were observed in controls, indicating that the quality of evidence accumulation was not affected.
  • Patients with both temporal and frontal lesions showed increased drift rate and decision threshold for unrelated pairs, suggesting broader impacts on cognitive computations.

Conclusions:

  • Word-picture matching interference primarily involves executive control mechanisms rather than solely semantic processing.
  • Damage to both left-frontal and left-temporal cortices similarly affects cognitive computations in WPM.
  • Lexical-semantic memory and semantic control mechanisms play interactive and diverse roles in flexible language processing.