The role of the basal ganglia in learning and memory: insight from Parkinson's disease

It has long been known that memory is not a single process. Rather, there are different kinds of memory that are supported by distinct neural systems. This idea stemmed from early findings of dissociable patterns of memory impairments in patients with selective damage to different brain regions. These studies highlighted the role of the basal ganglia in non-declarative memory, such as procedural or habit learning, contrasting it with the known role of the medial temporal lobes in declarative memory. In recent years, major advances across multiple areas of neuroscience have revealed an important role for the basal ganglia in motivation and decision making. These findings have led to new discoveries about the role of the basal ganglia in learning and highlighted the essential role of dopamine in specific forms of learning. Here we review these recent advances with an emphasis on novel discoveries from studies of learning in patients with Parkinson's disease. We discuss how these findings promote the development of current theories away from accounts that emphasize the verbalizability of the contents of memory and towards a focus on the specific computations carried out by distinct brain regions. Finally, we discuss new challenges that arise in the face of accumulating evidence for dynamic and interconnected memory systems that jointly contribute to learning.     

Does culture influence what and how we think? Effects of priming individualism and collectivism

Do differences in individualism and collectivism influence values, self-concept content, relational assumptions, and cognitive style? On the one hand, the cross-national literature provides an impressively consistent picture of the predicted systematic differences; on the other hand, the nature of the evidence is inconclusive. Cross-national evidence is insufficient to argue for a causal process, and comparative data cannot specify if effects are due to both individualism and collectivism, only individualism, only collectivism, or other factors (including other aspects of culture). To address these issues, the authors conducted a meta-analysis of the individualism and collectivism priming literature, with follow-up moderator analyses. Effect sizes were moderate for relationality and cognition, small for self-concept and values, robust across priming methods and dependent variables, and consistent in direction and size with cross-national effects. Results lend support to a situated model of culture in which cross-national differences are not static but dynamically consistent due to the chronic and moment-to-moment salience of individualism and collectivism. Examination of the unique effects of individualism and collectivism versus other cultural factors (e.g., honor, power) awaits the availability of research that primes these factors.     

High Power,Low Power,and Equality: Culture Beyond Individualism and Collectivism

Models of culture are operationalized as individualism and collectivism and have not given sufficient attention to other organizing axes—especially how a society handles power, dependence, and equality. Shavitt, Lalwani, Zhang, and Torelli (2006) make a significant contribution by first reminding the field of power distance (Hofstede, 1980) and then moving beyond a single factor to highlight benefits of Triandis’ (1995) horizontal (valuing equality) individualism–collectivism and vertical (emphasizing hierarchy) individualism–collectivism model. But this approach makes it difficult to disentangle the effects of power and individualism or collectivism; priming procedures and experimental variations of power can counter this limitation. Moreover, current horizontal/vertical approaches do not distinguish between having and not having power, although social cognition research documented differential effects of high and low power on content of self‐concept, relationality, and cognition, which suggest previously neglected cultural differences.     

Unfair treatment and self-regulatory focus

Ample correlational evidence exists that perceived unfair treatment is negatively related to well-being, health, and goal striving but the underlying process is unclear. We hypothesized that effects are due in part to contextual priming of prevention focus and the negative consequences of chronic prevention-focused vigilance. Indeed, reasonable responses to unfair treatment—to avoid situations in which it occurs or if this is not possible, confront it head on—fit prevention self-regulatory focus response patterns. Results from three experiments support this notion. Priming stigmatized social category membership heightened students’ prevention (not promotion) focus (n = 117). Priming non-stigmatized social category membership (i.e., white) did not change prevention focus (n = 46). Priming prevention (not promotion) increased perceptions of unfair treatment (and aroused prevention-relevant fight or flight responses) in response to a negative ambiguous job situation among low and moderate income adults (n = 112).     

THE DEFENSIVE NATURE OF BENEFIT FINDING DURING ONGOING TERRORISM: AN EXAMINATION OF A NATIONAL SAMPLE OF ISRAELI JEWS

A study examining the effects of terrorism on a national sample of 1,136 Jewish adults was conducted in Israel via telephone surveys, during the Second Intifada. The relationship between reports of positive changes occurring subsequent to terrorism exposure (i.e., Benefit finding), posttraumatic stress disorder (PTSD) symptom severity, and negative outgroup attitudes toward Palestinian citizens of Israel (PCI) was examined. Benefit finding was related to greater PTSD symptom severity. Further, Benefit finding was related to greater threat perception of PCI and ethnic exclusionism of PCI. Findings were consistent with hypotheses derived from theories of outgroup bias and support the anxiety buffering role of social affiliation posited by terror management theory. This study suggests that benefit finding may be a defensive coping strategy when expressed under the conditions of ongoing terrorism and external threat.     

Identity‐based motivation: Implications for action‐readiness,procedural‐readiness,and consumer behavior

Choices are often identity-based but the linkage to identity is not necessarily explicit or obvious for a number of reasons. First, identities feel stable but are highly sensitive to situational cues. Second, identities include not only content but also readiness to act and to use procedures congruent with the identity. Third, identities can be subtly cued without conscious awareness. Fourth, what an accessible identity means is dynamically constructed in the particular context in which it is cued. Because identities carry action- and procedural-readiness, the outcome of an identity-based motivation process may be similar to or different from the choices an individual would have made in another setting. Moreover, once an identity is formed, action and procedural-readiness can be cued without conscious awareness or systematic processing, resulting in beneficial or iatrogenic outcomes.     

Effects of Case and Transitivity on Processing Dependencies: Evidence From Niuean

We investigate the processing of wh questions in Niuean, a VSO ergative–absolutive Polynesian language. We use visual‐world eye tracking to examine how preference for subject or object dependencies is affected (a) by case marking of the subject (ergative vs. absolutive) and object (absolutive vs. oblique), and (b) by the transitivity of the verb (whether the object is obligatory). We find that Niuean exhibits (a) an effect of case, whereby dependencies of arguments with absolutive case (whether subjects or objects) are preferred over dependencies of arguments with ergative or oblique case, and (b) an effect of transitivity, whereby dependencies of obligatory objects (i.e., of transitive verbs) are preferred over dependencies of optional objects (i.e., of intransitive verbs). These results constitute evidence against theories that appeal to a universal subject advantage, or to the linear distance between filler and gap. Instead, the effect of case is consistent with a frequency‐based account: Because absolutive case has a wider syntactic distribution than ergative or oblique, absolutive dependencies are easier to process. The effect of transitivity reflects sensitivity of the parser to whether or not an argument is obligatory. We propose that these two strategies could be unified if the parser prefers dependencies with arguments that are more likely to materialize.     

Relational Entitlement,Early Recollections of Parental Care,and Attachment Orientation

The present study examined whether inadequate parental care has a long-term impact on pathological relational entitlement in romantic relations, and whether this impact is mediated by insecure attachment style. Our cohort of 335 Israeli adults completed Sense of Relational Entitlement (SRE), Experience in Close Relationships (ECR), and Parental Bonding Instrument (PBI) questionnaires. The results generally supported our hypotheses. Avoidant attachment style fully and negatively mediated the link between maternal adequate care and SRE total entitlement. Anxious attachment style fully and negatively mediated the link between PBI paternal adequate care and SRE total entitlement. Women were found to report more relational entitlement. These results support the notion that pathological relational entitlement has its roots in recollections of early parental care and attachment experiences. The results of the study are discussed in the context of adult attachment and romantic relationships.     

Bad,Pathetic and Greedy Women: Expressions of Surrogate Motherhood Stigma in a Russian Online Forum

Gestational surrogacy, in which the surrogate mother is not biologically related to the child she is carrying, is the most common type of surrogacy today. Although technologically well-developed and legal in many countries, it is stigmatized socially because it provokes and even contradicts basic traditional concepts of family, motherhood, and gender roles. The present study examines the types and expressions of the surrogacy stigma in Russia, applying a dual-pathway stigma model to a qualitative content analysis of 15,602 posts on a Russian-language online forum for surrogate mothers. Our findings reveal that the women’s choice to become surrogate mothers initiated a social process in which these women experienced four types of stigma: Bad mothers, bad wives, pathetic losers, and greedy women. Surrogate mothers described the experience and internalization of stigma as threatening their social roles in the traditional family and financial realm alike. Our study places surrogacy stigma in the context of the post-Soviet financial and social climate as experienced and expressed by participants. Furthermore, understandings of the essence of perceived surrogacy stigma may help professionals develop a more nuanced and accurate approach for psychological and social care and may lead to increased accuracy in media, law, and political representation of members of this vulnerable group.

     

How do people solve the "weather prediction" task?: individual variability in strategies for probabilistic category learning

Probabilistic category learning is often assumed to be an incrementally learned cognitive skill, dependent on nondeclarative memory systems. One paradigm in particular, the weather prediction task, has been used in over half a dozen neuropsychological and neuroimaging studies to date. Because of the growing interest in using this task and others like it as behavioral tools for studying the cognitive neuroscience of cognitive skill learning, it becomes especially important to understand how subjects solve this kind of task and whether all subjects learn it in the same way. We present here new experimental and theoretical analyses of the weather prediction task that indicate that there are at least three different strategies that describe how subjects learn this task. (1) An optimal multi-cue strategy, in which they respond to each pattern on the basis of associations of all four cues with each outcome; (2) a one-cue strategy, in which they respond on the basis of presence or absence of a single cue, disregarding all other cues; or (3) a singleton strategy, in which they learn only about the four patterns that have only one cue present and all others absent. This variability in how subjects approach this task may have important implications for interpreting how different brain regions are involved in probabilistic category learning.