Conversation, gaze coordination, and beliefs about visual context

Conversation is supported by the beliefs that people have in common and the perceptual experience that they share. The visual context of a conversation has two aspects: the information that is available to each conversant, and their beliefs about what is present for each other. In our experiment, we separated these factors for the first time and examined their impact on a spontaneous conversation. We manipulated the fact that a visual scene was shared or not and the belief that a visual scene was shared or not. Participants watched videos of actors talking about a controversial topic, then discussed their own views while looking at either a blank screen or the actors. Each believed (correctly or not) that their partner was either looking at a blank screen or the same images. We recorded conversants' eye movements, quantified how they were coordinated, and analyzed their speech patterns. Gaze coordination has been shown to be causally related to the knowledge people share before a conversation, and the information they later recall. Here, we found that both the presence of the visual scene, and beliefs about its presence for another, influenced language use and gaze coordination.     

Personality characteristics of fighter pilots and ground personnel

The training of fighter plane pilots is expensive, yet instruments are rarely used to screen potential pilots prior to flight training. Hence, a measure that can differentiate fighter pilots from other military personnel is needed. This study was an investigation of personality traits that are contributing factors for becoming a pilot in the Air Force, which could serve as screening tools. One hundred and twelve males were recruited from the Air Force university in Taiwan. Follow-up was conducted 2 years later with 73 students who became pilots and 39 who became ground personnel. A further 53 male military personnel of the same age served as controls. Structural equation modeling was used to show that pilots were more extraverted and less neurotic than the ground personnel, and more extraverted than the controls. Paternal overprotection had an indirect association with becoming a pilot through the mediation of the personality traits of extraversion and neuroticism. Mental health was not associated with becoming a pilot. The optimal cut-off point of 4/5 on a scale of extraversion resulted in a high sensitivity (96%) for differentiating between fighter pilots and controls. Independent of psychosocial stressors (mental health), extraversion is associated with the biological mechanisms of an individual, and plays a unique role in the process of becoming a pilot. Therefore, an extraversion index can be used for screening potential military pilots prior to flight training, as a means of reducing costs and managing human resources.     

The Transition Experiences of British Military Veterans

The aim of the current research was to investigate the transition experiences of British military veterans upon exiting the military and rejoining civilian society, asking the specific research question: What effect does the transition from military to civilian life have on the individual's identity? Interpretative Phenomenological Analysis was employed and seven semistructured interviews were carried out with ex‐military personnel. Analysis of the data revealed three superordinate themes: (1) Several Selves: Identity; (2) Soldier and Society: Separation, and (3) Transition Time: Personal Perspective. Current findings suggest that transition from the military back to civilian life is often problematic, with identity complications, feelings of loss, and disconnection both from the military and from society in general. Individuals with a more salient military identity had more difficult transition experiences. Findings are discussed with reference to theories of identity formation, maintenance, and salience and recommendations for future research are made.     

The Deductive-Nomological Account of Metaphysical Explanation

The paper explores a deductive-nomological account of metaphysical explanation: some truths metaphysically explain, or ground, another truth just in case the laws of metaphysics determine the latter truth on the basis of the former. I develop and motivate a specific conception of metaphysical laws, on which they are general rules that regulate the existence and features of derivative entities. I propose an analysis of the notion of ‘determination via the laws’, based on a restricted form of logical entailment. I argue that the DN-account of ground can be defended against the well-known objections to the DN-approach to scientific explanation. The goal of the paper is to show that the DN-account of metaphysical explanation is a well-motivated and defensible theory.     

Toward Common Ground: Catholicism and Pentecostalism in African Christianity

After reviewing the great appeal of Pentecostal/charismatic spirituality as a religious phenomenon that has come to stay on the tapestry of the pastoral ecology of African Christianity, this article suggests a more dynamic and practical interface and collaboration with these movements by the Catholic Church in Africa, using the Vatican Council's embrace of ecumenism and dialogue.     

A social host in the machine? The case of group attention

I argue that akin to mind-body dualism, social-mental dualism is open to critique. That is, mental processes can be inherently social, with sociality ‘baked into’ the architecture of the cognitive mechanism. As a case in point, I introduce the reader to the cognitive mechanism of group attention. In particular, I focus on the differences between group attention and ideomotor imitation in terms of their (a) compliance to the social-mental dichotomy, and (b) contributions to building common knowledge—a prerequisite for human communication and collective action. Finally, I suggest possible implications of group attention scholarship for other social memory phenomena such as social contagion, socially shared memory-induced forgetting, and the saying-is-believing effect.     

The road to understanding is paved with the speaker’s intentions: Cues to the speaker’s attention and intentions affect pronoun comprehension

A series of experiments explore the effects of attention-directing cues on pronoun resolution, contrasting four specific hypotheses about the interpretation of ambiguous pronouns he and she: (1) it is driven by grammatical rules, (2) it is primarily a function of social processing of the speaker’s intention to communicate, (3) it is modulated by the listener’s own egocentric attention, and (4) it is primarily a function of learned probabilistic cues. Experiment 1 demonstrates that pronoun interpretation is guided by the well-known N1 (first-mention) bias, which is also modulated by both the speaker’s gaze and pointing gestures. Experiment 2 demonstrates that a low-level visual capture cue has no effect on pronoun interpretation, in contrast with the social cue of pointing. Experiment 3 uses a novel intentional cue: the same attention-capture flash as in Experiment 2, but with instructions that the cue is intentionally created by the speaker. This cue does modulate the N1 bias, demonstrating the importance of information about the speaker’s intentions to pronoun resolution. Taken in sum, these findings demonstrate that pronoun resolution is a process best categorized as driven by an appreciation of the speaker’s communicative intent, which may be subserved by a sensitivity to predictive cues in the environment.     

Simulating the Impact During Human Jumping by Means of a 4-Degrees-of-Freedom Model With Time-Dependent Properties

The authors simulated the vertical movements of a jumper and the force time courses by means of a 4-degrees-of-freedom model consisting of 4 masses, springs, and dampers. Of the motions simulated, only that of the mass imitating the trunk corresponded to the measured data. The best fit to the measured force curves were obtained in the simulation in which time-dependent model parameters were used. From the results, the authors concluded that at the beginning of the landing, a jumper behaves like a 2-mass model in which the leg segments (thighs, shanks, and feet) effectively combine into 1 mass. After approximately 60 ms, the connections between the leg segments become more compliant and the jumper behaves like a 4-mass model with a soft coupling between the leg segments. The process is equivalent to an increase of the degrees of freedom of the movements. At the end of the ground contact phase during hopping, the jumper has to contract the muscles in order to reach the envisaged jump height. In the model, that contraction could not be satisfactorily simulated.     

Adjustments to Local Friction in Multifinger Prehension

The authors studied the effects of surface friction at the digit-object interface on digit forces and moments when 12 participants statically held an object in a 5-digit grasp. The authors changed low-friction contact (LFC) with rayon and high-friction contact (HFC) with sandpaper independently for each digit in all 32 possible combinations. Normal forces of the thumb and virtual finger (VF), an imagined finger with a mechanical effect equal to that of the 4 fingers, increased with the thumb at LFC or with an increase in the number of fingers at LFC. When the thumb was at LFC, the thumb tangential force decreased. The VF tangential force decreased when the number of fingers at LFC increased. The interaction of the local responses to friction and the synergic responses necessary to maintain the equilibrium explain the coordination of individual digit forces.     

Global and local spatial landmarks: their role during foraging by Columbian ground squirrels (Spermophilus columbianus)

Locating food and refuge is essential for an animal's survival. However, little is known how mammals navigate under natural conditions and cope with given environmental constraints. In a series of six experiments, I investigated landmark-based navigation in free-ranging Columbian ground squirrels (Spermophilus columbianus). Squirrels were trained individually to find a baited platform within an array of nine identical platforms and artificial landmarks set up on their territories. After animals learned the location of the food platform in the array, the position of the latter with respect to local artificial, local natural, and global landmarks was manipulated, and the animal's ability to find the food platform was tested. When only positions of local artificial landmarks were changed, squirrels located food with high accuracy. When the location of the array relative to global landmarks was altered, food-finding accuracy decreased but remained significant. In the absence of known global landmarks, the presence of a familiar route and natural local landmarks resulted in significant but not highly accurate performance. Squirrels likely relied on multiple types of cues when orienting towards a food platform. Local landmarks were used only as a secondary mechanism of navigation, and were not attended to when a familiar route and known global landmarks were present. This study provided insights into landmark use by a wild mammal in a natural situation, and it demonstrated that an array of platforms can be employed to investigate landmark-based navigation under such conditions.