ABSTRACT
A temporally based scheme for investigation of changes in consciousness, applicable to areas such as meditation and hypnosis, is proposed and is divided into 3 basic epochs: before — predispositional variables that affect response to consciousness altering techniques; during —the state effects of the particular technique; and after —the trait effects of the practice. Research is surveyed which indicates the role of attentional processes during each of these 3 basic epochs in both meditation and hypnosis. Attentional flexibility is a predispositional variable affecting response to both meditation and hypnosis. The state effects of concentrative meditation involve alterations in stimulus set while the state effects of hypnosis may reflect primarily response set. The trait effects elicited by meditation depend critically on the psychobiological systems which are called into play. Evidence is discussed which suggests that concentrative meditation shares with relaxation an autonomic quiescence, but in addition enhances some attentional skills. A mindfulness technique involving the adoption of a particular attentional stance toward all objects of awareness appears to enhance cortical specificity, but a concentration technique does not. Some implications of attentional self-regulation are discussed.
