Feeds

Schizophrenics fall for no illusions

Paranoid? Its all about context

5 things you didn’t know about cloud backup

The paranoia, or sense of persecution, experienced by some schizophrenics could be due to a problem they have processing contextual information, according to researchers at University College London (UCL).

Researchers at the London university found that schizophrenics are not fooled by visual illusions that easily trick non-schizophrenics.

Volunteers were shown high-contrast black and white patterned images, with sections altered so that the level of contrast is much lower. They were then asked effectively to match the contrast of the altered section to its twin in a line up of otherwise identical shapes.

The illusion. Image credit: UCL

Schizophrenics find this task relatively easy, because their brain takes no account of the surrounding information when judging the level of contrast in the altered section of the pattern. Non-schizophrenic brains, however, make relative judgments about the altered section, because of the surrounding higher contrast pattern.

Dr Steven Dakin, of the UCL Institute of Ophthalmology, commented: "We often think of people with schizophrenia as not seeing the world the way it really is - for example, during hallucinations - but we have shown that sometimes their vision can be more accurate than non-sufferers."

He explained that people who do well at this kind of task, tend to do so for a very specific reason, while poor performance can be due to a number of different factors.

"Our findings may shed some light on the brain mechanisms involved in schizophrenia," he added.

"Normally, contextual processes in the brain help us to focus on what’s relevant and stop our brains being overwhelmed with information. This process seems to be less effective in the schizophrenic brain, possibly due to insufficient inhibition - that is, the process by which cells in the brain switch each other off."

He suggests that if this is part of a more general problem in dealing with information about context, it could explain why many schizophrenics misinterpret people's actions, and can feel persecuted.

The research is reported in the journal Biology. ®

Build a business case: developing custom apps

More from The Register

next story
Boffins ID freakish spine-smothered prehistoric critter: The CLAW gave it away
Bizarre-looking creature actually related to velvet worms
ANU boffins demo 'tractor beam' in water
The current state of the art, apparently
China to test recoverable moon orbiter
I'll have some rocks and a moon cheese pizza please, home delivery
NASA's rock'n'roll shock: ROLLING STONE FOUND ON MARS
No sign of Ziggy Stardust and his band
What does a flashmob of 1,024 robots look like? Just like this
Sorry, Harvard, did you say kilobots or KILLER BOTS?
Why your mum was WRONG about whiffy tattooed people
They're a future source of RENEWABLE ENERGY
Vulture 2 spaceplane autopilot brain surgery a total success
LOHAN slips into some sexy bespoke mission parameters
Another step forward for diamond-based quantum computers
Square cut or pear-shaped, these qubits don't lose their shape
LOHAN acquires aircraft arboreal avoidance algorithm acronyms
Is that an ARMADILLO in your PANTS or are you just pleased to see me?
prev story

Whitepapers

Endpoint data privacy in the cloud is easier than you think
Innovations in encryption and storage resolve issues of data privacy and key requirements for companies to look for in a solution.
Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Top 8 considerations to enable and simplify mobility
In this whitepaper learn how to successfully add mobile capabilities simply and cost effectively.
Solving today's distributed Big Data backup challenges
Enable IT efficiency and allow a firm to access and reuse corporate information for competitive advantage, ultimately changing business outcomes.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.