In this My Word, Joseph LeDoux describes how his work as a graduate student got him interested in human consciousness. Although he has not studied this topic since 1970s, he never stopped thinking and writing about it during his four-decade career exploring how non-conscious processes involving the amygdala detect and respond to danger. Here, he tells us what is on his mind about consciousness these days.
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Individual differences in prioritization for consciousness and the conscious detection of changes.
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March 2025
Department of Psychology, The Hebrew University of Jerusalem, Israel; The Federmann Center for the Study of Rationality, The Hebrew University of Jerusalem, Israel. Electronic address:
A recent discovery documented robust and reliable individual differences in how quickly people become aware of non-conscious visual stimuli (Sklar, Goldstein, et al., 2021). Given the seemingly large role that conscious experiences play in our lives, this trait is likely to be associated with later cognitive, emotional, and motivational processes.
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iScience
February 2025
Lyon Neuroscience Research Center, Neurobiology and Plasticity of Olfactory Perception Team, University Lyon1, Inserm U1028 - CNRS UMR5292, Lyon, France.
The rose is the most cultivated ornamental plant in the world, and one of the reasons is that its fragrance is highly pleasant to humans. This raises the question of which volatile organic compounds (VOCs) emitted by flowers are involved in a rose odor-induced positive emotional response. Here, we invited participants to smell and rate the perceptual characteristics of roses whose VOCs were quantified.
View Article and Find Full Text PDFNon-Conscious Detection of "Missed" Lung Nodules by Radiologists: Expanding the Boundaries of Successful Processing During the Visual Assessment of Chest CT Scans.
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February 2025
Department of Radiology, University of Massachusetts, Chan Medical School, Worcester, MA.
Background Diagnostic error rates for detecting small lung nodules on chest CT scans remain high at 50%, despite advances in imaging technology and radiologist training. These failure rates may stem from limitations in conscious recognition processes. However, successful visual processes may be detecting the nodule independent of the radiologist's report.
View Article and Find Full Text PDFIn Search of an Integrative Method to Study Unconscious Processing: An Application of Bayesian and General Recognition Theory Models to the Processing of Hierarchical Patterns in the Absence of Awareness.
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Instituto Pluridisciplinar, Universidad Complutense de Madrid, Madrid, Spain.
The dissociation between conscious and unconscious perception is one of the most relevant issues in the study of human cognition. While there is evidence suggesting that some stimuli might be unconsciously processed up to its meaning (e.g.
View Article and Find Full Text PDFPreliminaries to artificial consciousness: A multidimensional heuristic approach.
Phys Life Rev
March 2025
Institute of Intelligent Systems and Robotics, CNRS, Sorbonne University, Paris, France.
The pursuit of artificial consciousness requires conceptual clarity to navigate its theoretical and empirical challenges. This paper introduces a composite, multilevel, and multidimensional model of consciousness as a heuristic framework to guide research in this field. Consciousness is treated as a complex phenomenon, with distinct constituents and dimensions that can be operationalized for study and for evaluating their replication.
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