Feeds

Schizophrenics fall for no illusions

Paranoid? Its all about context

Choosing a cloud hosting partner with confidence

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. ®

Security for virtualized datacentres

More from The Register

next story
MEN: For pity's sake SLEEP with LOTS of WOMEN - and avoid Prostate Cancer
And, um, don't sleep with other men. If that's what worries you
Voyager 1 now EIGHTEEN LIGHT HOURS from home
Almost 20 BEEELION kilometres from Sol
Jim Beam me up, Scotty! WHISKY from SPAAACE returns to Earth
They're insured for $1m, before you thirsty folks make plans
ROGUE SAIL BOAT blocks SPACE STATION PODULE blastoff
Er, we think our ISS launch beats your fishing expedition
Comet Siding Spring revealed as flying molehill
Hiding from this space pimple isn't going to do humanity's reputation any good
BAE points electromagnetic projectile at US Army
Railguns for 'Future fighting vehicle'
OK Google, do I have CANCER?
Company talks up pill that would spot developing tumors
LONG ARM of the SAUR: Brachially gifted dino bone conundrum solved
Deinocheirus mirificus was a bit of a knuckle dragger
prev story

Whitepapers

Why and how to choose the right cloud vendor
The benefits of cloud-based storage in your processes. Eliminate onsite, disk-based backup and archiving in favor of cloud-based data protection.
Getting started with customer-focused identity management
Learn why identity is a fundamental requirement to digital growth, and how without it there is no way to identify and engage customers in a meaningful way.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Saudi Petroleum chooses Tegile storage solution
A storage solution that addresses company growth and performance for business-critical applications of caseware archive and search along with other key operational systems.
Protecting against web application threats using SSL
SSL encryption can protect server‐to‐server communications, client devices, cloud resources, and other endpoints in order to help prevent the risk of data loss and losing customer trust.