The role of transmission biases in the cultural diffusion of irrelevant actions

This study used a diffusion chain paradigm to explore the cultural transmission of causally irrelevant tool actions in chains of adult participants. Each chain witnessed an "expert" adult retrieve a reward from inside a puzzle box using a combination of causally relevant actions and causally irrelevant actions. Which of the actions were causally relevant was evident in two of the chains where a transparent box was used. In the other two chains, the causal effectiveness of the tool was hidden inside an opaque version of the box. Results indicated that fewer of the irrelevant actions performed by the expert model were reproduced in the transparent box chains, than the opaque box chains. However, irrelevant actions, although not in their original form, were evident within each chain suggesting that causally irrelevant tool actions can survive within groups of adults. The current article places these results, alongside those from earlier overimitation studies, within a framework of cultural evolution. The proposal here is that the social learning of irrelevant actions is heavily influenced by the interaction between various transmission biases, including frequency-based biases, model-based biases, and content-based biases. It is further proposed that the transmission bias witnessed may differ according to the interplay between characteristics of the model, characteristics of the observer, and the contents of the task.     

Objects, events and "to be" verbs in Spanish--an ERP study of the syntax-semantics interface

In Spanish, objects and events at subject position constrain the selection of different forms of the auxiliary verb “to be”: locative predicates about objects require “estar en”, while those relating to events require “ser en”, both translatable as “to be in”. Subjective ratings showed that while the “object + ser + en” is considered as incorrect, the “event + estar + en” combination is also perceived as unacceptable but to a lesser degree. In an ERP study, we evaluated the impact of a purely semantic distinction (object versus events) on the subsequent processing of these auxiliary verbs followed by locatives in Spanish. For the “ser en” predicate, the P600 component was larger when the subject was an object than when it was an event. This P600 effect is consistent with an online repair of the defining predicate when it does not fit with the adequate semantic properties of the subject. On the other hand, for the “estar en” predicate, event subjects when compared to object subjects showed more positive ongoing amplitudes between 280 and 380 ms after the presentation of the “en” preposition, followed by a longer positive wave starting around 400 ms and lasting until 700 ms after the presentation of the following determiner, with central and frontal scalp distributions respectively. Thus, the different subject-predicate combinations, depending on the semantic features of the subjects, triggered syntactic reparatory processes at a structural level. These findings are consistent with an incremental interpretation of sentence meaning based on the interaction between syntactic and semantic information.     

Bodily self and schizophrenia: The loss of implicit self-body knowledge

Schizophrenia spectrum has been associated with a disruption of the basic sense of self, which pertains, among others, the representation of one's own body. We investigated the impact of either implicit or explicit access to the representation of one's own body-effectors on bodily self-awareness, in first-episode schizophrenia (FES) patients and healthy controls (HCs). We contrasted their performance in an implicit self-recognition task (visual matching) and in an explicit self/other discrimination task. Both tasks employed participant's own and others' body-effectors. Concerning the implicit task, HCs were more accurate with their own than with others' body-effectors, whereas patients did not show such self-advantage. Regarding the explicit task, both groups did not exhibit a self-advantage, and patients showed a higher percentage of self-misattribution errors. Neither self/other nor implicit/explicit effects were found in both groups when processing inanimate-objects. We propose that FES patients suffer of a disturbed implicit sense of bodily self.     

Character Strengths Interventions: Building on What We Know for Improved Outcomes

For this review strengths intervention studies were located using online searches and collegial networks and included if they explicitly sought to teach or use a strengths classification to enhance well-being, and used pre- and post-intervention measures and a comparison group. Eight studies met the criteria and have been summarised by this review. To date, the effect sizes achieved by character strengths interventions have been small to moderate. An understanding of how these interventions work may facilitate development of more effective interventions, while expanding the field of character strengths interventions to include a broader range of activities and approaches may also offer benefits. Research examining individual factors, such as strengths use, psychological need satisfaction, goal-setting and goal-striving provides promising leads to explain how strengths interventions work. However, the effect on intervention efficacy of relational or contextual factors, such as intervention environment or facilitator attitude to strengths, has not yet been explored. Implications for interventions in school settings are considered.     

Impairment in material-specific long-term memory following unilateral mediodorsal thalamic damage and presumed partial disconnection of the mammillo-thalamic tract

Neuropsychological findings suggest material-specific lateralization of the medial temporal lobe's role in long-term memory, with greater left-sided involvement in verbal memory, and greater right-sided involvement in visual memory. Whether material-specific lateralization of long-term memory also extends to the anteromedial thalamus remains uncertain. We report two patients with unilateral right (OG) and left (SM) mediodorsal thalamic pathology plus probable correspondingly lateralized damage of the mammillo-thalamic tract. The lesions were mapped using high-resolution structural magnetic resonance imaging and schematically reconstructed. Mean absolute volume estimates for the mammillary bodies, hippocampus, perirhinal cortex, and ventricles are also presented. Estimates of visual and verbal recall and item recognition memory were obtained using the Doors and People, the Rey Complex Figure Test, and the Logical Memory subtests of the Wechsler Memory Scales. Each patient's performance was compared to a group of healthy volunteers matched for demographic characteristics, premorbid IQ, and current levels of functioning. A striking double dissociation was evident in material-specific long-term memory, with OG showing significant impairments in visual memory but not verbal memory, and SM showing the opposite profile of preserved visual memory and significantly impaired verbal memory. These impairments affected both recall and item recognition. The reported double dissociation provides the strongest evidence yet that material-specific lateralization of long-term memory also extends to the anteromedial thalamus. The findings are also discussed in relation to proposals that distinct anatomical regions within the medial temporal lobe, anteromedial thalamus, and associated tracts make qualitatively different contributions to recall and item recognition.     

The Relationship between Mindfulness and Subjective Well-Being: Examining the Indirect Effects of Self-Connection and Meaning in Life

Over the past decade, support for the relationship between mindfulness and happiness has increased dramatically. The consensus is that people who are mindful also experience greater happiness. However, little is still known about how and why greater mindfulness leads one to be happier. The current research calls on recent theorizing to help understand the process by which this occurs. In particular, we studied the indirect effects of both self-connection and meaning in life on the relationship between mindfulness and subjective well-being. To this end, we compiled data collected in our lab over the past 3 years. A total of 2,929 participants provided cross-sectional data while 465 participated in longitudinal studies. Across both samples, the data supported our proposed model. Self-connection and meaning in life combined to mediate the relationship between mindfulness and the various aspects of subjective well-being. In all, it is clear that, although mindfulness is important, self-connection and meaning in life play key roles in one’s subjective well-being. This suggests that more research and interventions should focus on ways to increase self-connection and meaning in life as ways to help people experience greater happiness.

     

A test of motor skill-specific action embodiment in ice-hockey players

To further our understanding of the role of the motor system in comprehending action-related sentences, we compared action experts (athletes) to visual experts (fans) and novices when responding with an action-specific effector (either hand or foot). These conditions allowed inferences about the degree and specificity of embodiment in language comprehension. Ice hockey players, fans and novices made speeded judgments regarding the congruence between an auditorily presented sentence and a subsequently presented picture. Picture stimuli consisted of either hockey or everyday items. Half of these pictures ‘matched’ the action implied in the preceding sentence. Further, the action in these images involved either primarily the hand or the foot. For everyday items, action-matched items were responded to faster than action-mismatched items. However, only the players and fans showed the action-match effect for hockey items. There were no consistent effector-stimuli compatibility effects, nor skill-based interactions with compatibility, suggesting that the action-match effect was not based on motor ability per se, but rather a construction of the action based on knowledge or visual experience with the hockey related sentences.     

Western scrub-jays allocate longer observation time to more valuable information

When humans mentally reconstruct past events and imagine future scenarios, their subjective experience of mentally time travelling is accompanied by the awareness of doing so. Despite recent popularity of studying episodic memory in animals, such phenomenological consciousness has been extremely difficult to demonstrate without agreed behavioural markers of consciousness in non-linguistic subjects. We presented western scrub-jays (Aphelocoma californica) with a task requiring them to allocate observing time between two peepholes to see food being hidden in either of two compartments, one where observing the hiding location was necessary to later relocate the food, and another where food could easily be found without watching. Jays first separately experienced these consequences of possessing information in each compartment and subsequently, once given a choice, made more looks and spent more time looking into the compartment where information was necessary than into the compartment where it was unnecessary. Thus, the jays can collect information to solve a future problem. Moreover, they can differentiate sources of information according to their potential value and modify behaviour to efficiently collect important, usable information. This is the first evidence of metacognition in a species that passes the behavioural criteria for both retrospective and prospective mental time travel.     

The broaden and build process: Positive affect,ratio of positive to negative affect and general self-efficacy

Previous research indicates that increases in positive affect enhance personal resources and bring about improvements in various realms of life. The present study examined the role of general self-efficacy as a mediator between increases in positive affect and change in work and relationship satisfaction and mental health. Participants randomly assigned to a three-week intervention intended to increase positive affect showed significantly greater change in positive affect, ratio of positive to negative affect, self-efficacy, work satisfaction and mental health than participants in a control condition. Changes in affect were associated with changes in self-efficacy, work satisfaction, relationship satisfaction and mental health. Changes in self-efficacy were associated with increases in work satisfaction and mental health. The findings incorporate the concept of general self-efficacy into the broaden and build model and provide information regarding the utility of ratio of positive to negative affect indices.