ABSTRACT
The broadest and most critical arena of investigation and contention with regard to these two matters has always been consciousness itself. Broadbent unveiled a theoretical structure that allowed collation of a substantial body of experimental literature and that was seminal in its influence on later developments. Hybrid models have been of limited current theoretical interest, probably due in part to the difficulty in testing them experimentally. As remarked earlier, the quite special case of seriality versus parallelism is difficult enough to discriminate experimentally. Among such hybrid models are those that represent processing as being serial part of the time and partially parallel within trials. There are many occasions in perceptual and memorial experiments where the information sufficient to make a correct response is embedded in only part of the total stimulus pattern presented to the subject. A finding of independence of total completion times, for instance, although perhaps more intuitively associated with parallel models, can be predicted by serial models.
