You’ve got 20/20 vision if you can spot the hidden seashell in less than 5 seconds

Only those with the best eyesight can crack this tricky brainteaser.

Brainteasers are a great way to push one of the body’s most important organs to limits and give it some much-needed exercise.

They can come in many different forms. They can be analytical, mathematical, or observational. Mathematical brainteasers ask users to solve an equation while analytical brainteasers ask people to solve a riddle.

Observational brainteasers, such as the image above from FishInAquarium, ask users to spot anomalies in images in the shortest time possible. Your task is to try and spot the hidden seashell in under five seconds.

The key to solving this brainteaser is to scan the image very quickly and accurately from left to right or up and down in order to find the seashell.


    Did you spot the seashell? No worries if not, the answer is circled above. While brainteasers may seem like a casual way to kill time while travelling on the bus or in a waiting room, they can play a crucial role in keeping the mind sharp.

    Brainteasers help the mind stay sharp in the same way riding a bike or lifting weights keeps the body’s muscles healthy. The more healthy stimulation the mind has, the less likely it is to develop neurodegenerative conditions such as dementia.

    This doesn’t mean brainteasers will prevent dementia, other factors can have a much bigger influence such as diet and exercise. Dementia is one of the biggest killers in the UK affecting just under one million people.

    According to the charity, Alzheimer’s Society, the number of people living with dementia in the UK is expected to rise to 1.6million by 2040.

    Speaking to last year after the publication of a report about rising cases, chief medical officer at Alzheimer’s Research UK Professor Jonathan Schott said: “Decades of hard work have brought us to a tipping point – particularly with the first new Alzheimer’s drugs in over 20 years finally on the horizon.

    “We’re also seeing revolutionary new diagnostics showing real promise, with blood tests for Alzheimer’s now poised to enter the clinic. So, while the findings of this report are concerning, there is hope and optimism on the horizon too.

    “It’s time for policy-makers to double-down on action to protect the nation’s brain health, and address inequalities that put some people at an unfair disadvantage.”

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