Neuroimaging and behavior: probing brain behavior relationships in the 21st century.

Functional neuroimaging over the past decade has provided a new way to examine brain behavior relationships. Current noninvasive neuroimaging techniques, which can examine structure and function, have begun to clarify the networks involved in cognitive processes and how these are affected in aging and disease. Functional magnetic resonance imaging (fMRI) has demonstrated the interaction between medial temporal and prefrontal regions in episodic memory. The anatomical correlates of various components of spatial attention and working memory have emerged from elegant event-related fMRI designs. Distinct neural networks for different emotions are being mapped out, and the role of the anterior cingulate in depressed mood has been documented. This review highlights key recent studies that have illuminated the neural substrates of these important cognitive and affective processes.