Showing papers by "Michael S. Humphreys published in 1990"
TL;DR: The present study examined attentional processes in terms of four information-processing stages (feature extraction, identification, response selection, and motor adjustment) based on Sternberg's (1969) additive-factor method and found that both patients and normals exhibited a similar mode of linear information processing.
Abstract: The present study, based on Sternberg's (1969) additive-factor method, examined attentional processes in terms of four information-processing stages (feature extraction, identification, response selection, and motor adjustment). Four task variables were used to operationally define the stages (signal quality, signal similarity, signal-response compatibility, and foreperiod uncertainty). In two studies, a visuo-spatial reaction-time task was undertaken by a group of university subjects (Experiment 1) and by three groups of closed-head-injured patients (severe short-term, severe long-term, and mild short-term) and their corresponding matched controls (Experiment 2). The results indicated that both patients and normals exhibited a similar mode of linear information processing. In addition, it was found that the severe short-term group was impaired on the response-selection stage and response selection stage; the severe long-term group was impaired only on the response-selection; and no evidence of impairment was found for the mild short-term patients. The implications of these findings with reference to the study of attentional processes in closed-head injured patients and to neuropsychological assessment and rehabilitation are discussed.
61 citations
TL;DR: The results of three studies testing whether associative interference occurs in recognition as it does in recall are reported in this article, and the results of these studies are summarized in Table 1.
Abstract: The results of three studies testing whether associative interference occurs in recognition as it does in recall are reported.
47 citations
Proceedings Article•
01 Oct 1990TL;DR: This work presents an alternative process to search, based on calculating the intersection of sets of targets activated by two or more cues, which demonstrates the competence of both processes.
Abstract: For lack of alternative models, search and decision processes have provided the dominant paradigm for human memory access using two or more cues, despite evidence against search as an access process (Humphreys, Wiles & Bain, 1990). We present an alternative process to search, based on calculating the intersection of sets of targets activated by two or more cues. Two methods of computing the intersection are presented, one using information about the possible targets, the other constraining the cue-target strengths in the memory matrix. Analysis using orthogonal vectors to represent the cues and targets demonstrates the competence of both processes, and simulations using sparse distributed representations demonstrate the performance of the latter process for tasks involving 2 and 3 cues.
11 citations