Extinction may alter the representation of a cue (e.g., it becomes less salient). To assess that idea, three groups learned to suppress mouse clicking in a video game in negative-patterning (X+/Y+/XY-) and positive-patterning (Z+/W+/ZW++) discriminations followed by extinction of X and Z. The negative-patterning discrimination should depend on a configural cue that is dependent on the representation of X and Y. Removal of the excitatory influence of X should further reduce responding to XY. In contrast, if extinction alters the representation of X, the original XY configural cue supporting the discrimination should also be changed, affecting inhibitory control, increasing responding to XY. Following patterning, groups received extinction in the same context as training (Ext A), a different context (Ext B), or received no extinction (no extinction). All stimuli were tested in Context A. Group no extinction showed negative patterning; suppression to X and Y was greater than to XY while suppression to Z, W, and ZW was equally strong. In group Ext A extinction reduced suppression to X, increased suppression to XY, reversed the X/XY discrimination, and weakened the Y/XY discrimination. Extinction of Z reduced suppression to Z with no effect on W or ZW. Group Ext B showed renewal of X and a renewal of the X/XY and Y/XY discriminations. Results suggest some form of representational change in X occurred during extinction disrupting the original XY configural cue that was dependent on that representation. Findings are discussed with respect to theories of associative learning. (PsycInfo Database Record (c) 2025 APA, all rights reserved).
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J Exp Psychol Anim Learn Cogn
January 2025
Universidad del Pais Vasco/Euskal Herriko Unibertsitatea, Procesos Basicos y Su Desarrollo.
Extinction may alter the representation of a cue (e.g., it becomes less salient).
View Article and Find Full Text PDFComp Biochem Physiol C Toxicol Pharmacol
October 2024
Department of Physiology and Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada. Electronic address:
Aspirin (Acetylsalicylic acid, ASA), one of the widely used non-steroid anti-inflammatory drugs can easily end up in sewage effluents and thus it becomes necessary to investigate the effects of aspirin on behaviour of aquatic organisms. Previous studies in mammals have shown ASA to alter fear and anxiety-like behaviours. In the great pond snail Lymnaea stagnalis, ASA has been shown to block a 'sickness state' induced by lipopolysaccharide injection which upregulates immune and stress-related genes thus altering behavioural responses.
View Article and Find Full Text PDFPsychopharmacology (Berl)
May 2024
Department of Psychiatry, Psychotherapy, and Psychosomatics, Psychiatric Hospital, University of Zurich, Lenggstrasse 31, 8008, Zurich, Switzerland.
Rationale: Previous work identified an attenuating effect of the matrix metalloproteinase (MMP) inhibitor doxycycline on fear memory consolidation. This may present a new mechanistic approach for the prevention of trauma-related disorders. However, so far, this has only been unambiguously demonstrated in a cued delay fear conditioning paradigm, in which a simple geometric cue predicted a temporally overlapping aversive outcome.
View Article and Find Full Text PDFHippocampus
February 2024
Institute of Behavioural Neuroscience, Division of Psychology & Language Sciences, University College London, London, UK.
Effective self-localization requires that the brain can resolve ambiguities in incoming sensory information arising from self-similarities (symmetries) in the environment structure. We investigated how place cells use environmental cues to resolve the ambiguity of a rotationally symmetric environment, by recording from hippocampal CA1 in rats exploring a "2-box." This apparatus comprises two adjacent rectangular compartments, identical but with directionally opposed layouts (cue card at one end and central connecting doorway) and distinguished by their odor contexts (lemon vs.
View Article and Find Full Text PDFQ J Exp Psychol (Hove)
July 2024
University of Nottingham, Nottingham, UK.
Three experiments explored whether weakening temporal contiguity between auditory cues and an aversive outcome attenuated cue competition in an avoidance learning task with human participants. Overall, with strong temporal contiguity between auditory cues and the outcome during training (the offset of the predictive auditory signals concurred with the onset of the outcome), the target cue trained as part of a compound yielded less avoidance behaviour than the control cue trained alone, an instance of overshadowing. However, weakening temporal contiguity during training (inserting a 5-s trace) attenuated overshadowing, resulting in similar avoidance behaviour in response to the control and target cues.
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