From body form to biological motion: the apparent velocity of human movement biases subjective time

In two experiments, we investigated time perception during apparent biological motion. Pictures of initial, intermediate, and final positions of a single movement were presented, with interstimulus intervals that were constant within trials but varied across trials. Movement paths were manipulated by changing the sequential order of body postures. Increasing the path length produced an increase in perceived movement velocity. To produce an implicit measure of apparent movement dynamics, we also asked participants to judge the duration of a frame surrounding the stimuli. Longer paths with higher apparent movement velocity produced shorter perceived durations. This temporal bias was attenuated for nonbody (Experiment 1) and inverted-body (Experiment 2) control stimuli. As an explanation for these findings, we propose an automatic top-down mechanism of biological-motion perception that binds successive body postures into a continuous perception of movement. We show that this mechanism is associated with velocity-dependent temporal compression. Furthermore, this mechanism operates on-line, bridging the intervals between static stimuli, and is specific to configural processing of body form.     

Continuous priming effects on discrete response choices

When primed by backward-masked, target-like stimuli, discrete responses (e.g. button presses) to simple visual targets can be slower when prime and target match (compatible) than when they do not (incompatible). The current study investigated the nature of the stimulus–response mapping underlying this negative compatibility effect (NCE). Discrete left–right responses to arrow targets were primed with arrows oriented in one of 16 directions. Responses were either a standard button press or a 10 cm movement on a graphics tablet. Both tasks showed an identical NCE; importantly, reaction times in both tasks decreased smoothly as the angular distance between prime and target increased (i.e. as compatibility decreased), with the largest NCE evident between the extreme cases (prime-target distances of 0° and 180°). Primes exerted an effect on the required response in proportion to the amount of overlap (reflecting population vector coding). The mapping between the priming stimulus and response is continuous, not categorical.     

Presuppositions and Quantifier Domains

In this paper, I will argue for a new account of presuppositions which is based on double indexing as well as minimal representational contexts providing antecedent material for anaphoric presuppositions, rather than notions of context defined in terms of the interlocutors’ pragmatic presuppositions or the information accumulated from the preceding discourse. This account applies in particular to new phenomena concerning the presupposition of quantifier domains. But it is also intended to be an account of presuppositions in general. The account differs from the Satisfaction Theory and the Binding Theory of presuppositions in that it can be viewed as a conservative extension of traditional static semantics and in that it does not involve the notion of pragmatic presupposition.     

Employee adaptive performance and job satisfaction during organizational crisis: the role of self-leadership

This study tests the hypothesis that self-leadership is positively related with employee adaptive performance and job satisfaction in rapid change and unpredictable work environments. This assumption was tested through a quasi-experimental study regarding the implementation of a self-leadership training programme in the Private Banking department of an international bank. Change in private bankers’ self-leadership, adaptive performance and job satisfaction was measured three times, over a period of 8 months. During the fourth month of the training programme implementation, the bank underwent an unexpected bailout. Fifty-two private bankers were randomly assigned to an experimental group (n = 28) and to a control group (n = 24). The results showed an increase in self-leadership, adaptive performance and job satisfaction for the experimental group, while job satisfaction decreased for participants in the control group. Our findings suggest that change in the level of self-leadership is positively related with change in the level of adaptive performance and job satisfaction over time. This study presents new evidence that individual adaptive performance and job satisfaction can be enhanced through self-leadership training. Self-leadership training can be used as a valuable tool to help organizations improve employees’ adaptive performance and job satisfaction, especially during organizational crisis.     

Social attention in keas, dogs, and human children

Understanding animals’ abilities to cooperate with and learn from each other has been an active field of research in recent years. One important basis for all types of social interactions is the disposition of animals to pay attention to each other—a factor often neglected in discussions and experiments. Since attention differs between species as well as between individuals, it is likely to influence the amount and type of information different species and/or observers may extract from conspecifics in any given situation. Here, we carried out a standardized comparative study on attention towards a model demonstrating food-related behavior in keas, dogs and children. In a series of experimental sessions, individuals watched different conspecific models while searching, manipulating and feeding. Visual access to the demonstration was provided by two observation holes, which allowed us to determine exactly how often and for how long observers watched the model. We found profound differences in the factors that influence attention within as well as between the tested species. This study suggests that attention should be incorporated as an important variable when testing species in social situations.     

Dissociating local and global levels of perceptuo-motor control in masked priming

Masked prime stimuli presented near the threshold of conscious awareness affect responses to subsequent targets. The direction of these priming effects depends on the interval between masked prime and target. With short intervals, benefits for compatible trials (primes and targets mapped to the same response) and costs for incompatible trials are observed. This pattern reverses with longer intervals. We argue (a) that these effects reflect the initial activation and subsequent self-inhibition of the primed response, and the corresponding inhibition and subsequent disinhibition of the nonprimed response, and (b) that they are generated at dissociable local (within response channels) and global (between channels) levels of motor control. In two experiments, global-level priming effects were modulated by changing the number of response alternatives, whereas local-level effects remained unaffected. These experiments suggest that low-level motor control mechanisms can be successfully decomposed into separable subcomponents, operating at different levels within the motor system.     

SWIFT: a dynamical model of saccade generation during reading

Mathematical models have become an important tool for understanding the control of eye movements during reading. Main goals of the development of the SWIFT model (R. Engbert, A. Longtin, & R. Kliegl, 2002) were to investigate the possibility of spatially distributed processing and to implement a general mechanism for all types of eye movements observed in reading experiments. The authors present an advanced version of SWIFT that integrates properties of the oculomotor system and effects of word recognition to explain many of the experimental phenomena faced in reading research. They propose new procedures for the estimation of model parameters and for the test of the model's performance. They also present a mathematical analysis of the dynamics of the SWIFT model. Finally, within this framework, they present an analysis of the transition from parallel to serial processing.     

The finitude of life—How mortality salience affects consumer behavior: A review

The influence of mortality salience (MS) on consumer behavior has been well-established over the last 25 years. However, research findings have provided divergent insights with regard to the direction of its outcomes. This article provides a systematic review of the extant research stream thereby revealing how the differences are primarily due to the conceptualization and operationalization of MS. Based on a conceptual revision of MS, we suggest an extended definition of the concept. An extensive overview of empirical findings, together with a holistic presentation of influential factors, offers a foundation for further MS studies conducted in a consumer behavior context, concluding with an extensive research agenda.     

Schematic influences of rape myth acceptance on visual information processing: An eye-tracking approach

Schematic influences of rape myth acceptance (RMA) on visual information processing were studied. After reading a short text on a rape case, students viewed a “police photograph” of the plaintiff's living room, where the rape allegedly happened, while their eye-movements were recorded. The photograph contained two myth-consistent cues, one being expected in the situation (wine bottle and glasses), the other unexpected (poster of a nude male). Results of Study 1 (N = 60) showed that participants higher in RMA fixated the expected cue both earlier and less long, which may indicate hypervigilance and greater ease of processing, respectively. Higher RMA also predicted longer initial fixation of the unexpected cue. These processing differences mediated participants' verdicts and blame judgments. In Study 2 (N = 30), participants' level of RMA was manipulated experimentally via social norm feedback. This manipulation significantly affected eye-movement patterns for the expected myth-consistent cue. Results support the notion that RMA actively guides visual information processing of relevant stimuli.