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Incrementality in naming and reading complex numerals: evidence from eyetracking.

Marjolein Korvorst1, Ardi Roelofs, Willem J M Levelt

  • 1Max Planck Institute for Psycholinguistics, Nijmegen, The Netherlands. korvorst@neuropsych.rwth-aachen.de

Quarterly Journal of Experimental Psychology (2006)
|April 19, 2006
PubMed
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Speakers plan and articulate speech incrementally. This study used eyetracking to show that utterance structure, like clock times versus house numbers, influences speech planning and articulation more than the task itself.

Area of Science:

  • Cognitive Psychology
  • Psycholinguistics
  • Speech Production

Background:

  • Speech production involves interleaving planning and articulation, a process known as incrementality.
  • Eyetracking and speech onset latency measurements are key methods for quantifying incrementality.

Purpose of the Study:

  • To investigate how production task (naming vs. reading) and utterance type (house numbers vs. clock times) affect the degree of speech incrementality.
  • To examine dissociations between planning (gaze duration) and articulation (speech onset latency) in different production contexts.

Main Methods:

  • Two eyetracking experiments were conducted.
  • Participants named complex numerals in Arabic format (Experiment 1) and read numerals in alphabetic format (Experiment 2) as house numbers and clock times.

Related Experiment Videos

  • Gaze durations and speech onset latencies were measured and compared.

    • Main Results:

    • Dissociations between gaze durations and speech onset latencies were observed in both tasks and utterance types, confirming incrementality.
    • For house numbers, factors influencing gaze duration did not affect speech onset latencies.
    • For clock times, numeral length primarily drove the dissociation between gaze duration and response latency in both tasks.

    Conclusions:

    • The degree of speech incrementality is primarily influenced by the utterance structure (e.g., clock times) rather than the specific production task (reading vs. naming).
    • Utterance structure plays a critical role in determining how speakers incrementally plan and articulate speech.