Hemodynamic and electrophysiological study of the role of the anterior cingulate in target-related processing and selection for action

A number of experiments requiring attention or other complex cognitive func tions have found substantial activation in the anterior cingulate cortex (A CC). Some of these studies have suggested that this area may be involved in "selection for action," such as for selecting to respond to a target stimu lus. Here, positron emission tomography (PET) and event-related potentials (ERPs) were used to study the effects of target probability during a demand ing visual spatial attention task, in which the target percentage was eithe r low (2%, 1 per similar to 26 sec) or high (16%, 1 per similar to 3.5 sec) . As expected, ERPs to detected targets evoked large, bilaterally distribut ed P300 waves. The PET showed strong activation of the ACC, particularly do rsally, during all the attend conditions relative to passive. However, thes e PET activations did not significantly differ between the few-target and m any-target conditions, showing only a small trend to be larger in the many- target case. Such results indicate that the hulk of the ACC activation does not reflect selection for action per se, while also suggesting that the AC C is not a likely source of the P300 effect. The current data, however, do not argue against the ACC serving a role in maintaining a vigilant or antic ipatory state in which one may need to select for action, or in continually or repeatedly (i.e., for each stimulus) needing to resolve whether to sele ct to act or to not act. (C) 1999 Wiley-Liss, Inc.