In this paper, we describe our approach to the investigation of cholin
ergic modulation of human information processing. In a continuing seri
es of studies from our laboratories, we have systematically examined t
he extent to which current psychological models of information process
ing provide an adequate framework for the interpretation of the modula
tory effects of cholinergic agents on cognitive performance measures.
We suggest that the data are consistent with the view of attention and
memory as processes which operate through a common, limited capacity
executive mechanism, rather than separable serial processes described
in the traditional modular models of memory.