Overcoming suppression in order to remember: Contributions from anterior cingulate and ventrolateral prefrontal cortex

The ability to remember is often compromised by competition from irrelevant memories. However, acts of selective remembering can alter the competitive relationship between memories; memories that are selected against are weakened, whereas those that are retrieved are strengthened. Whereas the weakening of selectedagainst memories is typically evidenced by subsequently poorer recall of these memories, the present study tested the hypothesis that when previously selected-against memories can subsequently be successfully retrieved, such acts of successful retrieval are associated with engagement of neurobiological mechanisms that serve to detect and overcome competition. Consistent with this hypothesis, fMRI revealed that anterior cingulate cortex and right ventrolateral prefrontal cortex are differentially engaged during successful retrieval of previously selected-against memories, and that their engagement is directly related to the magnitude of weakening that is induced by prior acts of selecting against these memories.     

Effect propensity

In a choice between two options, decision makers can often be roughly divided into three groups: those who strongly prefer the first option, those who strongly prefer the second option, and those whose choices are most sensitive to the specific conditions (Switchers). In any reference state, such as the experimental control, Switchers’ choices are unlikely to be exactly equally divided between the options, which potentially creates a ceiling effect among those most susceptible to influence by the particular conditions or experimental manipulations. The limited growth potential of the option favored by Switchers in the reference state can produce “effect propensity,” whereby any condition or manipulation applied to the reference state is more likely to increase the share of the other option. We test this proposition in a series of studies in the context of choices between safe and risky options and between lower-price/quality and higher-price/quality options. The results indicate that a large majority of conceptually unrelated manipulations tend to increase the choice share of risky and higher-price/quality options. This effect propensity can be reversed when the risky and higher-price/quality options are the status quo alternatives or asymmetrically dominating in the reference state. Alternative explanations for effect propensity are examined. We discuss the implications of effect propensity for the interpretation of research findings, the selection of controls, and theory tests.     

The effect of accountability on susceptibility to decision errors

Recent research indicates that accountability can influence both what and how people think and might reduce decision makers' susceptibility to a variety of common judgment and choice errors. It is proposed that accountability can reduce decision errors if (1) decision makers are able to anticipate which response will be evaluated as more rational, and without concerns about accountability decision makers tend to select a different response, or (2) the normatively correct response can be identified by the more thorough and complex information processing associated with accountability. Consistent with the first proposition, four experiments demonstrated that accountability can reduce the sunk cost effect. The findings suggest that this debiasing effect reflects the subjects' expectation that they would be evaluated more favorably if they ignored sunk costs. Contrary to the second proposition, the prediction that accountable decision makers, due to their more thorough and multidimensional processing, would exhibit more consistent preferences across preference elicitation procedures was not supported in two studies. Finally, as hypothesized, accountability did not reduce a variety of decision errors for which the correct response was not known and was unlikely to be identified with more thorough information processing. These results are consistent with the notion that accountability effects in decision making are driven by the desire to be favorably evaluated and avoid criticism by others.     

Congruence and consistency derived from the circular and the hierarchical models as predictors of Occupational Choice Satisfaction

Peiser and Meir (Journal of Vocational Behavior, 1978, 12, 270–278) tested the predictability of Occupational Choice Satisfaction (OCS) using Holland's constructs of congruence and consistency as applied to Roe's classification of occupations and the circular structure of vocational interests. In the present study congruence and consistency are applied to the same data, but the constructs are defined according to the hierarchical model for the structure of interests (I. Gati,Journal of Vocational Behavior, 1979, 15, 90–106). The hierarchical and the circular models are found to be of similar efficiency in predicting OCS by congruence and by consistency. Each model, however, has its unique and distinctive predictions, and thus they seem to complement each other rather than to compete.     

Testing models for the structure of vocational interests

Several studies aimed at testing the validity of Holland's hexagonal and Roe's circular models of interests showed results on which the null hypothesis of random arrangement can be rejected, and the investigators concluded that the tested models were supported. None of these studies, however, tested each model in its entirety. The present study is based on the assumption that the rejection of the null hypothesis of chance is not rigorous enough. Reanalysis of 13 data sets of published studies, using a more rigorous method, reveals that although the random null hypothesis can in fact be rejected in 11 data sets, the hexagonal-circular model was supported by only 2 data sets and was rejected by 11 data sets. The hierarchical model for the structure of vocational interests (I. Gati, Journal of Vocational Behavior, 1979, 15, 90–106) was submitted to an identical test and was supported by 6 out of 10 data sets, including 4 data sets that rejected the hexagonal-circular model. The predictions of each of the models which tend to be discontinued by empirical data were identified. The implications of the findings for the structure of interests and occupational choice are discussed.     

Recall of common and distinctive features of verbal and pictorial stimuli

Subjects first rated similarity of verbal and of pictorial stimuli. The same pairs of stimuli were presented again, without one common component and one distinctive component. Subjects were asked to recall the missing components and identify them as common or distinctive. The results show that components encoded as common are recalled relatively better than components encoded as distinctive, and the difference in recall is significantly greater in verbal than in pictorial stimuli.     

A hierarchical model for the structure of vocational interests

In this study a hierarchical model for the structure of vocational interests is proposed. Theoretical and methodological considerations, reanalysis of the C. E. Lunneborg and P. E. Lunneborg (Journal of Vocational Behavior, 1975, 7, 313–326) data, and an alternative interpretation of existing findings suggest that this model accounts for the interrelations among the vocational interest fields better than the hexagonal-circular models, or the four-factorial structure proposed by Lunneborg and Lunneborg (1975). The implications of this hierarchical model for vocational theory and some applications in vocational guidance are discussed.     

Parietal lobe contributions to episodic memory retrieval

Although the parietal lobe is not traditionally thought to support declarative memory, recent event-related fMRI studies of episodic retrieval have consistently revealed a range of memory-related influences on activation in lateral posterior parietal cortex (PPC) and precuneus extending into posterior cingulate and retrosplenial cortex. This article surveys the fMRI literature on PPC activation during remembering, a literature that complements earlier electroencephalography data. We consider these recent memory-related fMRI responses within the context of classical ideas about parietal function that emphasize space-based attention and motor intention. We conclude by proposing three hypotheses concerning how parietal cortex might contribute to memory.