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Volume 6 Issue 3, March 2003

Which column comes next in the series? Such questions are often used in measures of general intelligence. Jeremy Gray and colleagues report that individuals who score high on a test of general fluid intelligence also show increased fMRI activity in brain areas involved in attention, including the lateral prefrontal cortex. This correlation was apparent only when participants were performing a demanding memory task. Therefore, individual differences in general intelligence might depend in part on differences in neural systems involved in the control of attention. (The correct answer is A.) See pages 207 and 316.

Volume 6 Issue 3

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  • A functional imaging study relates general intelligence to brain systems involved in cognitive control. In prefrontal cortex and selected regions elsewhere that are known to be activated during cognitive conflict, intelligence test score predicts the response to a challenging task.

    • John Duncan
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  • A new paper shows that excitatory and inhibitory neuromodulators can change the firing properties of spinal cord neurons, with implications for pain processing.

    • Eve Marder
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  • A recent article in Nature suggests that inhibitory feedback can switch the firing of sensory neurons between two signaling modes that may be used to process distinct sensory stimuli.

    • Fabrizio Gabbiani
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