#NakedScientist: What causes déjà vu?

Naked Scientist Chris Smith says there is no complete explanation for the phenomenon of déjà vu and that there are ethical constraints if scientists were to test it out.

But what are the possible reasons behind the overwhelming sense of familiarity with something that shouldn't be familiar at all?

Smith explains what appears to be happening in the brain when you experience déjà vu.

The circuit in the brain that triggers that flash of familiarity seems to be inappropriately engaged at certain moments so when we think we recognise something or somebody, as well as you are recalling information abut them, there is a second circuit in the brain that gives you that reflection and sudden inspiration.

Chris Smith, Naked Scientist

It would appear that when you get these funny experiences, it is that circuit turned on when it shouldn't be.

Chris Smith, Naked Scientist

This can happen for a range of reasons. Sometimes it can be that an experience is so close to a thing you do remember that the two memories get confused. The other is that when you are tired - sleep deprevation and stress can all provoke this.

Chris Smith, Naked Scientist

Click on the link below to hear more from the Naked Scientist....


Recommended

by NEWSROOM AI
Read More
[LISTEN] Naked Scientist:  How easy is it to reverse a vasectomy?

[LISTEN] Naked Scientist: How easy is it to reverse a vasectomy?

Scientist Chris Smith explains the procedure and how it can be reversed.

[LISTEN] Naked Scientist: Here is what sleep does for your brain

[LISTEN] Naked Scientist: Here is what sleep does for your brain

Chris Smith explains how the brain accumulates various bits of 'biochemical rubbish' during the day and how sleep impact this.

[LISTEN] #NakedScientist: Very first lab-grown oesophagus implanted in mice

[LISTEN] #NakedScientist: Very first lab-grown oesophagus implanted in mice

Experiment will hopefully lead to clinical trials of food pipes for kids born with part of their oesophagus damaged or missing.

Scientists are still looking at why salt causes high blood pressure

Scientists are still looking at why salt causes high blood pressure

The Naked Scientist Dr Chris Smith answers science questions including why cockroaches lie on their back when they die.

[LISTEN] Naked Scientist: Where does sea foam come from?

[LISTEN] Naked Scientist: Where does sea foam come from?

Naked Scientist Chris Smith answers this and other scientific questions.

New breakthrough will help target optimum cancer drugs for use in patients

New breakthrough will help target optimum cancer drugs for use in patients

The Naked Scientist Chris Smith answers all things science - from diseases to birds and why the second tooth doesn't grow back.

Popular articles
Caster Semenya calls out IAAF for publicising expert witness list

Caster Semenya calls out IAAF for publicising expert witness list

Olympic champ Caster Semenya is challenging proposed IAAF rules that may force her to lower her testosterone levels.

'Parliament should have proper inquiry into Mkhwebane's fitness to hold office'

'Parliament should have proper inquiry into Mkhwebane's fitness to hold office'

DA's John Steenhuisen says Parliament should investigate the public protector after the findings against her.

I had nothing to do with VBS - Florence Radzilani

I had nothing to do with VBS - Florence Radzilani

Vhembe District former mayor Florence Radzilani says the Provincial Forensic Investigation exonerated her from the VBS scandal.

Pule Mabe was never alone in hotel room with assistant - ANC NEC's Sdumo Dlamini

Pule Mabe was never alone in hotel room with assistant - ANC NEC's Sdumo Dlamini

ANC's Sdumo Dlamini says party spokesperson Pule Mabe free to return to work after he being cleared of sexual harassment charges.

Black gay men can be misogynists, and here's what a few have to say about it

Black gay men can be misogynists, and here's what a few have to say about it

Presenter Eusebius McKaiser hosted a panel discussion with black gay men exploring entrenched patriarchy and the dynamics at play.

Why rooibos tea price remains high despite improved rains

Why rooibos tea price remains high despite improved rains

MD at Rooibos Ltd, Martin Bergh explains the current high price of Rooibos tea.

[WATCH] Owner catches car thief off guard and thwarts vehicle theft in Springs

[WATCH] Owner catches car thief off guard and thwarts vehicle theft in Springs

The vehicle's owner came out of the store just in time to scare away the man attempting to steal his bakkie.

Johannesburg’s drive to create a smart city is rolling out

Johannesburg’s drive to create a smart city is rolling out

Vumatel is deploying 15 000 CCTV security cameras over the next five years to make Joburg's streets safer.