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Decision-dependent aftereffects for faces.

Christian Walther1, Stefan R Schweinberger2, Gyula Kovács3

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Summary
This summary is machine-generated.

Perceptual ambiguity, not just physical similarity, drives adaptation-related aftereffects (AEs) in face identity perception. Task context determines if ambiguous stimuli induce these aftereffects.

Keywords:
AdaptationFace perceptionIdentityPlasticity

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Visual perception

Background:

  • Adaptation-related aftereffects (AEs) bias perception away from preceding stimuli.
  • Previous research indicated both ambiguity and similarity influence face identity AEs.
  • The precise role of perceptual ambiguity in inducing AEs required further investigation.

Purpose of the Study:

  • To investigate the role of task-defined perceptual ambiguity in adaptation-related aftereffects (AEs) for face identity.
  • To determine if AEs are induced by stimuli that are ambiguous or unambiguous within a specific task context.

Main Methods:

  • Creation of two overlapping face continua (A-B-C and B-C-D) using morphing techniques.
  • Participants performed classification tasks on these continua, with stimuli being either task-ambiguous or task-unambiguous.
  • Adaptation-related aftereffects were measured following exposure to specific adaptor faces within an AE paradigm.

Main Results:

  • Contrastive AEs were observed for task-ambiguous target identities (B in the first session, C in the second).
  • No significant AEs were found for task-unambiguous target identities (A, C in the first session; B, D in the second).
  • The induction of AEs was dependent on the perceptual ambiguity of the target stimulus within the given task.

Conclusions:

  • Perceptual ambiguity, defined by the task context, is a critical determinant for inducing adaptation-related aftereffects in face identity perception.
  • These findings refine our understanding of how contextual factors modulate visual aftereffects.
  • The study highlights the dynamic nature of perceptual adaptation and its reliance on task demands.