Similarity to the self influences cortical recruitment during impression formation

Prior work has shown that whether or not someone is similar to the self influences person memory—a type of self-reference effect for others. In this study, we were interested in understanding the neural regions supporting the generation of impressions and subsequent memory for targets who vary in similarity to the self. Participants underwent fMRI scanning while forming positive or negative impressions of face–behavior pairs. We tested participants’ memory for their generated impressions and then back-sorted the impression trials (encoding) into different levels of self-similarity (high, medium, low) using a self-similarity posttest that came after recognition. Extending prior behavioral work, our data confirmed our hypothesis that memory would be highest for self-similar others and lowest for self-dissimilar others. Dorsal anterior cingulate cortex (dACC) activity increased with self-similarity (high > medium > low) to targets, regardless of later memory for them. An analysis of regions supporting impression memory revealed a double dissociation within medial temporal lobe regions: for similar others, amygdala recruitment supported memory, whereas for dissimilar others, hippocampal activation supported memory. These results suggest that self-similarity influences evaluation and memory for targets but also affects the underlying neural resources engaged when thinking about others who vary in self-similarity.     

Motivational influences on cognitive control: Behavior,brain activation,and individual differences

What changes in brain activity are associated with changes in motivational state? The present study addressed this question by having participants perform a cognitive task (AX variant of the Continuous Performance Test; AX-CPT) under three different blocked motivational conditions (reward-incentive, penalty-incentive, and baseline). Behavioral data showed that the incentive conditions modulated task performance, potentially by altering participants’ cognitive control strategy. Neuroimaging data indicated that the reward condition was associated with a sustained increase in a primarily right-lateralized network that included parietal and prefrontal cortex. Additionally, individual differences were observed, such that activation in both reward-related brain regions and frontopolar cortex was linked to the degree of motivation-induced performance enhancement and to motivation-related personality variables. These results suggest that changes in motivational state may modulate performance through sustained activity in cognitive control regions and that the effect of incentives may be affected by the personalities of the participants.     

Unpacking outcome dependency: Differentiating effects of dependency and outcome desirability on the processing of goal-relevant information

Outcome dependency has been shown to have a substantial impact on impression formation. Perhaps because the outcome dependency variable is a composite variable (including variation in amount of dependency, desirability of outcome, or both), many different effects have been described by researchers. The current research unpacks the outcome dependency variable by separately examining effects of dependency (when outcome desirability is held constant) and effects of outcome desirability (when amount of dependency is held constant). Using research methods adapted from those used in the attitudes domain, variation in the amount of dependency on a target person influenced the level of objective processing of target information (when outcomes were not substantial, Experiment 1), but variation in the desirability of the outcomes influenced biases in the processing of information (when dependency was relatively high, Experiment 2). Furthermore, personal motivation mediated effects of desirable outcomes on positive biases in processing (Experiment 3).     

Sleep deprivation influences some but not all processes of supervisory attention

Does one night of sleep deprivation alter processes of supervisory attention in general or only a specific subset of such processes? Twenty college-aged volunteers, half female, performed a choice reaction time task. A cue indicated that compatible (e.g., right button, right-pointing arrow) or incompatible (e.g., left button, right-pointing arrow) responses were to be given to a stimulus that followed 50 or 500 ms later. The paradigm assessed response inhibition, task-shifting skill, and task strategy-processes inherent in supervisory attention. Performance, along with heart rate, was assessed for 12 hr following normal sleep or a night of complete sleep deprivation. Sleep deprivation altered neither preparation for task shifting nor response inhibition. The ability to use preparatory bias to speed performance did decrease with sleep deprivation. Sleep deprivation appears to selectively affect this supervisory attention process, which is perceived as an active effort to cope with a challenging task.     

Motivational influences on performance maintained by food reinforcement

In Study 1, we examined the independent effects of reinforcer consumption during sessions and meal consumption prior to sessions on performance maintained by food reinforcement. Nine individuals with developmental disabilities participated. On alternate days, a preferred edible item was delivered during (a) seven sessions conducted before lunch (repeated-reinforcement condition) versus (b) one session each conducted before and after lunch (pre- and postmeal conditions). Results for 7 of 9 participants showed decreased response rates across sessions in the repeated-reinforcement condition; results for 3 of 9 participants showed decreased rates during postmeal relative to premeal conditions. Two participants who did not show a decrement in responding during either comparison participated in Study 2, in which reinforcer consumption during sessions, combined with meal consumption prior to sessions, also had no effect on their performance. In Study 3, we determined whether (a) choice of reinforcers, (b) increased break time between sessions, (c) varied reinforcers, or (d) intermittent reinforcement schedules mitigated the satiation effects observed for the 7 participants in Study 1. Presession choice of reinforcers resulted in maintained performance for 2 of 6 participants exposed to this condition. Varied reinforcement resulted in maintained performance for only 1 of 5 participants exposed to this condition. Neither the increased break between sessions nor the intermittent reinforcement schedule was effective in maintaining performance for the participants who were exposed to these conditions.     

Motivational influences on controlled processing: moderating distractibility in older adults

Research has suggested that aging is associated with a decline in the efficiency of controlling processing operations. Three studies examined the moderating impact of personal relevance on age differences in one index of such operations: the ability to ignore distracting information. Young (17-26) and older (58-86) adults read a series of passages interspersed with irrelevant, distracting information, with the relevance of the passage content to these two age groups being systematically varied. For both groups, processing was more efficient and comprehension enhanced when passage relevance was high. These effects were particularly strong among older adults, a finding consistent with a growing body of data highlighting the importance of motivational factors in determining age differences in cognitive performance.     

Emotional influences on evaluative judgments: Roles of arousal,attention, and spreading activation

A conceptual framework and experimental technique for investigating the influence of phasic emotional states on information processing are described. The theoretical framework utilizes the constructs of arousal, attention, and spreading activation to characterize the potential nature of emotional effects. The experimental technique employs a game format within which simple emotional states are elicited by incentive warning signals and feedback signals occurring within each trial. Subjects judged the emotional tone of a target word presented following the warning signal, and reaction times and error rates were measured. Two experiments demonstrated an effect related to general arousal; responses were faster and less accurate following valuable as compared to neutral warnings. In addition, both studies found several more selective effects. A congruent incentive influence was evident in the more efficient processing of positive words following positive incentives and negative words following negative incentives. An incongruent outcome influence was evident in the more efficient processing of positive words following trials involving negative feedback. Analyses of processing benefits and costs indicated that these selective influences arose from attentional rather than spreading activation mechanisms. Control conditions demonstrated that neither effect was influenced by cognitive variables involving the symbolic form of the warning, the location of the warning, or the location of positive responses. Instead, the two effects depended primarily on the presence of a valuable as compared to neutral incentive signal. These results are discussed in light of contemporary model of interactions between emotion and cognition.These studies were conducted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the University of Oregon. I would like to thank my committee members S. W. Keele, M. I. Posner, and M. K. Rothbart, and also Marjorie A. Reed, for their many helpful suggestions.     

Influence of profession on impression formation: Polarization and contrast

In the present study it was investigated how information about the profession affects the judgment of a person characterized by traits. Two main effects in judgments of likeability were found. More responsible professions produce a lower overall mean of judgments (contrast effect) and more polarized judgments than less responsible professions do. Additionally, an interaction of these effects with the scale value of the traits could be found. For higher scale values a striking difference between the polarization scores for more and less responsible professions was obtained, whereas for lower scale values this difference was small. To obtain more insight into the process underlying the influence of profession response probabilities were analysed using psychometric functions. Two mechanisms seem to mediate this influence: Firstly, the acceptability of the person to be judged is integrated as a peripheral dimension together with the likeability as a focal dimension into a decision continuum. Secondly, a neutral point of the function representing the relation between acceptability and likeability is integrated into an internal standard the value of the decision continuum is to be compared with. The analogy of findings in attitude research is discussed.     

Interpersonal distance and impression formation

Impression formation was examined as a function of interpersonal physical distance in an interview. It was predicted that a confederate would be rated less socially active as the distance between him and the subject increased. The hypothesis was supported by a significant negative linear trend in the composite ratings of friendliness, aggressiveness, extraversion, and dominance A variation in this trend, indicating that confederates seated closest to the subject were seen as less socially active, was explained in terms of compensatory behaviors minimizing the effect of close physical proximity     

Self-actualization and impression formation1

Self-actualization (SA), assessed by scores on the Personal Orientation Inventory, was related to interpersonal behavior in two person perception experiments. SA moderated both personality impression ratings of stimulus persons presented singly and person preference choices in a paired comparisons paradigm. In general, self-actualized individuals were found to be more extreme in their responses to social stimuli than were non-self-actualized individuals. Results were discussed in terms of previous attempts to assess the relationship between SA and cognitive processing.     

Prejudice and stereotype maintenance processes: attention, attribution, and individuation

Three experiments examined the relationship between prejudice and processing of stereotypic information. Higher levels of prejudice were associated with greater attention to and more thorough encoding of stereotype-inconsistent than stereotype-consistent behaviors but only when processing capacity was plentiful (Experiments 1 and 3). High-prejudice participants attributed consistent behaviors to internal factors and inconsistent behaviors to external forces (Experiment 2). Together, these results suggest that high-prejudice people attend carefully to inconsistent behaviors to explain them away but only if they have sufficient resources to do so. Results also showed that low-prejudice but not high-prejudice participants formed individuated impressions by integrating the implications of the target's behaviors (i.e., individuating). High levels of prejudice appear to be associated with biased encoding and judgment processes that may serve to maintain stereotypes.     

Client gender and sex-typed nonverbal behavior: Impact on impression formation

The influence of sex-typed nonverbal behavior of male and female clients on college students' perceptions was investigated. In a 2 × 2 × 2 factorial design, 156 male and female college students were exposed to a videotaped interview during which either a male or female client displayed either masculine or feminine sex-typed nonverbal behaviors. Subjects rated the perceived characteristics, prognosis for improvement, and problems of the client. Hypothesized main effects for client gender and sex-typed nonverbal behavior did not obtain. However, the hypothesized client gender by sex-typed nonverbal behavior interaction was found. This result was due primarily to a pervasive tendency to stigmatize the female clients displaying masculine sex-typed behaviors, in comparison to male clients displaying these same behaviors. Possible explanations and implications for these observed effects were discussed.     

Motivational processes and behavioral inhibition in breath holding

Large individual differences in breathing performance have made it difficult to investigate the effects of psychological variables on respiratory parameters. This study uses an experimental approach to investigating the effects of attentional and motivational factors on breath-holding span in humans. The effects of shock threat (negative incentive), monetary reward (positive incentive), and mantra meditation (attentional control) on breath-holding span at functional residual capacity (FRC) were compared. Based on Jeffrey Gray's (1975, 1987) theory of behavioral inhibition, it was predicted that shock threat would extend FRC breath holding. Breath holding was increased under the shock threat condition but not under the monetary reward or mantra meditation conditions.     

Motivational influences on compliance with and consequences of instructions to suppress stereotypes

Two experiments investigated differences in compliance with instructions to suppress stereotypes as a function of prejudice-related motivations. In Experiment 1, only participants identified as high in motivation to control prejudice [Dunton, B. C., & Fazio, R. H. (1997). An individual difference measure of motivation to control prejudiced reactions. Personality and Social Psychology Bulletin, 23, 316-326] complied with suppression instructions. These participants experienced post-suppression rebound effects, but only if they were also high in prejudice. In Experiment 2, only participants identified as high in external motivation to respond without prejudice [Plant, E. A., & Devine, P. G. (1998). Internal and external motivation to respond without prejudice. Journal of Personality and Social Psychology, 75, 811-832] complied with instructions to suppress. These participants later experienced stereotype rebound effects, but only if they were also low in internal motivation to respond without prejudice. These findings suggest that motivational factors play an important role in determining not only the outcome of suppression, but also the choice to attempt suppression in the first place.     

Aging, selective attention, and inhibitory processes: a psychophysiological approach.

The present study investigated the efficiency with which younger and older adults allocate attention to relevant and irrelevant stimuli. The model of attention guiding this research links the orienting response with the allocation of attention and habituation with the inhibition of the allocation of attention. We adapted a paradigm developed by Iacono and Lykken (1983) in which subjects are instructed unambiguously either to attend to or to ignore a series of innocuous tones, and the skin conductance orienting response elicited by each tone is measured. Results revealed that young subjects instructed to ignore the tones habituated more quickly than did those instructed to attend to the tones. However, older adults exhibited nondifferential orienting across the 2 instruction conditions. These results suggest an age-related deficit in the ability to inhibit attention to irrelevant stimuli.     

Contextual influences on acculturation processes: The roles of family,community and society

The paper outlines the major approaches to the psychological study of acculturation, drawing particular attention to the importance of context. Three significant contexts are highlighted: family, ethnic community, and society/nation. New perspectives from our evolving program of acculturation research are introduced to illustrate contextual influences on acculturation, and future directions for empirical work are recommended.