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.     

The role of higher level adaptive coding mechanisms in the development of face recognition

Developmental improvements in face identity recognition ability are widely documented, but the source of children’s immaturity in face recognition remains unclear. Differences in the way in which children and adults visually represent faces might underlie immaturities in face recognition. Recent evidence of a face identity aftereffect (FIAE), in which adaptation (exposure) to a particular identity causes a previously neutral face to take on the computationally opposite identity, suggests that adults code faces in an opponent fashion relative to an average face. One previous study showed comparable FIAEs in 8-year-olds and adults but did not demonstrate that adaptation was selective for high-level representations in both groups. Using a developmentally appropriate FIAE task, we investigated whether children show adult-like adaptation for facial identity when adapting and test images differ in size. Both age groups showed an equivalent FIAE, suggesting that qualitative changes in the use of higher level adaptive coding mechanisms do not drive the developmental improvements in face recognition ability, at least from 8 years of age.     

Independent benefits of contact and friendship on attitudes toward homosexuals among authoritarians and highly identified heterosexuals

Although intergroup contact is generally associated with positive intergroup attitudes, little is known about whether individual differences moderate these relations, or how contact might operate among prejudice‐prone individuals. The present investigation explores Person × Contact and Person × Friendship interaction patterns among heterosexual university students. As expected, the positive relations of right‐wing authoritarianism (RWA) and heterosexual identification with prejudice against homosexuals were weakened when participants reported increased contact, more positive contact, direct (personal) friendships, or indirect friendships (i.e., ingroup friends with outgroup friends) with homosexuals. These patterns held after controlling statistically for each person or situation variable. Contact and friendship exerted smaller or negligible effects among low authoritarians or low identifiers. Tests of indirect effects revealed that among high authoritarians or high identifiers, contact and friendship exerted influence on attitudes through group‐level perceptions that homosexuals promote societal values and through increased self–other overlap with gay friends, each otherwise resisted by these individuals. Overall these results suggest that: (a) intergroup contact and intergroup friendship are related but distinct constructs; and (b) past findings underestimate contact effects by collapsing across levels of personal biases. Copyright © 2008 John Wiley & Sons, Ltd.     

Plasma BDNF is reduced among middle-aged and elderly women with impaired insulin function: Evidence of a compensatory mechanism

Brain-derived neurotrophic factor (BDNF) plays a regulatory role in neuronal differentiation and synaptic plasticity and has been linked to glucose regulation and cognition. Associations among plasma BDNF, cognition, and insulin function were explored. Forty-one participants with impaired insulin function (IIF), ranging from insulin resistance to type 2 diabetes mellitus (T2DM), were matched with 41 healthy controls on gender, age, education, and IQ. Participants received complete medical, neurological, psychiatric, and neuropsychological evaluations. IIF individuals had significantly lower plasma BDNF levels than controls, particularly females, and higher BDNF levels were associated with poorer explicit memory in IIF females, suggesting that higher levels within this group may reflect the body’s efforts to respond to damage. After accounting for age, education, and HbA1c, BDNF significantly predicted 13.1–23.5% of the variance in explicit memory in IIF women. These findings suggest that BDNF elevations within diseased groups may not always be a marker of health.     

Knowledge about a common source can promote visual- haptic integration

The brain integrates object information from multiple sensory systems to form a unique representation of our environment. Temporal synchrony and spatial coincidence are important factors for multisensory integration, indicating that the multisensory signals come from a common source. Spatial separations can lead to a decline of visual-haptic integration (Gepshtein et al, 2005 Journal of Vision 5 1013-1023). Here we tested whether prior knowledge that two signals arise from the same object can promote integration even when the signals are spatially discrepant. In one condition, participants had direct view of the object they touched. In a second condition, mirrors were used to create a spatial separation between the seen and the felt object. Participants saw the mirror and their hand in the mirror exploring the object and thus knew that they were seeing and touching the same object. To determine the visual-haptic interaction we created a conflict between the seen and the felt shape using an optically distorting lens that made a rectangle look like a square. Participants judged the shape of the probe by selecting a comparison object matching in shape. We found a mutual biasing effect of shape information from vision and touch, independent of whether participants directly looked at the object they touched or whether the seen and the felt object information was spatially separated with the aid of a mirror. This finding suggests that prior knowledge about object identity can promote integration, even when information from vision and touch is provided at spatially discrepant locations.     

The interaction of pathways to fear in childhood anxiety: a preliminary study

Recent research has shown that the verbal information pathway to fear creates long-term fear cognitions and can create cognitive biases and avoidance in children. However, the interaction between the verbal information pathway to fear and other pathways is untested. This experiment exposed children (aged 6–8) to threat information about a novel animal to see the impact on a measure of avoidance after a subsequent simulated direct negative encounter with that animal. Results showed that a direct negative experience (without prior information) or threat information (without a subsequent negative experience) produced similar effects, but in combination (verbal threat information followed by a direct negative experience) the effect was significantly magnified. These results support theories of fear acquisition that suppose that verbal information impacts on the strength of associations formed in subsequent conditioning episodes, and suggest that pathways to fear have interactive effects.     

Workplace emotions: the role of supervision and leadership

In this experience sampling study, the authors examined the role of organizational leaders in employees' emotional experiences. Data were collected from health care workers 4 times a day for 2 weeks. Results indicate supervisors were associated with employee emotions in 3 ways: (a) Employees experienced fewer positive emotions when interacting with their supervisors as compared with interactions with coworkers and customers; (b) employees with supervisors high on transformational leadership experienced more positive emotions throughout the workday, including interactions with coworkers and customers; and (c) employees who regulated their emotions experienced decreased job satisfaction and increased stress, but those with supervisors high on transformational leadership were less likely to experience decreased job satisfaction. The results also suggest that the effects of emotional regulation on stress are long lasting (up to 2 hr) and not easily reduced by leadership behaviors.     

Structural and Community Change Outcomes of the Connect‐to‐Protect Coalitions: Trials and Triumphs Securing Adolescent Access to HIV Prevention,Testing, and Medical Care

Connect to Protect (C2P), a 10‐year community mobilization effort, pursued the dual aims of creating communities competent to address youth's HIV‐related risks and removing structural barriers to youth health. We used Community Coalition Action Theory (CCAT) to examine the perceived contributions and accomplishments of 14 C2P coalitions. We interviewed 318 key informants, including youth and community leaders, to identify the features of coalitions’ context and operation that facilitated and undermined their ability to achieve structural change and build communities’ capability to manage their local adolescent HIV epidemic effectively. We coded the interviews using an a priori coding scheme informed by CCAT and scholarship on AIDS‐competent communities. We found community mobilization efforts like C2P can contribute to addressing the structural factors that promote HIV‐risk among youth and to community development. We describe how coalition leadership, collaborative synergy, capacity building, and local community context influence coalitions’ ability to successfully implement HIV‐related structural change, demonstrating empirical support for many of CCAT's propositions. We discuss implications for how community mobilization efforts might succeed in laying the foundation for an AIDS‐competent community.