Marrocco, R. T., & Davidson, M. C. (1998), Neurochemistry of attention,публикация в R. Parasuraman (Ed.). The attentive brain (p. 35–50). Cambridge, MA: MIT Press.
А вот другая точка зрения:
Clerkin, S. M., Schulz, K. P., Halperin, J. M., Newcorn, J. H., Ivanov, I., Tang, C. Y., & Fan, J. (2009). Guanfacine potentiates the activation of prefrontal cortex evoked by warning signals. Biological Psychiatry, 66(4), 307–312.
