My research is aimed at understanding brain-behavior relationships in humans, at systems level. Two main approaches are used:

1. the lesion method, in which brain-damaged patients are studied with neuropsychological procedures to determine how certain lesion sites are related to certain cognitive and behavioral deficits
2. functional imaging, including PET and fMRI, in which the brain activation in normal subjects is measured while the subjects are performing various tasks.

Specific topics that I am working on currently include: retrieval of conceptual knowledge; retrieval of words and lexical knowledge; emotion and decision-making; face processing; nonconscious processing; acquired disorders of social conduct; memory; psychophysiology. My research has been continuously and fully funded for two decades. I have about a thousand square feet of laboratory space in the Department of Neurology in the University of Iowa Hospitals.

Recent publications