Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

A stunning new look at déjà vu

29.11.2006
A blind man suffering déjà vu. It sounds like a contradiction in terms – but the first case study of its kind has turned the whole theory of déjà vu on its head.

Traditionally it was thought images from one eye were delayed, arriving in the brain microseconds after images from the other eye – causing a sensation that something was being seen for the second time.

But University of Leeds researchers report for the first time the case of a blind person experiencing déjà vu through smell, hearing and touch.

The University is a world-leader in déjà vu research. The ground-breaking work of the University’s Institute of Psychological Sciences has been widely published in both the scientific and the news media. Their work is particularly aimed at understanding chronic déjà vu, where patients are constantly plagued by the feeling of having “been here before”.

... more about:
»déjà »experiences

In a new paper published in the journal Brain and Cognition*, researchers Akira O’Connor and Chris Moulin relate how mundane experiences – undoing a jacket zip while hearing a particular piece of music; hearing a snatch of conversation while holding a plate in the school dining hall – were examples of how deja experiences were triggered in the blind subject.

“It is the first time this has been reported in scientific literature,” said O’Connor. “It’s useful because it provides a concrete case study which contradicts the theory of optical pathway delay. Eventually we would like to talk to more blind people, though there’s no reason to believe this man’s experiences are abnormal or different to those of others.

“Optical pathway delay is a quite antiquated theory, but still widely believed – and was the basis for the déjà vu sequences in Joseph Heller’s novel Catch-22. But this provides strong evidence that optical pathway delay is not the explanation for déjà vu. The findings are so obvious, so intuitive, that it’s remarkable this research has never been done before.”

O’Connor admits that to the person experiencing déjà vu, it feels almost inexplicable. “And because it feels so subjective, psychology, in striving for objectivity, has tended to shy away from it. But psychologists have gone some way to illuminating things like the ‘tip of my tongue’ sensation when you can’t think of a particular word. We just wanted to get to the same sort of understanding for déjà vu.”

O’Connor’s thesis, due to be completed next year, examines the experimental induction of déjà vu through hypnosis. “We now believe that deja experiences are caused when an area of the brain that deals with familiarity gets disrupted,” he said.

In one experiment, students are asked to remember words, then hypnotised to make them forget – and then shown the same word again to induce a feeling that they have seen it before. Around half said this brought on a sensation similar to déjà vu – half of whom said it was definitely déjà vu.

O’Connor would like to take the research further: “It would be really neat to do some neuro-imaging on people during genuine spontaneous déjà vu experiences – but it’s very difficult to get them to have them on demand…”

Simon Jenkins | alfa
Further information:
http://www.leeds.ac.uk

Further reports about: déjà experiences

More articles from Life Sciences:

nachricht Water world
20.11.2017 | Washington University in St. Louis

nachricht Carefully crafted light pulses control neuron activity
20.11.2017 | University of Illinois at Urbana-Champaign

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

Im Focus: Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs

Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.

During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....

Im Focus: Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.

Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...

Im Focus: Wrinkles give heat a jolt in pillared graphene

Rice University researchers test 3-D carbon nanostructures' thermal transport abilities

Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

Antarctic landscape insights keep ice loss forecasts on the radar

20.11.2017 | Earth Sciences

Filling the gap: High-latitude volcanic eruptions also have global impact

20.11.2017 | Earth Sciences

Water world

20.11.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>