The effects of objectives and constraints on motor control strategy in reciprocal aiming movements

The goal of this study was to examine how the kinematics of reciprocal aiming movements were affected by both the objective of the movement and the constraints operating on that movement. In Experiment 1, the objective of the movement was indirectly manipulated by capitalizing on the fact that subjects determine their own accuracy and speed limits, despite uniform task instructions to move as quickly and accurately as possible. A Fitts' type reciprocal aiming paradigm was employed, in which 69 subjects were asked to move a stylus repetitively between two spatially separated targets. Four target widths were orthogonally combined with four movement amplitudes, resulting in 16 conditions. Movements were made on an X-Y digitizing tablet. Based on the mean variable error produced on both targets, subjects were differentiated post hoc into three movement objective groups: speed, accuracy, and speed-plus-accuracy. Kinematic analyses revealed that the programming and execution of movements were systematically influenced by both the movement objective and the movement constraints. That is, movement time, peak velocity, dwell time, acceleration and deceleration time, normalized acceleration and normalized deceleration varied systematically as a function of both the speed-accuracy movement objective and the movement constraints of target size and movement distance. Moreover, the consequences of changing the constraints of the movement were affected by an interaction with the objective of the movement. In Experiment 2, the objective of the movement was directly manipulated by varying speed and/or accuracy instructions to subjects. The basic results of Experiment 1 were substantiated. Overall, the results were consistent with the view that motor control is dependent upon sensory consequences.     

Student Voice for School‐Climate Improvement: A Case Study of an Urban Middle School

This case study used a student voice program in an urban middle school in the southeastern United States to examine the validity of three theoretically derived pathways through which student voice may affect positive school climate. First, using a youth participatory action research process to identify barriers to learning, analyse their root causes, and advocate for solutions to school administration allowed students to influence minor school policies and implement anti‐bullying, classroom‐behaviour‐monitoring, and experiential‐learning initiatives. However, there were challenges to making these policy and practice changes systemic. Second, relationships were formed and strengthened as a byproduct of student participant and staff collaboration in program activities. However, the program may have contributed to an ingroup–outgroup dynamic between participants and other peers. Third, students who participated in the program developed citizenship competencies, and their development may have promoted broader prosocial norms among the student body, though evidence was inconsistent. Study findings suggest that future research examine how variations in the implementation of student voice initiatives can maximize the contribution to a positive school climate in urban schools. Findings also suggest that practitioners should ensure that student teams be representative of a multitude of student identities. Copyright © 2014 John Wiley & Sons, Ltd.     

Causal Decision Theory and EPR correlations

The paper argues that on three out of eight possible hypotheses about the EPR experiment we can construct novel and realistic decision problems on which (a) Causal Decision Theory and Evidential Decision Theory conflict (b) Causal Decision Theory and the EPR statistics conflict. We infer that anyone who fully accepts any of these three hypotheses has strong reasons to reject Causal Decision Theory. Finally, we extend the original construction to show that anyone who gives any of the three hypotheses any non-zero credence has strong reasons to reject Causal Decision Theory. However, we concede that no version of the Many Worlds Interpretation (Vaidman, in Zalta, E.N. (ed.), Stanford Encyclopaedia of Philosophy 2014) gives rise to the conflicts that we point out.     

Positive and Negative Expectations of Hopelessness as Longitudinal Predictors of Depression,Suicidal Ideation,and Suicidal Behavior in High‐Risk Adolescents

The relationship between hopelessness and depression in predicting suicide‐related outcomes varies based on the anticipation of positive versus negative events. In this prospective study of adolescents at elevated risk for suicide, we used two Beck Hopelessness Scale subscales to assess the impact of positive and negative expectations in predicting depression, suicidal ideation, and suicidal behavior over a 2‐ to 4‐year period. In multivariate regressions controlling for depression, suicidal ideation, and negative‐expectation hopelessness, positive‐expectation hopelessness was the only significant predictor of depressive symptoms and suicidal behavior. Clinical interventions may benefit from bolstering positive expectations and building optimism.     

Conversation: The challenges of teaching in a “nano department”

A panel at the 2016 American Academy of Religion conference staged, taped, transcribed, and edited this conversation about the challenges and opportunities of teaching in a “nano department” – an undergraduate religion or religious studies department (or combined religion and philosophy department) with only one, two, or three faculty members. Two things quickly become evident: one is the impossibility of coverage of the full religious studies curriculum, and the other is the necessity for collaboration with other departments. Neither of these is unique to nano departments, but there exists an intimacy between students and faculty in small departments, a necessary freedom to rethink the place of the study of religion in the liberal arts curriculum, and a disruptive value in what can be critiqued and contributed from a marginalized position. Arguably, nano departments are the canaries in the academic coal mine, charting the future of the humanities that cannot be discerned from the vantage point of Research‐1 contexts.     

Extended Cognition and Propositional Memory

The philosophical case for extended cognition is often made with reference to ‘extended‐memory cases’ (e.g. Clark & Chalmers 1998); though, unfortunately, proponents of the hypothesis of extended cognition (HEC) as well as their adversaries have failed to appreciate the kinds of epistemological problems extended‐memory cases pose for mainstream thinking in the epistemology of memory. It is time to give these problems a closer look. Our plan is as follows: in §1, we argue that an epistemological theory remains compatible with HEC only if its epistemic assessments do not violate what we call ‘the epistemic parity principle’. In §2, we show how the constraint of respecting the epistemic parity principle stands in what appears to be a prima facie intractable tension with mainstream thinking about cases of propositional memory. We then outline and evaluate in §3 several lines of response.     

It's a great big universe: Astrobiology and future trends for an astrotheology

Despite the awe and wonder that discoveries related to astrobiology inspire, the sheer volume and diversity of new discoveries related to space science can become overwhelming without meaningful frames of reference by which to organize our understanding of these phenomena. I suggest that a critical feature of the future of “astrotheology” relates to how it serves as an organizing correlate to astrobiology and space research. Considering that the prefix astro‐ has an amplicative and abductive effect on the fields of study to which it is applied, I contend that astrotheology implies a creative and constructive shift in how we conceptualize meaningful human being for theology that parallels how astrobiology effects a creative and constructive shift in how we conceptualize living systems.     

Threat ≠ prevention,challenge ≠ promotion: The impact of threat,challenge and regulatory focus on attention to negative stimuli

The purpose of the current experiment was to distinguish between the impact of strategic and affective forms of gain- and loss-related motivational states on the attention to negative stimuli. On the basis of the counter-regulation principle and regulatory focus theory, we predicted that individuals would attend more to negative than to neutral stimuli in a prevention focus and when experiencing challenge, but not in a promotion focus and under threat. In one experiment (N = 88) promotion, prevention, threat, or challenge states were activated through a memory task, and a subsequent dot probe task was administered. As predicted, those in the prevention focus and challenge conditions had an attentional bias towards negative words, but those in promotion and threat conditions did not. These findings provide support for the idea that strategic mindsets (e.g., regulatory focus) and hot emotional states (e.g., threat vs. challenge) differently affect the processing of affective stimuli.     

Counting to ten milliseconds: low-anger, but not high-anger, individuals pause following negative evaluations

Low-anger individuals are less reactive, both emotionally and behaviourally, to a large variety of situational primes to anger and aggression. Why this is so, from an affective processing perspective, has been largely conjectural. Four studies (total N=270) sought to link individual differences in anger to tendencies exhibited in basic affective processing tasks. On the basis of motivational factors and considerations, it was hypothesised that negative evaluations would differentially activate a psychological alarm system at low levels of anger, resulting in a pause that should be evident in the speed of making subsequent evaluations. Just such a pattern was evident in all studies. By contrast, high-anger individuals did not pause following their negative evaluations. In relation to this affective processing tendency, at least, dramatically different effects were observed among low- versus high-anger individuals. Implications for the personality-processing literature, theories of trait anger, and fast-acting regulatory processes are discussed.     

Two facets of cognitive control in analogical mapping: The role of semantic interference resolution andgoal-driven structure selection

The study used scene analogies to investigate two component processes of analogical thinking: resolution of semantic interference, which emerges when the proper mapping between analogically matching objects is incoherent with their categorical features (e.g., stereotypical functions), and goal-driven selection of the key relational structure, by directing attention to the most promising objects which constitute that structure among many other candidate objects. We manipulated interference by placing in corresponding scenes the objects from one category in different relational roles. Selection was loaded by including additional, relationally irrelevant objects in a scene. We also manipulated relational complexity and the presence of salient objects (people) in relations. Increased load on both interference resolution and selection decreased the accuracy of analogical mapping, but these factors did not interact. Moreover, the factors yielded opposite patterns of interaction with relational complexity. Finally, salience eased selection, but tended to negatively influence interference resolution. In summary, inference resolution and selection seem to constitute two relatively independent facets of cognitive control involved in analogical thinking. Selection may act before mapping occurs, while interference influences analogy making only if an interfering object takes part in mapping.