Transformations of mathematical and stimulus functions

Following a pretest, 8 participants who were unfamiliar with algebraic and trigonometric functions received a brief presentation on the rectangular coordinate system. Next, they participated in a computer-interactive matching-to-sample procedure that trained formula-to-formula and formula-to-graph relations. Then, they were exposed to 40 novel formula-to-graph tests and 10 novel graph-to-formula tests. Seven of the 8 participants showed substantial improvement in identifying formula-to-graph relations; however, in the test of novel graph-to-formula relations, participants tended to select equations in their factored form. Next, we manipulated contextual cues in the form of rules regarding mathematical preferences. First, we informed participants that standard forms of equations were preferred over factored forms. In a subsequent test of 10 additional novel graph-to-formula relations, participants shifted their selections to favor equations in their standard form. This preference reversed during 10 more tests when financial reward was made contingent on correct identification of formulas in factored form. Formula preferences and transformation of novel mathematical and stimulus functions are discussed.     

Moving farther but faster: an exception to Fitts's law

Fitts's law holds that movement time (MT) increases with longer distances. Here we report a violation of this law: When the target appears in a structured, linear display with placeholders indicating the possible target locations, MT to the most distant target is not longer than MT to the second most distant target, but rather tends to be shorter. Furthermore, the presence of placeholders attenuates the range effect that occurs in the absence of placeholders. These findings suggest that Fitts's law may be limited to egocentric visuomotor action, and that the visual control of hand movements may use allocentric, in addition to egocentric, spatial information.     

Trait and social processes in the link between social support and affect: an experimental, laboratory investigation

This study investigated the extent to which the link between perceived social support and affect reflected support recipients' trait perceived support as well as three distinct social processes: the objective supportiveness of providers, the unique relationships among recipients and providers that were stable over occasions, as well as the unique relationships that varied across occasions. Ten recipients interacted with each of the same four providers on five separate occasions, for a total of 200 interactions. Recipients and independent observers rated recipient affect and provider support. Greater perceived support was related to greater positive affect for recipients' trait perceived support, as well as for relationships that were stable over occasions and relationships that varied across occasions. No social support effects were found for negative affect. Perceived similarity was a consistent predictor of recipients' support perceptions. Implications for social support models and interventions were discussed.     

The control of saccade trajectories: direction of curvature depends on prior knowledge of target location and saccade latency

Recent reports have shown that saccades can deviate either toward or away from distractors. However, the specific conditions responsible for the change in initial saccade direction are not known. One possibility, examined here, is that the direction of curvature (toward or away from distractors) reflects preparatory tuning of the oculomotor system when the location of the target and distractor are known in advance. This was investigated by examining saccade trajectories under predictable and unpredictable target conditions. In Experiment 1, the targets and the distractors appeared unpredictably, whereas in Experiment 2 an arrow cue presented at fixation indicated the location of the forthcoming target prior to stimulus onset. Saccades were made to targets on the horizontal, vertical, and principal oblique axis, and distractors appeared simultaneously at an adjacent location (a separation of +/- 45 degrees of visual angle). On average, saccade trajectories curved toward distractors when target locations were unpredictable and curved away from distractors when target locations were known in advance. There was no overall difference in mean saccade latencies between the two experiments. The magnitude of the distractor modulation of saccade trajectory (either toward or away from) was comparable across the different saccade directions (horizontal, vertical, and oblique). These results are interpreted in terms of the time course of competitive interactions operating in the neural structures involved in the suppression of distractors and the selection of a saccade target. A relatively slow mechanism that inhibits movements to distractors produces curvature away from the distractor. This mechanism has more time to operate when target location is predictable, increasing the likelihood that the saccade trajectory will deviate away from the distractor.     

Word order variation in spatial descriptions with adverbs

Previous research has shown that in a three-term spatial reasoning task, the second premise of a German premise pair is especially easy to comprehend if (1) the prepositional object rather than the grammatical subject denotes the given entity, and if (2) the term denoting the given entity precedes the term denoting the new entity. Accordingly, the second premise is easiest to comprehend with noncanonical word order--that is, with the prepositional object in preverbal position denoting the given entity (e.g., To the right of the given object is the new subject). This finding is explained in terms of contextual licensing of noncanonical word order. Here, we discuss and tested two alternative accounts of contextual licensing, given-new and partially ordered set relations (Poset). The given-new account claims that noncanonical word order is licensed by the term denoting the given entity preceding the term denoting the new entity. On the Poset account, noncanonical word order is licensed if the preverbal constituent introduces a new entity that stands in a transitive, irreflexive, and asymmetric relation to a given entity. Comprehension times for second premises with spatial adverbs in four different word orders support both accounts of contextual licensing; Poset licensing was stronger than given-new licensing.     

Judging the contact-times of multiple objects: Evidence for asymmetric interference

The accuracy of time-to-contact (TTC) judgments for single approaching objects is well researched, however, close to nothing is known about our ability to make simultaneous TTC judgments for two or more objects. Such complex judgments are required in many everyday situations, for instance when crossing a multi-lane street or when engaged in multi-player ball games. We used a prediction-motion paradigm in which participants simultaneously estimated the absolute TTC of two objects, and compared the performance to a standard single-object condition. Results showed that the order of arrival of the two objects determined the accuracy of the TTC estimates: Estimation of the first-arriving object was unaffected by the added complexity compared to the one-object condition, whereas the TTC of the second-arriving object was systematically overestimated. This result has broad implications for complex everyday situations. We suggest that it is akin to effects observed in experiments on the psychological refractory period (PRP) and that the proactive interference of the first-arriving object indicates a bottleneck or capacity sharing at the central stage.     

The prevention of anxiety and depression in children from disadvantaged schools

A randomised controlled trial evaluated the Aussie Optimism Program in preventing anxiety and depression. Grade 7 students (n = 496) from disadvantaged government schools in Perth Western Australia, participated. Six schools were randomly assigned to Aussie Optimism and six schools received their usual health education lessons. Students completed questionnaires on depression, anxiety, attribution style, and social skills. Parents completed the Child Behavior Checklist. No significant group effects were found for student-reported data. Parents of intervention group only students reported reductions in internalizing problems at post-test. No follow-up group effects were significant. Students and teachers found the program acceptable.     

“Counting” serially presented stimuli by human and nonhuman primates and pigeons

Much of Stewart Hulse's career was spent analyzing how animals can extract patterned information from sequences of stimuli. Yet an additional form of information contained in a sequence may be the number of times different elements occurred. Experiments that required numerical discrimination between different stimulus items presented in sequence are analyzed for primates and pigeons. It is shown that a model based on magnitude discrimination can account well for data from human and nonhuman primate experiments. Similar experiments carried out with pigeons showed a strong recency effect not found with primates. The pigeon data are modeled successfully, however, by assuming that representations of events decay as other events are presented.     

Depression and Social Anxiety in Children: Differential Links with Coping Strategies

Strategies that children use for coping with stressors are known to be related to emotional adjustment, but not enough is understood about specific links with social anxiety and depression. The present investigation tested differentiated associations of social anxiety and depression with specific types of coping strategies, and evaluated the direction of these associations over time. In Study 1, 404 children aged 8–13 years completed a coping scale modified from Kochendefer-Ladd and Skinner (Developmental Psychology 38:267-278, 2002) in order to evaluate factor structure and subscale internal consistency. In Study 2, 270 8–11-year-old children completed depression and social anxiety scales, a sociometric survey, and the coping scale from Study 1, with a follow-up timepoint 9 months later. In Study 1, factor analysis revealed six internally consistent coping subscales. In Study 2, social anxiety and depression were found to have distinctive longitudinal associations with subsequent coping strategies. Decreased problem-solving, social support-seeking, and distraction were uniquely predicted by depression but not by social anxiety. Internalising coping was a stronger outcome of social anxiety, and increased externalising was uniquely predicted by depression. There was also some evidence for a moderating role of peer relations. However, none of the coping strategies predicted changes in depression or social anxiety over the two timepoints. These results highlight the impact that emotional adjustment may have on children’s coping strategies, and clarify important distinctions between social anxiety and depression in relation to coping.     

WANDERING AMONG SHADOWS: THE DISCORDANCE OF TIME IN LEVINAS AND BERGSON

One of the earliest examples of articulating the “discordance of time”—a theme that serves as a guiding thread woven throughout much of the re‐engagement with time that is characteristic of continental philosophy—can be found in a series of essays written by Levinas in the aftermath of World War II. I show how these essays derive from a set of key texts by Bergson and how Bergson already anticipated the distinctive ways of conceptualizing the movement of time that are advanced by Levinas in his early essays. Nevertheless, as I will show, Levinas chooses not to acknowledge this Bergsonian anticipation of his theory of time, despite his recognition, repeated throughout many texts and interviews, of the influence of Bergson on the formation of his own thought. I conclude by reflecting on the complexity of the Bergsonian inheritance in Levinas's philosophy of time.