Think fast: Speed of thought and perception limited by unified neocortical gateway

(Medical Xpress) -- Historically, perceptual and response rates when multitasking have been interpreted as being limited by independent bottlenecks. While a more recent view suggests that a common bottleneck might be the cause, experimental evidence for its existence have not been determinative. Recently, however, researchers at Vanderbilt University used time-resolved functional magnetic resonance imaging (fMRI) – where both the topography and temporal sequence of cortical activation across brain regions is examined – to identify a unified attentional bottleneck – a network of regions that apparently limits the speeds at which perceptual encoding and decision-making can occur.

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