Effects of auditory feedback on gait behavior,gaze patterns and outcome performance in long jumping

In the current study, we conducted two experiments to investigate the impact of concurrent, action-induced auditory feedback on gait patterns, gaze behavior and outcome performance in long jumping. In Experiment 1, we examined the effects of present vs. absent auditory feedback on gait, gaze and performance outcome measures. Results revealed a significant interaction effect between condition (present vs. absent auditory feedback) and phase (acceleration vs. zeroing-in phase) on participants' step lengths indicating that the absence (rather than the presence) of auditory feedback led to facilitatory effects in terms of a more prototypical gait pattern (i.e., shorter steps in the acceleration phase and longer steps in the zeroing-in phase). Similarly, the absent auditory feedback led to a higher gaze stability in terms of less switches between areas of interest (AOIs). However, there was no effect on jumped distance. In Experiment 2, we scrutinized the influence of concurrent vs. delayed auditory feedback on all three performance parameters. In contrast to concurrent feedback, delayed auditory feedback negatively affected all three measures: participants showed (i) dysfunctional deviations from their prototypical gait pattern (i.e., shorter steps across both phases of the run-up), (ii) less stable, maladaptive gaze patterns (i.e., more switches between AOIs) and (iii) poorer jumping performance (i.e., shorter jumped distances). Together, the two experiments provide clear evidence for the impact of concurrent, action-induced auditory feedback on the coordination of complex, rhythmical motor tasks such as the long jump.     

Acquisition and reversal of a discriminated autoshaped response in male and female rats: Effects of long or short and fixed or variable intertrial interval durations

Groups of male and female Wistar rats were exposed to autoshaping procedures in which the duration (50 vs 20 s) and the variablity (fixed vs variable) of the intertrial interval were manipulated. Pellet delivery occurred after one of the levers (CS+) had been presented for 10 s. Presentation of the other lever (CS−) was not associated with pellet delivery. CS+ contacts occurred more frequently and at higher rates when the intertrial interval was 50 s than when it was 20 s, while intertrial interval variability did not play an important role. Males contacted CS+ and CS− more frequently and at a higher rate than did females. Goal-directed activity (nose pokes in feeder tray) occurred more often when the intertrial interval was short than when it was long. Females showed higher goal-directed activity than did males, both during CS presentation and during the intertrial interval. When experimental contingencies were reversed, CS+ contacts decreased and CS− contacts increased for males and females, but the decrease in CS+ contacts occurred more slowly for males than for females. The results of these experiments add to a growing body of literature suggesting the existence of fundamental behavioral differences between the sexes. These differences are partly attributable to the influence of gonadal hormones during development and maturation and partly attributable to the behavioral requirements of the experimental procedures.     

Post-training ethanol disrupts trace conditioned fear in rats: effects of timing of ethanol, dose and trace interval duration

Ethanol has complex effects on memory performance, although hippocampus-dependent memory may be especially vulnerable to disruption by acute ethanol intoxication occurring during or shortly after a training episode. In the present experiments, the effects of post-training ethanol on delay and trace fear conditioning were examined in adolescent rats. In Experiment 1, 30-day-old Sprague-Dawley rats were given delay or trace conditioning trials in which a 10s flashing light CS was paired with a 0.5 mA shock US. For trace groups, the trace interval was 10 s. On days 31-33, animals were administered ethanol once daily (0.0 or 2.5 g/kg via intragastric intubation), and on day 34 animals were tested for CS-elicited freezing. Results showed that post-training ethanol affected the expression of trace, but had no effect on delay conditioned fear. Experiment 2 revealed that this effect was dose-dependent; doses lower than 2.5 g/kg were without effect. Experiment 3 evaluated whether proximity of ethanol to the time of training or testing was critical. Results show that ethanol administration beginning 24h after training was more detrimental to trace conditioned freezing than administration that was delayed by 48 h. Finally, in Experiment 4 animals were trained with one of three different trace intervals: 1, 3 or 10s. Results indicate that post-training administration of 2.5 g/kg ethanol disrupted trace conditioned fear in subjects trained with a 10s, but not with a 1 or 3s, trace interval. Collectively the results suggest that ethanol administration impairs post-acquisition memory processing of hippocampus-dependent trace fear conditioning.     

Effects of foreperiod interval upon reaction time, alpha blocking, and heart rate under variable conditions with reduced learning factors

The present experiment was to investigate the effects of foreperiod interval upon reaction time (RT), alpha blocking, and heart rate (HR) under conditions in which learning factors and conditional probability were minimized. Twenty college students were given a series of 44 randomized foreperiod intervals (0–30 sec). The fastest RT was obtained at 0.6 sec foreperiod. Alpha blocking provided the same trend as that of RT, showing that the 0.6 sec foreperiod yielded the largest alpha blocking. Positive correlation was observed between the speed of RT and alpha blocking (r = 0.56, p<0.001). HR curve was different from those of RT and alpha blocking. No significant correlation was obtained between RT and HR. The results were discussed, particularly, in terms of the theory of classical conditioning.     

Space,time and memory: tales from a long road

Points, lines and surfaces are the basic elements of Euclidean geometry. In this paper, accompanying a keynote at ICSC 2018, we will explore how, in physics, cognition and our lived experience, it is often better to think in terms of interconnected threads than an evolving state of the world now. In physics ‘now’ is an illusion, merely a convenient construction, each particle and person is more like an independent strand in space–time, and similarly, in our minds, strands of memories from different roles and contexts flow almost independently. Paths create lines on the map and may be inscribed as signs in the landscape, but our journeys along paths create temporal threads that interweave as we meet along the way. This paper draws on my research over many years on time and user interaction and also my personal experiences during a thousand-mile walk around the periphery of Wales in 2013.     

Teachers use of fear appeals and timing reminders prior to high-stakes examinations: pressure from above,below, and within

Teachers often communicate to students the consequences of success and failure (fear appeals) and the timing (timing reminders) of forthcoming examinations. Prior research has examined how fear appeals and teaching reminders are evaluated by students and how they relate to educational outcomes such as engagement. Few studies have addressed the use of these behaviours from a teacher’s perspective. We examined teacher use of consequence and timing reminders, used prior to examinations, and its relation to perceived accountability pressure, teacher self-efficacy, perceived importance of tested outcomes, and the belief that students would interpret such messages as threatening. Data were collected from 854 English primary and secondary school teachers. Results showed that fear appeals and timing reminders were used more frequently when teachers believed that tested outcomes were important, when they had lower self-efficacy to engage students, and when they believed that students would interpret messages as threatening. Timing reminders, but not fear appeals, were used more frequently when perceived accountability pressure was greater. These findings help to understand why teachers are using such behaviours. In this study it was pressures from above, below, and within.     

Violation of the scalar property for time perception between 1 and 2 seconds: evidence from interval discrimination, reproduction, and categorization

According to the hypothesis of a scalar property for time, the variability to time ratio should be constant. Three experiments tested the validity of this hypothesis in a restricted range of durations (standard values = 1, 1.3, 1.6, and 1.9 s). In each experiment, time intervals to be discriminated, reproduced, or categorized were presented with 2, 4, or 6 brief successive auditory signals marking 1, 3, or 5 intervals, respectively. In Experiment 1, participants were asked to indicate whether the interval(s) within a second series of sounds were shorter or longer than those of the first. In Experiment 2, the standard interval had to be reproduced. In Experiment 3, after 10 presentations of the standard, participants had to categorize each comparison interval as shorter or longer than the standard. In addition to showing that performance was generally poorer when only 1 interval was presented and remained about the same regardless of whether 3 or 5 intervals were presented (Experiments 1 and 3), the results demonstrated that the variability to time ratio is not constant across the standard interval conditions. Overall, the ratio is higher at 1.9 than at 1 s. This violation of scalar timing occurs whatever the method used and does not interact with the number-of-interval variable.     

Procrastination and Depression from a Cognitive Perspective: An Exploration of the Associations Among Procrastinatory Automatic Thoughts,Rumination, and Mindfulness

Extensive research indicates that procrastination is associated with many maladaptive outcomes including diminished performance and greater psychological distress, but the specific factors and mechanisms associated with the vulnerability of procrastinators still need to be identified. The current study examined the associations among procrastination, ruminative brooding, mindfulness, and self-compassion. Procrastination was measured in terms of academic procrastination as well as a cognitive measure of procrastination examining the frequency of procrastination-related automatic thoughts. In addition to the main focus on the vulnerability of procrastinators, the question of whether students with multiple vulnerabilities would be particularly at risk for depression was also assessed. A sample of 214 undergraduate students completed measures of academic procrastination, procrastination-related automatic thoughts, rumination, mindfulness, self-compassion, and depression. Correlational analyses showed that both procrastination measures were associated with ruminative brooding as well as reduced mindfulness and self-compassion. Moderator-effect tests yielded no significant interactions. Overall, our findings highlight the relevance of cognitive factors in explaining procrastination and depression. Elevated levels on measures tapping cognitive risk factors (ruminative brooding and procrastination-related automatic thoughts) or a low level of protective, self-relevant cognitive factors associated with resilience (mindfulness and self-compassion) were related to a high level of procrastination and depression. These results imply that procrastinators might be vulnerable to depression due to the joint presence of these cognitive risk and resilience factors.     

Seeing the mind behind the art. People can distinguish abstract expressionist paintings from highly similar paintings by children, chimps, monkeys, and elephants

Museumgoers often scoff that costly abstract expressionist paintings could have been made by a child and have mistaken paintings by chimpanzees for professional art. To test whether people really conflate paintings by professionals with paintings by children and animals, we showed art and nonart students paired images, one by an abstract expressionist and one by a child or animal, and asked which they liked more and which they judged as better. The first set of pairs was presented without labels; the second set had labels (e.g., "artist," "child") that were either correct or reversed. Participants preferred professional paintings and judged them as better than the nonprofessional paintings even when the labels were reversed. Art students preferred professional works more often than did nonart students, but the two groups' judgments did not differ. Participants in both groups were more likely to justify their selections of professional than of nonprofessional works in terms of artists' intentions. The world of abstract art is more accessible than people realize.     

Suicidality, clinical depression, and anxiety disorders are highly prevalent in men who have sex with men in Mumbai, India: findings from a community-recruited sample

In India men who have sex with men (MSM) are a stigmatized and hidden population, vulnerable to a variety of psychosocial and societal stressors. This population is also much more likely to be HIV-infected compared to the general population. However, little research exists about how psychosocial and societal stressors result in mental health problems. A confidential, quantitative mental-health interview was conducted among 150 MSM in Mumbai, India at The Humsafar Trust, the largest non-governmental organization serving MSM in India. The interview collected information on sociodemographics and assessed self-esteem, social support and DSM-IV psychiatric disorders using the Mini International Neuropsychiatric Interview (MINI). Participants' mean age was 25.1 years (SD?=?5.1); 21% were married to women. Forty-five percent reported current suicidal ideation, with 66% low risk, 19% moderate risk, and 15% high risk for suicide per MINI guidelines. Twenty-nine percent screened in for current major depression and 24% for any anxiety disorder. None of the respondents reported current treatment for any psychiatric disorder. In multivariable models controlling for age, education, income, and sexual identity, participants reporting higher levels of self-esteem and greater levels of satisfaction with the social support they receive from family and friends were at lower risk of suicidality (self-esteem AOR?=?0.85, 95% CI: 0.78-0.93; social support AOR?=?0.76, 95% CI: 0.62-0.93) and major depression (self-esteem AOR?=?0.79, 95% CI: 0.71-0.89; social support AOR?=?0.68, 95% CI: 0.54-0.85). Those who reported greater social support satisfaction were also at lower risk of a clinical diagnosis of an anxiety disorder (AOR?=?0.80; 95% CI: 0.65-0.99). MSM in Mumbai have high rates of suicidal ideation, depression, and anxiety. Programs to improve self-esteem and perceived social support may improve these mental health outcomes. Because they are also a high-risk group for HIV, MSM HIV prevention and treatment services may benefit from incorporating mental health services and referrals into their programs.     

Serial processing is consistent with the time course of linguistic information extraction from consecutive words during eye fixations in reading: a response to Inhoff, Eiter, and Radach (2005)

A. W. Inhoff, B. M. Eiter, and R. Radach reported the results of 2 experiments that they claimed were problematic for serial attention models of eye movements in reading (such as the E-Z Reader model). In this reply, the authors demonstrate via argumentation and simulations that their data pose no serious problem for the E-Z Reader model or serial attention models in general.