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The validity of d' measures.

Astrid Vermeiren1, Axel Cleeremans

  • 1Consciousness, Cognition and Computation Group, Université Libre de Bruxelles, Brussels, Belgium. asvermei@ulb.ac.be

Plos One
|February 25, 2012
PubMed
Summary
This summary is machine-generated.

Subliminal perception research relies on d-prime (d prime) tasks to assess awareness. However, these tasks are unreliable, as target factors, attention, and response delays affect results, questioning their validity in measuring prime visibility.

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Area of Science:

  • Cognitive Psychology
  • Perception Research

Background:

  • Subliminal perception is defined as unconscious stimuli influencing target processing.
  • Assessing awareness of prime stimuli is crucial for subliminal perception research.
  • The d-prime (d') task is commonly used to measure awareness by assessing discrimination ability.

Purpose of the Study:

  • To investigate the reliability of the d-prime (d') task in assessing awareness of prime stimuli.
  • To determine if factors beyond awareness influence d-prime (d') task outcomes.
  • To re-evaluate the suitability of the d-prime (d') task for subliminal perception studies.

Main Methods:

  • Participants completed a priming task followed by a d-prime (d') task to assess awareness.
  • Experimental conditions manipulated target characteristics, attentional demands, and stimulus-response delays.
  • Statistical analyses examined the influence of these factors on d-prime (d') scores.

Main Results:

  • D-prime (d') task performance was significantly influenced by the nature of the target stimulus.
  • Attentional factors demonstrably affected participants' ability to discriminate primes.
  • The delay between stimulus presentation and response also impacted d-prime (d') outcomes.
  • These findings indicate that d-prime (d') is not a pure measure of prime visibility.

Conclusions:

  • The standard d-prime (d') task is not a straightforward or reliable measure of prime visibility in subliminal perception.
  • Methodological considerations, including target properties, attention, and timing, must be addressed.
  • Revisions to awareness assessment methods are necessary for advancing subliminal perception research.