A comparison of dichotic and visuo-acoustic competition in hemispherectomized patients

Following hemispherectomy, patients performing dichotic listening tasks have great difficulty reporting items presented to the ear ipsilateral to their intact hemisphere. One possible cause is an attentional imbalance which, when competing inputs are received from both sides of space, restricts the patient's attention to the stimulus contralateral to his remaining hemisphere. If this explanation is true, then a similar ipsilateral ear decrement should occur when a competing visual stimulus is presented in the contralateral field. In the present study, however, hemispherectomy patients easily reported a digit presented to the ear ipsilateral to their intact hemisphere despite the concurrent presentation of a visual digit to their contralateral field.     

Goal distance in time and its effects on the relations between achievement motives and performance

Based on Miller's theoretical model, it is predicted that (1) pupils high in motive to approach success and low in motive to avoid failure (approach-oriented) would increase and (2) those with the opposite motive constellation (avoidance-oriented) would decrease their level of performance as a distant future goal approaches in time. These hypotheses were supported when number of problems solved correctly was used as measure of level of performance, while only Hypothesis 1 received support when number of problems attempted was employed. The hypothesis (3) that avoidance-oriented pupils would have a steeper slope of goal gradient for performance than the approach-oriented pupils, received no support.     

A parent-offspring adoption study of cognitive abilities in early childhood

Do cognitive abilities in early childhood relate genetically and/or environmentally to isomorphic abilities in adulthood? Are specific cognitive abilities diffentiated in early childhood in terms of their prediction of adult cognitive abilities? The present study, the first behavioral genetic analysis of specific cognitive abilities in early childhood, explored these questions using parent-offspring data for 186 adopted children and 151 nonadopted children tested in the longitudinal Colorado Adoption Project at 3 years of age and 162 adopted children and 138 nonadopted children tested at 4 years. The children's Stanford-Binet IQ and scores for four specific cognitive abilities (verbal, spatial, perceptual speed, and memory) were correlated with corresponding measures for their parents—the biological and adoptive parents of the adopted children and the natural parents of the nonadopted children. Significant correlations were found between biological mothers' IQ and the IQ of their adopted away offspring at 3 and 4 years of age, suggesting genetic influence for IQ. However, specific cognitive abilities yielded no significant correlations between biological mothers and their adopted-away offspring. These results suggest that substantial genetic continuity exists for IQ from early childhood to adulthood, but not for specific cognitive abilities.     

Influence of item identification on the memory performance of mentally retarded and nonretarded adults

The role of item identification in the memory performance of mentally retarded and nonretarded adults was examined by varying the identification and memory parameters of a sequential same-different task. In Study 1, retarded subjects' identification ability was demonstrated to be less efficient than nonretarded subjects' ability. In Study 2, target duration and interstimulus interval were varied. Memory performance differed between groups, and the memory deficit for retarded subjects was demonstrated to be independent of their identification deficit. The target durations in Study 2 were relatively brief, and in Study 3, the target duration was increased to insure that all subjects could identify the target. Mentally retarded subjects were demonstrated to have a memory deficit. The results were discussed in terms of possible sources of the memory deficit.     

Potential influence structures as sources of interpersonal conflict in groups and organizations

It is argued that conflict in organizations can be interpreted, in many cases, as conflict over who is to exert influence, and that this conflict, in turn, is caused by structural incongruencies in the distribution of potential influence in groups and organizations. Potential influence is described in terms of the structural relations defined by Structural Role Theory. At the psychological level, conflict is explained as a result of incompatible expectations among people about their relative influence, their desire to protect valued roles, and to maintain a sense of freedom. The implications of the present hypothesis for specifying the range of conflict situations, the type of conflict behavior, and conflict management are explored.     

Subjective utility,anticipated utility,and the Allais paradox

One of the most notable counterexamples to expected utility theory is the “Allais paradox” (M. Allais, 1953, Econometrica, 31, 503–546). A number of alternative theories have been proposed in an attempt to resolve this paradox, notably including Karmarkar, 1978, Karmarkar, 1979, 24, 67–72). It is shown that SWU theory necessarily involves violations of dominance, but that the theory can be modified to avoid these violations. The result is a special case of J. Quiggin's anticipated utility theory (1982, Journal of Economic Behaviour and Organisation, 3, 323–343).     

Why does self-reference promote incidental encoding?

Answering a question regarding a stimulus word can cause incidental encoding of the word itself. The thoroughness of the encoding depends in part upon what question is answered. For example, saying whether a word describes oneself causes a particularly high degree of incidental encoding. The study reported here investigated several variables that have been proposed as mediators of that effect. As in previous research, subjects completed an incidental-encoding and recall procedure. They then rated (a) the quality and degree of affect that they would experience if each stimulus word were to be applied to them, (b) the importance to them of the behavioral/psychological dimension implied by the stimulus word, and (c) the degree to which they saw themselves as distinctive on that dimension. As in previous studies, deciding whether a word described the self increased the likelihood of subsequent recall. There also was a highly significant interaction such that words judged to be applicable to self were recalled better than those judged not to be applicable. There was no evidence, however, of a mediational role for any other variable studied. Discussion centers on theoretical implications of the data.     

Tests of sphericity of normal distributions and the analysis of repeated measures designs

The locally best invariant test statistic for testing sphericity of normal distributions is shown to be a simple function of the Box/Geisser-Greenhouse degrees of freedom correction factor in a repeated measures design. Because of this relationship it provides a more intuitively appealing test of the necessary and sufficient conditions for valid F-tests in repeated measures analysis of variance than the likelihood ratio test. The properties of the two tests are compared and tables of the critical values of the Box/Geisser-Greenhouse correction factor are given.     

Temporal aspects of retrieval in short-term serial retention

In three experiments, temporal properties of memory retrieval are studied. Latency of positionally probed recall of a single item is measured as a function of its serial position (SP) in a serial list. The requested SP is indicated by a positional probe, presented immediately after the list. For two organizational structures of the list (i.e., grouped vs. ungrouped lists) the experiments study the effects of precueing the probe position briefly before probe presentation, the cue signal indicating the SPs relevant for recall. The problem of confounded effects on latency of requested SP and of probe-signal location is also investigated. A bow-shaped SP-curve is found for ungrouped lists; precueing reduces RT but does not affect the bowed shape. This argues against selective confounding effects of spatial probe position and also suggests that precueing preactivates memory access. Grouping the items into two sublists eliminates precueing effects for items around the group boundary. Furthermore, precueing is detrimental when SPs at opposite ends of the list are precued. This suggests that the available points of memory access can only be utilized one at a time, so that precueing is not beneficial when the item cannot be reached via the preactivated point. Although the notion of single access to memory is in accord with both positional cueing theory and non-associative hierarchical theories (e.g., Estes 1972), various details of the results are in favor of the first type of explanation.     

Occupational prestige: Exploration of a theoretical basis

Drawing on the theory and research of psychophysics, a nonlinear model is hypothesized to explain the connection between education and income and occupational prestige. To achieve this, Weber's (R. L. Gregory, 1981, Mind in Science, Cambridge, Cambridge Univ. Press, pp. 501–503) and Stevens' (S. S. Stevens, 1970, Science170, 1043–1050) laws are brought together in an intrinsically nonlinear model. Guided by the earlier work of R. L. Hamblin (1971, Sociometry, 34, 423–452) and others, the work of O. D. Duncan (1961, in A. J. Reiss, Jr., O. D. Duncan, P. K. Hatt, & C. C. North (Eds.), Occupations and Social Status, New York, Free Press) is reanalyzed testing the possibility that work on the socioeconomic index can be understood as a prestige allocation process which follows psychophysical principles. That is, prestige is assigned to occupations, given specifiable levels of educational and income attainment, in a manner parallel to the way in which individuals respond to changes in the intensity of other stimuli. Using first the data developed by Duncan (1961) to test the model and the 1963 NORC data (R. W. Hodge, P. M. Siegel, & P. H. Rossi, 1964, American Journal of Sociology, 70, 286–302) to replicate it, a measurement model consistent with the theoretical model is evaluated. Comparing the results of the nonlinear model to that of the linear, it is concluded that a model is obtained yielding theoretical confirmation with no loss in predictive accuracy. The resultant nonlinear model yields alternative substantive implications concerning the relative influence of income and education on occupational prestige to those to be inferred from linear models. Perhaps most important, however, is the candidacy given by these results to psychophysics as the explanatory mechanism in the prestige allocation process.