Archive | May 2012

Devil’s Advocate: Uncorrected Stats and the Trouble With fMRI

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This rather technical post is a response to a recent Observer article by Vaughan Bell. In it he follows up on a recent internet discussion around the validity or otherwise of fMRI methods. A blog post by StokesBlog responded.  I must admit I hesitate to step into the fray. I think “flaws” in neuroimaging methods are sometimes overstated, but I don’t want people to think I am flawed, so perhaps I should keep my head down. Oh well, here goes…

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Identifying a Hidden Talent – Remembering Places

This is what my hippocampus would look like if my brain was made of frosted glass and it was glowing red (deep inside the temporal lobe, a few centimeters in from the ears). To get a better idea of where it is, watch this video.

In previous posts, I described the science behind the Four Mountains Test, a memory test which we developed using computer generated landscapes to assess the ability to recognize places from their layout even when the viewpoint changes. The test was designed from the outset to depend on a part of the brain, the hippocampus, which is important in forming new memories of the events we experience but also in maintaining a sense of direction and keeping track of where we are as we move about. We found that patients with damage to the hippocampus had particular difficulty with the test.

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The Four Mountains Test

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Think of the last time you attended a wedding. You can probably remember the room around you, the place where you sat, the other guests around you and so on. Forming this type of memory depends on the hippocampus, an ancient part of the brain that is buried deep in the temporal lobes, a few centimetres in from your ears. People with damage to the hippocampus are unable to form new long-lasting memories of events and it is also one of the first parts of the brain to be affected in Alzheimer’s Disease. Being able to test abilities that depend on a fully-functioning hippocampus could one day be useful in identifying more serious memory problems that might require further investigation and treatment.

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How do we remember places?

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How do we recognize places and why do we sometimes get lost? In everyday life we use many strategies to help us keep track of where we are and get quickly and directly to an intended destination. For example, we might look out for distinctive landmarks and signs, we might consult maps. People also talk about having a sense of direction, for example, you might be able to point accurately toward some distant location which you cannot see (think of a local shop for example), and you may be able to keep track of these locations as you move about. This is the first of three posts that look at the brain basis of such skills. Based on this understanding my colleagues and I developed a test to assess them. It is called the Four Mountains test and is featured in Channel 4’s Hidden Talent show (to be shown on Tuesday 15th May at 9pm). These posts give a flavour of the scientific background to the test.

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What is the point of twitter?

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This week we took the plunge and made our official @YorkPsychology twitter stream public by featuring it on the departmental home page. I can imagine some of my colleagues are wondering what the point of twitter is, or indeed whether it has one. If you are similarly puzzled, you might want to start by reading this gentle introduction by Prof Dorothy Bishop or @deevybee as she is known on twitter. Dorothy’s post explains how twitter works and has lots of great tips if you’re interested in giving it a go. However, I know that many people will think the whole thing sounds pointless. So what is the point? Read More…

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