Positron Emission Tomographic Studies of the Processing of Singe Words

@article{Petersen1989PositronET,
  title={Positron Emission Tomographic Studies of the Processing of Singe Words},
  author={Steven E. Petersen and Peter T. Fox and Michael I. Posner and Mark A. Mintun and Marcus E. Raichle},
  journal={Journal of Cognitive Neuroscience},
  year={1989},
  volume={1},
  pages={153-170}
}
PET images of blood flow change that were averaged across individuals were used to identify brain areas related to lexical (single-word) processing, A small number of discrete areas were activated during several task conditions including: modality-specific (auditory or visual) areas activated by passive word input, primary motor and premotor areas during speech output, and yet further areas during tasks making semantic or intentional demands. 
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