Feature
Trawling the brain
New findings raise questions about reliability of fMRI as gauge of neural activity
The 18-inch-long Atlantic salmon lay perfectly still for its brain scan. Emotional pictures —a triumphant young girl just out of a somersault, a distressed waiter who had just dropped a plate — flashed in front of the fish as a scientist read the standard instruction script aloud. The hulking machine clunked and whirred, capturing minute changes in the salmon’s brain as it assessed the images. Millions of data points capturing the fluctuations in brain activity streamed into a powerful computer, which performed herculean number crunching, sorting out which data to pay attention to and which to ignore.
