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Related Experiment Video

Updated: Sep 8, 2025

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Conscious awareness determines whether a second learning session disrupts or facilitates earlier learning.

Patrick Bruns1, Kazuhisa Shibata2, Takeo Watanabe3

  • 1Department of Cognitive, Linguistic, and Psychological Sciences, Brown University, 190 Thayer Street, Providence, RI 02912, USA; Biological Psychology and Neuropsychology, University of Hamburg, Von-Melle-Park 11, 20146 Hamburg, Germany.

Current Biology : CB
|September 6, 2025
PubMed
Summary

New learning can disrupt prior memory, known as retrograde interference (RI). However, this study found that subthreshold training unexpectedly improved performance, demonstrating retrograde facilitation (RF) in visual perceptual learning.

Keywords:
conscious awarenessmotion perceptionperceptual learningplasticityretrograde facilitationretrograde interferencevision

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Learning and memory are susceptible to disruption by subsequent training, a phenomenon termed retrograde interference (RI).
  • This disruption is often attributed to interfering interactions between successive learning tasks before initial learning stabilizes.
  • Previous research has primarily focused on the disruptive effects of RI in various learning paradigms.

Purpose of the Study:

  • To investigate the effect of subthreshold training on previously acquired learning.
  • To explore the phenomenon of retrograde facilitation (RF) as a potential counterpoint to retrograde interference (RI).
  • To examine the role of temporal intervals and conscious awareness in modulating interactions between successive learning sessions.

Main Methods:

  • Visual perceptual learning (VPL) experiments involving two successive training sessions on coherent motion directions.
  • Comparison of training outcomes with suprathreshold (10% coherence) versus subthreshold (5% coherence) stimuli.
  • Manipulation of the temporal gap between successive training sessions (immediate vs. 1-hour interval).

Main Results:

  • Suprathreshold training resulted in retrograde interference (RI), impairing performance on the first task.
  • Subthreshold training, when conducted without a temporal gap, led to retrograde facilitation (RF), enhancing performance on the first task.
  • Retrograde facilitation (RF) was not observed when a 1-hour interval separated the subthreshold training sessions, suggesting a critical role for learning stabilization.

Conclusions:

  • Subthreshold training can unexpectedly enhance prior learning through retrograde facilitation (RF), challenging the universality of retrograde interference (RI).
  • The timing of successive learning sessions is crucial; immediate training promotes facilitation, while delayed training may lead to interference.
  • Conscious awareness may play a role in transforming potentially facilitative interactions into disruptive ones during learning.