The equilibrium-point hypothesis is still doing fine

Within the present paper we provide the arguments that contradict Gottlieb's conclusions regarding the theoretical implications of kinematics of movements performed with unexpectedly changed inertial loads. First, the load associated changes in movement velocity presented by Gottlieb may be caused by apparent methodological differences, when compared to our earlier results. Moreover, the present data can be interpreted by the equilibrium-point hypothesis as well as by Gottlieb's hypothesis. Second, Gottlieb remains silent on findings related to the movement time and symmetry ratio that contradict predictions based on either torque control or Gottlieb's hypothesis. Therefore, we conclude that the data obtained on rapid movements performed with unexpected changes in inertial load support equilibrium-point hypothesis, rather that any of the torque control based models.     

Hope,optimism, and affect as predictors and consequences of expectancies: The potential moderating roles of perceived control and success

Hope and optimism may be differentially influential depending on the situational context. This study sought to (1) experimentally test whether hope and optimism differentially predict specific expectancies in controllable versus uncontrollable situations and (2) examine the relative impact of specific expectancies on affect when desired outcomes are (or are not) achieved. A 2 × 2 independent samples design was used to experimentally manipulate perceived control and situational outcome (i.e., success or failure). Online participants (N = 571) completed self-report measures of hope and optimism before being randomly assigned to one of four experimental conditions. Results showed that hope, but not optimism, predicted specific expectancies in the perceived control condition. Conversely, optimism, but not hope, predicted specific expectancies in the no perceived control condition. More optimistic specific expectancies of success predicted greater positive affect regardless of success or failure outcome.     

控制感与老年人生命意义：自我认同和政策支持的作用

本研究探讨了控制感、自我认同、对政策支持的感知等因素如何影响老年人的生命意义感。通过对300多名来自北京、香港和台北的老年人的调查,发现控制感和政策支持对老年人生命意义感的影响显着,二者不仅主效应显着,同时存在交互作用。进一步的分析还发现：政策支持在控制感与生命意义感的关系中起调节作用——高政策支持感增强了控制对生命意义感的正向作用;自我认同在控制感与生命意义感的关系中起部分中介作用。结果对积极应对老龄化问题与增进老年人身心健康有重要的理论和现实意义。     

Thinking about luck

Luck looms large in numerous different philosophical subfields. Unfortunately, work focused exclusively on the nature of luck is in short supply on the contemporary analytic scene. In his highly impressive recent book Epistemic Luck, Duncan Pritchard helps rectify this neglect by presenting a partial account of luck that he uses to illuminate various ways luck can figure in cognition. In this paper, I critically evaluate both Pritchard’s account of luck and another account to which Pritchard’s discussion draws our attention—viz., that due to Nicholas Rescher. I also assess some novel analyses of luck that incorporate plausible elements of Pritchard’s and Rescher’s accounts.     

Stressful events compromise control strivings during a major life transition

Prior research on stressful events has largely ignored their potential impact on motivational processes. This study prospectively examined the association of a stressful event with control strivings in the school-to-work transition. Five waves of data on stressful events, control strategies, and potential mediating variables were collected from an adolescent sample in Berlin (N = 420) during the year before high school graduation. The occurrence of a stressful event (death of family member, parent divorce) predicted a decline in general career-related and specific apprenticeship-related control strivings. This association was mediated by a decline in control-related means-ends beliefs. Proximity to the deadline of graduation exacerbated this association for apprenticeship-seeking control strivings, but this effect was buffered by usage of selective secondary control strategies (cognitive strategies to enhance commitment to a goal). Thus, stressful events can exacerbate challenges and require additional means of control striving.

The impact of within country heterogeneity in vocational specificity on initial job matches and job status

This paper analyses the impact of vocational specificity on school-to-work transitions in terms of initial job mismatches and socioeconomic status at the individual level. Considering heterogeneity amongst the various qualifications in Austria, the study finds that the positive impact of specificity on initial labour market placement known from cross-country research also holds within the highly stratified Austrian system in which various vocational specialisations are provided at the upper secondary level. Independent of the level and field of the qualification obtained, vocational specificity facilitates initial labour market placement, resulting in a reduced mismatch risk and an increase in initial jobs status. In the course of subsequent labour market adjustments, however, holders of general qualifications attain higher status gains when changing jobs. Likewise, the overqualified can make up for a good part of their initial status penalty on labour market entrance through job changes. Implications for policy and practice are discussed.     

Domestic cat walking parallels human constrained optimization: Optimization strategies and the comparison of normal and sensory deficient individuals

To evaluate how fundamental gait parameters used in walking (stride length, frequency, speed) are selected by cats we compared stride characteristics selected when walking on a solid surface to those selected when they were constrained to specific stride lengths using a pedestal walkway. Humans spontaneously select substantially different stride length–stride frequency–speed relationships in walking when each of these parameters is constrained, as in walking to a metronome beat (frequency constrained), evenly spaced floor markers (stride length constrained) or on a treadmill (speed constrained). In humans such adjustments largely provide energetic economy under the prescribed walking conditions. Cats show a similar shift in gait parameter selection between conditions as observed in humans. This suggests that cats (and by extension, quadrupedal mammals) also select gait parameters to optimize walking cost-effectiveness. Cats with a profound peripheral sensory deficit (from pyridoxine overdose) appeared to parallel the optimization seen in healthy cats, but without the same level of precision. Recent studies in humans suggest that gait optimization may proceed in two stages – a fast perception-based stage that provides the initial gait selection strategy which is then fine-tuned by feedback. The sensory deficit cats appeared unable to accomplish the feedback-dependent aspect of this process.     

The influence of social instructions on the effectiveness of a cognitive interview used with very young child witnesses

IntroductionThe modified cognitive interview (MCI) is an investigative interview method used to help child eyewitnesses to enhance the quality of their testimonies (Memon et al., 2010). Composed of cognitive (mnemonics) and social instructions, it indeed supports young witnesses to retrieve and to accurately report all their memories. If the benefits of the mnemonics on the MCI efficiency have been now established (e.g., Holliday & Albon, 2004; Verkampt & Ginet, 2010), the contribution of its social components has however not been deeply explored to date. This is notably the case of two main social instructions presented at the right beginning of an interview: the “Child can say ‘I don’t know”’ and the “Interviewer knows nothing about the facts” instructions.ObjectiveThis study aimed at evaluating the influence of these two social instructions on the effectiveness of MCI mnemonics, designed to be used by police officers to gather very young children's testimonies.MethodTo this end, 59 children aged 4 to 5.9 participated in a painting session and were interviewed two days later with a full modified cognitive interview (MCI), a MCI minus the “Child can say I don’t know” instruction, a MCI minus the “Interviewer knows nothing about the event” instruction, or a structured (control) interview that was solely composed of social instructions.ResultsThe results indicated an increase of 42% more correct information recollected with a full MCI relative to a structured interview during the free recall phase. However, the withdrawal of the “Interviewer knows nothing about the event” instruction from the MCI led the children to report 21% less information. This drop reached 3% with the MCI minus the “Child can say I don’t know” instruction.ConclusionChildren testimonies are therefore more informative when the mnemonics of the MCI are presented to the children along with social instructions.     

Muscle strength and functional performance is markedly impaired at the recommended time point for sport return after anterior cruciate ligament reconstruction in recreational athletes

PurposeTo examine potential deficits in muscle strength or functional capacity when comparing (1) an ACL reconstructed group to matched healthy controls, (2) the ACL reconstructed leg to the non-injured leg and (3) the non-injured leg to matched healthy controls, at the time-point of recommended sport return 9–12 months post-surgery.MethodsSixteen patients (male-female ratio: 9:7) 9–12 months post ACL reconstruction and sixteen age and sex matched healthy controls were included. Outcome measures included maximal knee extensor (KE) and knee flexor (KF) dynamometry, including measurement of rate of force development, functional capacity (counter movement jump (CMJ) and single distance hop (SDH)) and the Lysholm score.ResultsCompared to the control group, maximal KE and KF muscle strength were impaired in the ACL reconstructed leg by 27–39% and 16–35%, respectively (p < .001). Also, impairments of both CMJ (38%) and SDH (33%) were observed (p < .001). Rate of force development for KE were reduced in the ACL group compared to the control group (p < .001). Similarly, the KE and KF muscle strength, CMJ and SDH of the ACL reconstructed leg were impaired, when compared to the non-injured leg by 15–23%, 8–20%, 23% and 20%, respectively (p < .05).ConclusionMuscle strength and functional capacity are markedly impaired in the ACL reconstructed leg of recreationally active people 9–12 months post-surgery when compared to healthy matched controls and to their non-injured leg. This suggests that objective criteria rather than “time-since-surgery” criteria should guide return to sport.