The relationship of current manual preference (phenotypic handedness) and family history of handedness (genotypic handedness) to memory for imageable stimuli was studied. The purpose of the study was to test the hypothesis that genotypic handedness was related to lessened cerebral lateralization of Paivio's (1969) dual memory systems. The structure of memory was not at issue, but the mediation of storage and retrieval in memory has been explained with reference to verbal or imaginal processes. Verbal mediation theories and supporting data were reviewed along with imaginal theories and supporting data for these latter theories. Paivio's (1969) dual coding and processing theory was considered a conceptual bridge between the competing positions.

Ninety undergraduate students who scored as high or low on the Snyder Self-monitoring Scale participated in an experiment designed to determine the joint effects of self-monitoring and controllable or uncontrollable outcomes upon subsequent performance on three short-term memory tests. High and low self-monitoring subjects were assigned to one of three conditions: (1) controllable feedback, in which subjects received response contingent positive, "correct," and negative, "incorrect," feedback on a word association task; (2) uncontrollable feedback, in which subjects were given noncontingent feedback (70% negative and 30% positive); and (3) no-treatment. Measures of attentional focus were included in order to examine the role of attentional processes in the obtained results. In addition, the joint effects of treatment and self-monitoring on subjects' attributions were investigated. As predicted, the performance of high selfmonitors was significantly impaired by uncontrollability (learned helplessness), while that of low self-monitors was facilitated by controllability (learned competence). Results were discussed as supporting the contention that high self-monitors rely heavily on knowledge of environmental contingencies in order to control their environment. When their typically effective strategy is unsuccessful, "helplessness" is induced. Low self-monitors, who are less concerned with exercising control over environmental events, evidence diminished attention to and utilization of external …