165,259 research outputs found
Déjà vu experiences in healthy subjects are unrelated to laboratory tests of recollection and familiarity for word stimuli
No full textRecent neuropsychological and neuroscientific research suggests that people who experience more déjà vu display characteristic patterns in normal recognition memory. We conducted a large individual differences study (n = 206) to test these predictions using recollection and familiarity parameters recovered from a standard memory task. Participants reported déjà vu frequency and a number of its correlates, and completed a recognition memory task analogous to a Remember-Know procedure. The individual difference measures replicated an established correlation between déjà vu frequency and frequency of travel, and recognition performance showed well-established word frequency and accuracy effects. Contrary to predictions, no relationships were found between déjà vu frequency and recollection or familiarity memory parameters from the recognition test. We suggest that déjà vu in the healthy population reflects a mismatch between errant memory signalling and memory monitoring processes not easily characterised by standard recognition memory task performance.Peer reviewe
The persistence of erroneous familiarity in an epileptic male : Challenging perceptual theories of déjà vu activation
No full textWe report the case of a 39-year-old, temporal lobe epileptic male, MH. Prior to complex partial seizure, experienced up to three times a day, MH often experiences an aura experienced as a persistent sensation of deja vu. Data-driven theories of deja vu formation suggest that partial familiarity for the perceived stimulus is responsible for the sensation. Consequently, diverting attention away from this stimulus should cause the sensation to dissipate. MH, whose sensations of deja vu persist long enough for him to shift his perceptual focus a number of times during the experience, spontaneously reports that these shifts make no difference to the sensation experienced. This novel observation challenges data-driven theories of deja vu formation which have been used to explain the occurrence of deja vu in those with temporal lobe epilepsy and the general population. Clearly, in epilepsy, erratic neuronal firing is the likely contributor, and in this paper we postulate that such brain firing causes higher-order erroneous 'cognitive feelings'. We tentatively extend this account to the general population. Rather than being a reaction to familiar elements in perceptual stimuli, deja vu is likely to be the result of a cognitive feeling borne of the erroneous activation of neural familiarity circuits such as the parahippocampal gyrus, persisting as long as this activation persists. (c) 2008 Elsevier Inc. All rights reserved.Peer reviewe
The awareness of novelty for strangely familiar words : a laboratory analogue of the déjà vu experience
Get PDFAkira O’Connor is supported by a SINAPSE (Scottish Imaging Network: A Platform for Scientific Excellence) fellowship. Josephine Urquhart was supported by the University of St Andrews URIP Scheme.Déjà vu is a nebulous memory experience defined by a clash between evaluations of familiarity and novelty for the same stimulus. We sought to generate it in the laboratory by pairing a DRM recognition task, which generates erroneous familiarity for critical words, with a monitoring task by which participants realise that some of these erroneously familiar words are in fact novel. We tested 30 participants in an experiment in which we varied both participant awareness of stimulus novelty and erroneous familiarity strength. We found that déjà vu reports were most frequent for high novelty critical words (~25%), with low novelty critical words yielding only baseline levels of déjà vu report frequency (~10%). There was no significant variation in déjà vu report frequency according to familiarity strength. Discursive accounts of the experimentally-generated déjà vu experience suggest that aspects of the naturalistic déjà vu experience were captured by this analogue, but that the analogue was also limited in its focus and prone to influence by demand characteristics. We discuss theoretical and methodological considerations relevant to further development of this procedure and propose that verifiable novelty is an important component of both naturalistic and experimental analogues of déjà vu.Peer reviewe
Déjà Vu in the Laboratory : A Behavioral and Experiential Comparison of Posthypnotic Amnesia and Posthypnotic Familiarity
No full textThis experiment aimed to create a laboratory analogue of deja vu. During hypnosis, 1 group of high hypnotizables completed a puzzle game and then received a posthypnotic amnesia suggestion to forget the game (PHA condition). Another group of highs were not given the game but received a posthypnotic familiarity suggestion that it would feel familiar (PHF condition). After hypnosis, all participants were given the game and described their reactions to it. Whereas 83% of participants in both conditions passed their respective suggestions, more in the PHF condition felt a sense of deja vu. An EAT inquiry revealed that they experienced sensory fascination and confusion about the source of familiarity, akin to everyday deja vu. These findings highlight the value of using hypnosis as a laboratory analogue of deja vu and provide a framework for investigating clinical manifestations of this phenomenon.Peer reviewe
Chinautla : Groupe A vu du groupe D
No full textChinautla, (ruiens dites de Mixco Viejo), Estado de Chimaltenango, Guatémala Groupe A vu du groupe D, en direction Nord Nord-Ouest
The Pak-US Déjà vu
No full textA commentary in this column last week analysed the Trump surge on Afghanistan, looking at the rationale behind the new American approach. One expected that there would be more discussions and critiques of the new Afghan surge and whether it would address the challenges facing the Ghani government in Kabul. An offshoot of this new Afghan strategy however has been fallouts of Trump’s approach on the relations between Pakistan and the US.
Following Trump’s speech, there has been a spate of negative responses from every actor – from the media to Parliament in Pakistan condemning the US, especially the White House. If the threats against Pakistan by US are a repeat of earlier statements at the highest level from the American administration, the reactions appear familiar. Almost a déjà vu.
So, what next in US-Pakistan relations
Legendrian links and d\'ej\`a vu moments
Get PDFA Legendrian link is called a d\'ej\`a vu link if its components can be
connected by a positive Legendrian isotopy but this isotopy cannot be embedded.
This is the contact geometric analogue of a pair of events in a spacetime such
that there are d\'ej\`a vu moments on every future-directed timelike path
between them. We construct d\'ej\`a vu links in several geometrically relevant
situations and discuss their basic properties.Comment: V.2 - small edits incorporating referee comments, references added;
20 pages, 4 figure
Fig 2. – Dendrocalamus velutinus N.-H. Xia, V. T. Nguyen & V. D in Dendrocalamus velutinus N.-H. Xia, V. T. Nguyen & V. D. Vu (Poaceae), a new species from Vietnam
No full textFig 2. – Dendrocalamus velutinus N.-H. Xia, V. T. Nguyen & V. D. Vu. A. Habit; B. Culm sheath. [Photos by V. T. Nguyen]Published as part of Nguyen, Van Tho, Le, Viet Lam, Vu, Van Dung & Xia, Nian-He, 2012, Dendrocalamus velutinus N.-H. Xia, V. T. Nguyen & V. D. Vu (Poaceae), a new species from Vietnam, pp. 255-259 in Candollea 67 (2) on page 258, DOI: 10.15553/c2012v672a6, http://zenodo.org/record/571021
Dèjà vu - Eine Kleiderkollektion
No full textDer Grundgedanke der Kollektion ist, durch das Verwenden bekannter Bekleidungsteile, ein unbekanntes, neues und zeitgemäßes Outfit zu schaffen. Auf Basis eines erarbeiteten Fundus unterschiedlicher Sortimente aus den verschiedenen Dekaden des 20. Jahrhunderts wurden zum Beispiel Blusen, Hemden, Hosen und Jacken mittels der Technik des Collagierens zusammen gefügt. Der Effekt bei dem ersten Wahrnehmen der Kollektion soll dem Dèjà vu nahe stehen. Dieses Wahrnehmungserlebnis beschreibt einen Moment des Geschehens, in dem man glaubt diesen Augenblick bereits erlebt zu haben. Ein Dèjà vu ist zum Zeitpunkt der Begebenheit sehr realistisch. Man ist sich sicher, das einem diese Situation schon einmal widerfahren ist, aber kurze Zeit später, oft nur ein paar Sekunden, ist dieses Gefühl bereits sehr vage und verschwommen. Im Bezug auf die Kollektion ist das Dèjà vu ein kurzes Wahrnehmungserlebnis hinsichtlich der einzelnen Outfits. Beim ersten Eindruck der einzelnen Modelle soll das Gefühl vermittelt werden, dass diese Form bereits existiert hat. Aber kurze Zeit später ist man sich dieser Empfindung nicht mehr sicher. Si
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