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When expectation confounds iconic memory.

Talis Bachmann1, Jaan Aru2

  • 1Faculty of Law, Institute of Penal Law, University of Tartu (Tallinn Branch), Estonia.

Consciousness and Cognition
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Summary
This summary is machine-generated.

Researchers question findings that challenge the existence of an attention-free phenomenal iconic store. Prior experience may create illusory perceptions of letters, influencing experimental results.

Keywords:
AttentionIconic memoryPrecisionPredictive codingPrior

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Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Human Memory

Background:

  • Methodological criticisms have been raised regarding the interpretation of experimental results concerning the phenomenal iconic store.
  • Previous studies (Mack, Erol, & Clarke, 2015) interpreted findings against the existence of an attention-free phenomenal iconic store.
  • Mack, Erol, Clarke, and Bert (2016) presented new data to support their stance, responding to critiques (Bachmann & Aru, 2015).

Purpose of the Study:

  • To re-evaluate and question the conclusions presented by Mack, Erol, Clarke, and Bert (2016).
  • To investigate the role of expectancy in visual perception within the context of iconic memory experiments.
  • To propose an alternative explanation for the observed results in the 2016 study.

Main Methods:

  • Analysis of experimental conditions where participants were unexpectedly prompted to report absent stimuli (letters).
  • Examination of the 101st trial in the Mack et al. (2016) experiment, where letters were absent but participants reported them.
  • Focus on the potential influence of prior trial experience on participant responses.

Main Results:

  • Participants may have failed to perceive the empty display area accurately.
  • Expectancy, based on preceding trials with letters, likely induced an illusory experience of letter-like objects.
  • The results suggest that prior experience, not necessarily an attention-free store, influenced the perception of stimuli.

Conclusions:

  • The existence of an attention-free phenomenal iconic store remains debatable.
  • Illusory perceptions, driven by expectancy, can significantly impact the interpretation of iconic memory experiments.
  • Further research is needed to disentangle the effects of expectancy from the properties of iconic memory itself.