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Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
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Crowdsourcing visual perception experiments: a case of contrast threshold.

Kyoshiro Sasaki1,2,3, Yuki Yamada2

  • 1Faculty of Science and Engineering, Waseda University, Tokyo, Japan.

Peerj
|December 26, 2019
PubMed
Summary

Online experiments can assess visual perception, specifically contrast thresholds, with results comparable to laboratory settings when trials are repeated. However, data exclusion remains a challenge for crowdsourced sensory perception studies.

Keywords:
Contrast thresholdOnline experimentPerceptionVision

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Area of Science:

  • Perceptual science
  • Psychophysics
  • Visual perception

Background:

  • Crowdsourcing is widely used in psychological research, but its application in sensory perception studies is limited.
  • Ensuring rigorous experimental settings in online environments for sensory perception is challenging.
  • The contrast threshold is a key measure in visual perception research.

Purpose of the Study:

  • To evaluate the suitability of online experiments for measuring basic visual perception, focusing on the contrast threshold.
  • To compare the reliability and validity of contrast threshold measurements obtained in laboratory versus online settings.
  • To identify potential challenges and areas for improvement in using crowdsourcing for sensory perception research.

Main Methods:

  • A comparative study design involving laboratory and online experimental conditions.
  • Three conditions were tested: laboratory experiment with repeated trials (n=24), online experiment without trial repetition (n=285), and online experiment with repeated trials (n=166).
  • Participants completed visual tasks to determine their contrast thresholds.

Main Results:

  • Significant equivalence was found in contrast thresholds between the laboratory and online conditions with repeated trials.
  • A substantial amount of data required exclusion in the online experiment with repeated trials.
  • Contrast thresholds were significantly higher in the online condition without trial repetition compared to the other two conditions.

Conclusions:

  • Online experiments with repeated trials are a viable method for assessing contrast thresholds, showing equivalence to laboratory settings.
  • Reducing data wastage is crucial for optimizing crowdsourcing in contrast threshold research.
  • Further methodological development is needed to enhance the suitability of crowdsourcing for sensory perception studies.