Hebb learning, verbal short-term memory, and the acquisition of phonological forms in children

Recent work using the Hebb effect as a marker for implicit long-term acquisition of serial order has demonstrated a functional equivalence across verbal and visuospatial short-term memory. The current study extends this observation to a sample of five- to six-year-olds using verbal and spatial immediate serial recall and also correlates the magnitude of Hebb learning with explicit measures of word and nonword paired-associate learning. Comparable Hebb effects were observed in both domains, but only nonword learning was significantly related to the magnitude of Hebb learning. Nonword learning was also independently related to individuals' general level of verbal serial recall. This suggests that vocabulary acquisition depends on both a domain-specific short-term memory system and a domain-general process of learning through repetition.     

Testing boundary conditions for the conjunction fallacy: effects of response mode, conceptual focus, and problem type

Two experiments used within-subject designs to examine how conjunction errors depend on the use of (1) choice versus estimation tasks, (2) probability versus frequency language, and (3) conjunctions of two likely events versus conjunctions of likely and unlikely events. All problems included a three-option format verified to minimize misinterpretation of the base event. In both experiments, conjunction errors were reduced when likely events were conjoined. Conjunction errors were also reduced for estimations compared with choices, with this reduction greater for likely conjuncts, an interaction effect. Shifting conceptual focus from probabilities to frequencies did not affect conjunction error rates. Analyses of numerical estimates for a subset of the problems provided support for the use of three general models by participants for generating estimates. Strikingly, the order in which the two tasks were carried out did not affect the pattern of results, supporting the idea that the mode of responding strongly determines the mode of thinking about conjunctions and hence the occurrence of the conjunction fallacy. These findings were evaluated in terms of implications for rationality of human judgment and reasoning.     

Familiarity breeds distortion: the effects of media exposure on false reports concerning media coverage of the terrorist attacks in london on 7 July 2005

The present experiment investigated whether increased media exposure could lead to an increase in memory distortions regarding a traumatic public event: the explosion of the No. 30 bus in Tavistock Square, London on 7 July 2005. A total of 150 Swedish and 150 UK participants completed a series of questionnaires about their memory of either (i) the aftermath of the explosion, (ii) a non-existent computerised reconstruction of the moment of the explosion, or (iii) non-existent closed circuit television footage of the moment of the explosion. In line with the availability heuristic, U.K. participants were more likely than Swedish participants to claim to have seen all three types of footage. Furthermore, a subsample of U.K. participants who appeared to have developed false "memories" of seeing the No. 30 bus explode scored significantly higher on measures of dissociation and fantasy proneness than participants who did not develop false "memories". This experiment provides further support for the role of imaginative processes in the development of false memories.     

Methylphenidate amplifies long-term plasticity in the hippocampus via noradrenergic mechanisms

Methylphenidate treatment is used for Attention Deficit Hyperactivity Disorder and can improve learning and memory. Previously, improvements were considered a by-product of increased attention; however, we hypothesize that methylphenidate directly alters mechanisms underlying learning and memory, and therefore examined its effects on hippocampal long-term potentiation and long-term depression. Methylphenidate enhanced both mechanisms in the absence of presynaptic changes and in a noradrenalin beta-receptor-dependent manner. These findings can explain both the improved learning and memory and decreased learning selectivity found with methylphenidate treatment and constitute the first demonstration of direct actions of methylphenidate on mechanisms implicated in cognition.     

Loving-kindness meditation increases social connectedness

The need for social connection is a fundamental human motive, and it is increasingly clear that feeling socially connected confers mental and physical health benefits. However, in many cultures, societal changes are leading to growing social distrust and alienation. Can feelings of social connection and positivity toward others be increased? Is it possible to self-generate these feelings? In this study, the authors used a brief loving-kindness meditation exercise to examine whether social connection could be created toward strangers in a controlled laboratory context. Compared with a closely matched control task, even just a few minutes of loving-kindness meditation increased feelings of social connection and positivity toward novel individuals on both explicit and implicit levels. These results suggest that this easily implemented technique may help to increase positive social emotions and decrease social isolation.     

Description and First Steps Toward the Empirical Validation of the Plan Formulation Method for Couples

The aim of this paper is to empirically assess the reliability of the plan formulation method for couples, a procedure for formulating the case, planning, and monitoring the couple therapies according to control-mastery theory. We hypothesized that when couples are looking for couple therapy, they have an unconscious couple’s plan for the therapy, which includes the couple’s goals; the pathogenic beliefs that the partners want to disprove; the traumas from which these beliefs originated and that the partners want to master; the vicious relational circles that make the couple suffer and that the couple wants to break; the virtuous relational circles that are expressions of the couple’s resources and that the couple wants to fuel; and the relational insights that may help the couple get better. Our study involved 15 couples treated by four experienced therapists. Four raters independently formulated each couple’s plan based on the first three sessions following a standard procedure, and we calculated the intraclass correlation for pooled judges’ ratings. For a subsample of three couples—who before and after treatment had completed the dyadic adjustment scale (DAS) and the outcome questionnaire-45.2 (OQ-45.2)—the compatibility of the therapists’ interventions with the couples’ and partners’ plans was assessed. The relationship between the ratings of compatibility, DAS and OQ-45.2, was assessed. The results showed excellent interjudge reliability for each couple’s plan formulation (average ICC?=?0.82), attesting to the validity of the procedure; and preliminary data on the therapeutic process suggested that therapists’ interventions compatible with couple’s plans could help partners achieve good outcomes.

     

Infants perceive human point-light displays as solid forms

While five-month-old infants show orientation-specific sensitivity to changes in the motion and occlusion patterns of human point-light displays, it is not known whether infants are capable of binding a human representation to these displays. Furthermore, it has been suggested that infants do not encode the same physical properties for humans and material objects. To explore these issues we tested whether infants would selectively apply the principle of solidity to upright human displays. In the first experiment infants aged six and nine months were repeatedly shown a human point-light display walking across a computer screen up to 10 times or until habituated. Next, they were repeatedly shown the walking display passing behind an in-depth representation of a table, and finally they were shown the human display appearing to pass through the table top in violation of the solidity of the hidden human form. Both six- and nine-month-old infants showed significantly greater recovery of attention to this final phase. This suggests that infants are able to bind a solid vertical form to human motion. In two further control experiments we presented displays that contained similar patterns of motion but were not perceived by adults as human. Six- and nine-month-old infants did not show recovery of attention when a scrambled display or an inverted human display passed through the table. Thus, the binding of a solid human form to a display in only seems to occur for upright human motion. The paper considers the implications of these findings in relation to theories of infants' developing conceptions of objects, humans and animals.     

A prospective study of appraisals in childhood posttraumatic stress disorder

This study investigated the predictors of posttraumatic stress disorder (PTSD) in children following a diagnosis of traumatic injury. Children (N=76) aged between 7 and 13 who were admitted to hospital following injury were assessed within a month of trauma for acute stress disorder (ASD), negative appraisals, as well as parental stress reactions. Children (N=62) were re-assessed 6-months later for PTSD and negative appraisals. The majority of the variance of chronic posttraumatic stress was accounted for by negative appraisals about future harm. This study supports cognitive models of PTSD, and suggests that younger children who exaggerate their vulnerability after trauma exposure are high risk for PTSD after trauma.     

Experimental effects of rumination styles on salivary cortisol responses

Emerging research suggests that rumination increases risk for negative health outcomes. In the first experiment to investigate cortisol responses during angry rumination, participants were provoked and induced to engage in self-focused rumination, provocation-focused rumination, or distraction. Consistent with social threat theory, self-focused rumination maintained high levels of cortisol following provocation, whereas provocation-focused rumination and distraction facilitated decreases in cortisol. However, even within the provocation-focused rumination condition, adopting an emotionally reactive, self-immersed perspective was associated with higher levels of cortisol as were thoughts about the self. Individual differences in displaced aggression but not general aggression were also positively associated with cortisol levels in the provocation-focused condition. The present findings shed light on rumination styles and cortisol responses in ways that may have long-term consequences for health and well-being.

Developmental history of care and control,depression and anger: Correlates of maternal sensitivity in toddlerhood

This study examined maternal sensitivity in response to toddler distress in relation to mothers' childhood care and control experiences with parents, maternal depression, and maternal anger. Fifty‐two mothers and infants participated. Mothers reported childhood care and control experiences prenatally. At 2½ years, mothers reported depressive symptoms and anger on questionnaires, and reported maternal behavior in a daily diary for 1 week, yielding ratings of maternal sensitivity to fear and anger. Results were as follows: (a) Mothers' acceptance during childhood correlated negatively with both maternal depression and maternal anger, and positively with maternal sensitivity to fear at 2½ years; (b) maternal anger mediated the association between childhood care and maternal sensitivity to fear at 2½ years; and (c) the interaction of maternal and paternal control during childhood predicted maternal sensitivity to anger at 2½ years, controlling for maternal education. When maternal control was low, paternal control was positively associated with maternal sensitivity to anger whereas when maternal control was high, paternal control was negatively associated with maternal sensitivity to anger. Results are discussed in relation to prior studies, with particular emphasis on attachment theory. Implications for preventive intervention efforts are considered.