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Masked priming under the Bayesian microscope: Exploring the integration of local elements into global shape through

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Unconscious perception is possible: local elements group into global shapes even without awareness. This occurs for stimulus onset asynchronies (SOAs) over 50 ms, indicating SOA is key for unconscious global shape processing.

Keywords:
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Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Neuroscience

Background:

  • The relationship between awareness and visual processing is a fundamental question in cognitive science.
  • Previous research has explored whether complex visual information, such as shape perception, can occur outside of conscious awareness.

Purpose of the Study:

  • To determine if local visual elements are integrated into global shapes without conscious awareness.
  • To investigate the role of stimulus onset asynchrony (SOA) in unconscious shape processing.

Main Methods:

  • Employed two masked priming designs: a dissociation paradigm and a trial-wise probe discrimination task.
  • Manipulated prime visibility using varying prime-mask stimulus onset asynchronies (SOAs) and an unmasked condition.
  • Measured both objective performance and subjective awareness using the Perceptual Awareness Scale (PAS).

Main Results:

  • Trial-wise assessment of prime visibility disrupted masked priming, eliminating facilitation effects.
  • Bayesian regression models indicated that local elements group into global shapes unconsciously for SOAs exceeding 50 ms.
  • Prime-mask SOA was identified as a critical factor for processing global shapes without awareness.

Conclusions:

  • Evidence supports the hypothesis that unconscious visual processing allows for the integration of local elements into global shapes.
  • The duration of the stimulus onset asynchrony (SOA) significantly influences the extent of unconscious global shape formation.
  • These findings highlight the capacity for sophisticated visual perception to occur outside the bounds of conscious awareness.