Desktop flight simulators: Simulation fidelity and pilot performance

Improvements in the computing power and visual resolution of modern desktop computing systems, as well as advances in software technology for displaying high-speed animations, have encouraged the development of relatively sophisticated real-time flight simulators for the PC and Macintosh. We review some of the factors that determine how well such programs capture the actual experience of flight. The most significant factor limiting the quality of performance in flying a simulated aircraft is the “frame rate” problem: at low altitudes and in highly detailed visual environments, as in approaching a runway threshold during landing, the computational demands of the animation may necessitate a reduction in the number of frames displayed per second on the screen. The delayed sensory feedback that results proves to be very detrimental to sustaining smooth control of the aircraft, especially during the flare to touchdown where such control is needed most. This finding parallels the well-known effects of delayed auditory feedback (Lee, 1950) and delayed visual feedback (Smith, 1962).     

QUANTITATIVE PSYCHOPHYSICAL AND ELECTRO-PHYSIOLOGICAL DATA ON SOME ODOROUS COMPOUNDS

D rake , B., J ohansson , B., von S ydow , E. & D øving , K. B. Quantitative psychophysical and electrophysiological data on some odorous compounds. Scand.J. Psychol ., 1969, 10 , 89–96.—Magnitude estimations of odor intensity, and electrophysiological responses from frog olfactory epithelia, were obtained for dilution series of 8 odorous compounds. Comparing of data with each other and with known vapor phase concentrations showed relations between pooled psychophysical data and vapor phase concentrations, and between electrophysiological data and vapor phase concentrations, describable by power functions (exponents 0.26–0.50 and 0.18—0.39). There were also high correlations between electrophysiological data and individual as well as pooled psychophysical data. The results give an impression about the feasibility of using a biological detector in gas chromatography.     

School climate and ethnic‐racial identity in school: A longitudinal examination of reciprocal associations

The messages youth receive in schools about how they matter as individuals and as members of ethnic‐racial groups are influential in constructing their developing ethnic‐racial identities (ERI). However, the developing ERI students hold also have a role in shaping their experiences at school. The current study examined the longitudinal and reciprocal association between ERI (exploration and resolution) and school climate (support for cultural pluralism and teacher supportiveness) among 491 Black, Latino, and White middle school youth (M_age = 12.03, SD = 1.05, range: 11–17) in the Midwest. Cross‐lagged analyses revealed that greater perceptions of support for cultural pluralism within the school predicted greater exploration and resolution at later time points for all students. Moreover, greater exploration and resolution among White students was predictive of greater perceptions of support for cultural pluralism at the school. Higher quality teacher–student relationships predicted greater engagement in ERI exploration for all youth. The findings highlight the importance of school climate in helping shape ERI among youth attending a culturally diverse school and the role of such youth in shaping the climate at their school.     

Tempo sensitivity in auditory sequences: Evidence for a multiple-look model

Differential thresholds for tempi (with interonset intervals ranging from 100 to 1,500 msec) were measured using an adaptive 2IFC paradigm for several types of auditory sequences. In Experiment 1, the number of intervals in an isochronous sequence was varied to compare the sensitivity for single intervals withthat for sequences of two to six intervals. Mean relative just noticeable differences (JNDs) decreased as the number of intervals increased (single intervals=6%, two intervals=4%, four intervals=3.2%, six intervals=3%) and were optimal at intermediate tempi for both sequences and single intervals (as low as 1.5% in the range between 300 and 800 msec). In Experiment 2, the sensitivity for different types of irregular sequences was studied. Globally, JNDs for irregular sequences were of an intermediate level between that observed for single intervals and that observed for regular sequences. However, the closer a sequence was to regularity, the lower its relative JND. Experiment 3 demonstrated that musicians were more sensitive than nonmusicians to changes in tempo, and this was true for single intervals and for regular and irregular sequences, demonstrating the role of training on these abilities. The results are discussed in terms of possible underlying mechanisms, in particular those providing a mental representation of the mean and dispersion of successive interval durations.     

Extrarelationship Involvement Among Heterosexual Males: An Explanation Based on the Theory of Planned Behavior, Relationship Quality, and Past Behavior

The present study investigated the reasons why males in relationships engage in extrarelationship involvements (ERls). The theory of planned behavior was used as the basis for a decision-making model for ERI. The contribution of relationship factors and past behavior to explain ERI was also investigated. A division of perceived behavioral control into individual components of self-efficacy, control, and planning was also tested. Different sets of factors were associated with intention and behavior. ERI intentions were predicted by attitudes toward ERI, planning, game-playing love, and positive experience of past ERI. Present ERI behavior was predicted by ERI behavior in the past 6 months. Results generally supported the theory of planned behavior, especially for the prediction of intention.     

Culture in the context of intercultural negotiation.

This study explores culture's effect on behaviors and outcomes in intercultural negotiation and examines how those effects are moderated by role. Eighty U.S. and international students took part in a previously developed negotiation task (Pruitt, 1981) and completed Hui and Triandis's (1986) individualism‐collectivism (INDCOL) scale. Negotiation interactions were coded for information sharing, offers, and distributive tactics. Findings show that a negotiation dyad's collectivism is positively associated with higher joint profit. The effects of culture on both communication behaviors and joint outcomes, however, differ by role of the negotiator. In particular, seller collectivism has larger and more consistent effects on communication behavior and joint profit than buyer collectivism. Results support a ‘culture in context’ perspective of negotiation that takes into account negotiator qualities, contextual and structural features of the negotiation, and mediating processes in addition to cultural values.