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181.
Many species have been shown to encode multiple sources of information to orient. To examine what kinds of information animals
use to locate a goal we manipulated cue rotation, cue availability, and inertial orientation when the food-storing Clark’s
nutcracker (Nucifraga columbiana) was searching for a hidden goal in a circular arena. Three groups of birds were used, each with a different goal–landmark
distance. As the distance between the goal and the landmark increased, nutcrackers were less accurate in finding the correct
direction to the goal than they were at estimating the distance (Experiment 1). To further examine what cues the birds were
using to calculate direction, the featural cues within the environment were rotated by 90° and the birds were either oriented
when searching (Experiments 2 and 3) or disoriented (Experiment 3). In Experiment 4, all distinctive visual cues were removed
(both internal and external to the environment), a novel point of entry was used and the birds were either oriented or disoriented.
We found that disorienting the nutcrackers so that they could not use inertial cues did not influence the birds’ total search
error. The birds relied heavily but not completely on cues within the environment, as rotating available cues caused them
to systematically shift their search behavior. In addition, the birds also relied to some extent on Earth-based cues. These
results show the flexible nature of cue use by the Clark’s nutcracker. Our study shows how multiple sources of spatial information
may be important for extracting multiple bearings for navigation. 相似文献
182.
Recently, the use of liquid crystal displays (LCDs) in computer monitors has increased in popularity. Can LCDs produce results
similar to those obtained in cathode-ray tube (CRT) displays in studies of temporal attention and perception tasks? Performance
in two tasks (metacontrast masking and attentional blink) was examined using an LCD, a CRT oscilloscope, and a raster scan
CRT display. Experiment 1 focused on metacontrast masking where a typical metacontrast function emerged irrespective of monitor
type. Experiments 2 and 3 examined whether differences in monitors influence the attentional blink. Again, all displays elicited
similar performance profiles for both the attentional blink and the trade-off between identification accuracy of the two targets.
Although our results may not generalize to all LCD applications and all experimental paradigms, they indicate that LCDs can
reproduce results similar to those found in metacontrast masking and attentional blink studies that were originally identified
with CRT displays. 相似文献
183.
184.
Ken Alan Jung 《Reviews in Religion & Theology》2006,13(3):340-342
Book reviewed:
Belonging , Lucinda Mosher, Church Publishing 2005 (1-59627-010-1), 186 pp., pb $15.00 相似文献
Belonging , Lucinda Mosher, Church Publishing 2005 (1-59627-010-1), 186 pp., pb $15.00 相似文献
185.
Although previous studies have reported that individual prosocial traits generally enhance synchrony, gender as a social factor was not the subject of focus. The present study examined gender differences in synchrony by conducting three experiments on dyadic unstructured conversations with same-gender strangers. Synchrony was assessed by calculating the cross-wavelet coherence and determining the relative phase. As expected, through the three experiments, the female dyads showed a higher degree of synchrony, compared to the male dyads. Moreover, the conversation type (i.e., structured monologue vs. unstructured dialogue) did not moderate the gender effect (Experiment 2), while synchrony in the female dyads was influenced by the preceding conversation (Experiment 3). In contrast, through the three experiments, the role of the relative phase was unclear. The findings indicate that the social factor, gender, has an impact on synchrony, and that interpersonal sensitivity contributes to synchrony. 相似文献
186.
Joyce M. Alexander Kathy E. Johnson Mary E. Leibham Ken Kelley 《Cognitive development》2008,23(2):324-334
We conducted a longitudinal analysis of the relative intensity and duration of interests associated with conceptual domains between the ages of 4 and 6 years, respectively. Results indicated a significant portion of preschool children do sustain an interest in conceptual domains during some portion of their childhood. Expected gender differences were found, with boys more likely to express an interest in a conceptual domain than girls. A latent growth curve analysis revealed that the probability of exhibiting a conceptual interest declined as school began, though the rate of that decline was similar for both boys and girls. Potential explanations for the decrease in conceptual interests as school begins are considered. 相似文献
187.
S. Allen Wilcoxon Sandy Magnuson Ken Norem 《Journal of multicultural counseling and development》2008,36(3):143-154
The authors suggest that many managed mental health care (MMHC) practices have oppressive effects on members of cultural and ethnic minority groups. They examine the dissonance between institutional practices and cultural traditions that reflect insensitivity and forced conformity, particularly regarding time, pace, and intervention uniformity as applied to clients and commonly required in the MMHC industry. Los autores sugieren que muchas prácticas del cuidado administrado de la salud mental (MMHC, por sus siglas en inglés) tienen efectos opresivos sobre los miembros de grupos de minorías étnicas y culturales. Examinan también la disonancia entre prácticas institucionales y tradiciones culturales que reflejan insensibilidad y una conformidad forzada, sobre todo en lo referente a tiempo, ritmo y uniformidad de intervención tal y como se aplica a clientes y normalmente requeridos por la industria de MMHC. 相似文献
188.
Ken Binmore 《Topoi》2008,27(1-2):17-27
Do conventions need to be common knowledge in order to work? David Lewis builds this requirement into his definition of a convention. This paper explores the extent to which his approach finds support in the game theory literature. The knowledge formalism developed by Robert Aumann and others militates against Lewis’s approach, because it shows that it is almost impossible for something to become common knowledge in a large society. On the other hand, Ariel Rubinstein’s Email Game suggests that coordinated action is no less hard for rational players without a common knowledge requirement. But an unnecessary simplifying assumption in the Email Game turns out to be doing all the work, and the current paper concludes that common knowledge is better excluded from a definition of the conventions that we use to regulate our daily lives. 相似文献
189.
190.
Ken Warmbrd 《The Philosophical quarterly》2004,54(215):266-286
I show to be unsuccessful several attempts to demonstrate the possibility of time without change. Consideration of the most prominent of these arguments (by Sydney Shoemaker) then leads to the formulation of a general argument: evidence which justifies a claim that a certain amount of time has elapsed also justifies a claim that continuous change has occurred during the period. Hence there is a sound basis for the relationist claim that there is no time without events. 相似文献