Closing the mind's eye: deactivation of visual cortex related to auditory task difficulty.
Hairston WD, Hodges DA, Casanova R, Hayasaka S, Kraft R, Maldjian JA, Burdette JH. Closing the mind's eye: deactivation of visual cortex related to auditory task difficulty. Neuroreport. 2008 Jan 22; 19(2):151-4.