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Blind Procedures02:07

Blind Procedures

Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which child was...

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Online Eye Tracking for Aphasia: A Feasibility Study Comparing Web and Lab Tracking and Implications for Clinical

Willem S van Boxtel1,2, Michael Linge1, Rylee Manning1

  • 1Department of Speech, Language, and Hearing Sciences, Purdue University, West Lafayette, Indiana, USA.

Brain and Behavior
|October 29, 2024
PubMed
Summary

Web-based eye tracking effectively identifies language processing differences in aphasia patients, similar to lab methods. This accessible technology can expand research on language impairments, despite a slight delay in data.

Keywords:
WebGazeraphasiaclinical researchlanguage comprehensiononline eye trackingwebcam eye tracking

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Area of Science:

  • Neuroscience
  • Psycholinguistics
  • Rehabilitation Science

Background:

  • Eye-tracking is crucial for studying language disorders like aphasia.
  • Clinical studies often have small sample sizes, limiting generalizability.
  • Webcam-based eye tracking offers a scalable solution but needs validation.

Purpose of the Study:

  • To compare the sensitivity of web-based vs. in-lab eye tracking for detecting language processing differences.
  • To assess the feasibility of webcam-based eye tracking in aphasia research.

Main Methods:

  • 16 post-stroke aphasia patients and 16 controls completed sentence-picture matching tasks.
  • Tasks were performed both in-lab (EyeLink) and online (WebGazer.js).
  • Session order was counterbalanced to minimize bias.

Main Results:

  • Both methods detected significant differences in accuracy and response time between patients and controls.
  • Web and lab tracking showed comparable sensitivity in identifying group differences across sentence types.
  • Web tracking exhibited a slight delay (500-800 ms) compared to lab tracking.

Conclusions:

  • Web-based eye tracking is a viable and sensitive tool for studying aphasia.
  • This method can help overcome sample size limitations in clinical research.
  • Further validation of webcam-based tracking is recommended for broader applications.