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251.
It has been demonstrated that the human visual field shows some functional inhomogeneities, in particular when the central
and perifoveal regions are compared to the more peripheral regions. The present study examined this inhomogeneity by examining
the effect of stimulus eccentricity on inhibition of return (IOR), a phenomenon that biases our attention towards novel locations
against returning it back to previously attended locations. Eighteen subjects were examined in a visual detection task, in
which a target appeared randomly following a nonpredictive spatial cue in the visual field. The eccentricities of the cues
and targets were systematically manipulated from 5° to 30° with 5° increments. Results showed that response times to targets
that appeared at cued locations were significantly slower than those at uncued locations for all stimulus eccentricities,
demonstrating the IOR effects. However, response times at cued locations increased significantly when stimulus eccentricity
shifted from 15° to 20°, leading to a much stronger IOR effect at more peripheral regions compared to central and perifoveal
regions, indicating a functional dissociation between these two regions of the visual field. Possible neural mechanisms underlying
this dissociation are discussed, and two attention systems modulating the two functional regions of the visual field are put
forward to best account the present finding implicating in particular midbrain mechanism. 相似文献
252.
Selective attention to threat in the dot probe paradigm: differentiating vigilance and difficulty to disengage 总被引:10,自引:0,他引:10
The dot probe task [J Abnorm Psychol 95 (1986) 15] is an often-used paradigm to investigate selective attention to threat. A facilitated response to probes that appear at the same location of threat information in comparison with responses to probes at the opposite location of threat information is interpreted as vigilance for threat. We argue that the findings in the dot probe paradigm are ambiguous evidence for the vigilance to threat hypothesis. Results can also be interpreted as a difficulty to disengage from threat. In this study, 44 undergraduates performed a pictorial version of the probe detection task. Taking into account the reaction times on neutral trials, we found no evidence for a facilitated detection of threatening information. It was found that the dot probe effects are at least partially due to disengagement effects. The implications of these results for the understanding of attentional bias in normal and anxious individuals are discussed. 相似文献
253.
In the complexity of the entangled interactions within the group of psychoanalytical pionneers, their divergent interests and views, the Ferenczi-Jung relationship is of particular interest given the importance that both had in the field of the history of ideas. It is striking to discover some parallel lines, but interpersonal, institutional and socio-cultural factors contributed to the fact that this peaceful and complementary collaboration was not possible in the long run. Perhaps for the present generation, in retrospective, it is easier to notice seminal strokes and also some deficiencies in all these thinkers. 相似文献
254.
Determinants of health knowledge: an investigation of age,gender, abilities,personality, and interests 总被引:5,自引:0,他引:5
Ten areas of health knowledge were investigated in 2 studies, 1 of college students (N = 169) and 1 of adults from the community (ages 19-70; N = 176). Measures assessed knowledge of aging, orthopedic/dermatological concerns, common illnesses, childhood/early life, serious illnesses, mental health, nutrition, reproduction, safety, and treatment of illness/disease. Significant gender differences favoring women were found for most areas of health knowledge, especially reproduction and early life. Results showed that cognitive ability accounted for the most variance in health knowledge with nonability (personality and interest traits) and demographic variables accounting for smaller but significant amounts of variance across most knowledge domains. 相似文献
255.
"Economic man" in cross-cultural perspective: behavioral experiments in 15 small-scale societies 总被引:1,自引:0,他引:1
Henrich J Boyd R Bowles S Camerer C Fehr E Gintis H McElreath R Alvard M Barr A Ensminger J Henrich NS Hill K Gil-White F Gurven M Marlowe FW Patton JQ Tracer D 《The Behavioral and brain sciences》2005,28(6):795-815; discussion 815-55
Researchers from across the social sciences have found consistent deviations from the predictions of the canonical model of self-interest in hundreds of experiments from around the world. This research, however, cannot determine whether the uniformity results from universal patterns of human behavior or from the limited cultural variation available among the university students used in virtually all prior experimental work. To address this, we undertook a cross-cultural study of behavior in ultimatum, public goods, and dictator games in a range of small-scale societies exhibiting a wide variety of economic and cultural conditions. We found, first, that the canonical model - based on self-interest - fails in all of the societies studied. Second, our data reveal substantially more behavioral variability across social groups than has been found in previous research. Third, group-level differences in economic organization and the structure of social interactions explain a substantial portion of the behavioral variation across societies: the higher the degree of market integration and the higher the payoffs to cooperation in everyday life, the greater the level of prosociality expressed in experimental games. Fourth, the available individual-level economic and demographic variables do not consistently explain game behavior, either within or across groups. Fifth, in many cases experimental play appears to reflect the common interactional patterns of everyday life. 相似文献
256.
Postural control in otolith disorders 总被引:1,自引:0,他引:1
It was the aim of the present paper to investigate the influence of otolith disorders on human postural control by different methods. The 33 patients of our study had undergone a minor head injury and suffered subsequently from an utricular or sacculo-utricular disorder as evidenced by vestibular evoked myogenic potential recordings and eccentric rotation recordings of the otolith-ocular responses. Postural control was assessed by performing stance/gait tests (standard balance deficit test, SBDT) and by evaluating trunk sway (using angular velocity sensors). Moreover, classical tests of the posterior column of the spinal tract (Romberg/Unterberger) and the dynamic posturography (sensory organization test, SOT) were included. It could be shown that SBDT tasks with reduced proprioceptive and visual cues (e.g. standing on foam, eyes closed) are most sensitive for an otolith disorder. The patients showed an increased trunk sway in the pitch plane (i.e. linear motion as adequate utricular stimulus) and an increase in sway velocities (i.e. tilting movements as adequate saccular stimulus) compared to controls. The SOT was most sensitive for combined (sacculo-utricular) otolith disorders (78%) while vestibulospinal tests are not enough sensitive. In essence, otolith disorders evidently impair human postural control and have been possibly underestimated as a source of posttraumatic postural imbalance as yet. 相似文献
257.
It has become fashionable to equate constructs of working memory (WM) and general intelligence (g). Few investigations have provided direct evidence that WM and g measures yield similar ordering of individuals. Correlational investigations have yielded mixed results. The authors assess the construct space for WM and g and demonstrate that WM shares substantial variance with perceptual speed (PS) constructs. Thirty-six ability tests representing verbal, numerical, spatial, and PS abilities; the Raven Advanced Progressive Matrices; and 7 WM tests were administered to 135 adults. A nomological representation for WM is provided through a series of cognitive and PS ability models. Construct overlap between PS and WM is further investigated with attention to complexity, processing differences, and practice effects. 相似文献
258.
Rothkopf EZ Dashen M Kim T 《Journal of experimental psychology. Learning, memory, and cognition》2002,28(5):983-998
The authors confirmed E. Z. Rothkopf and M. L. Dashen's (1995) finding that specific problem context, such as thematic surface features, forms associative connections with deep problem features and thus speeds particular decisions (particularization). In 5 experiments, using a 3-bit decision task and pre-memorized decision rules, the authors found that the ability of a situational context to reinstate was decreased by its replacement by another modal surface context. Context reinstatement, as measured by decision speed, depended on both global and recent local densities of specific problem features linked to a particular decision. The authors' results are consistent with J. R. Anderson and L. J. Schooler's (1991) needs/odds analysis and suggest a push-down file model for diverse context influences as a mechanism for responding to changing situational demands. 相似文献
259.
Cacioppo JT Hawkley LC Berntson GG Ernst JM Gibbs AC Stickgold R Hobson JA 《Psychological science》2002,13(4):384-387
Loneliness predicts morbidity and mortality from broad-based causes, but the reasons for this effect remain unclear. Few differences in traditional health behaviors (e.g., smoking, exercise, nutrition) have been found to differentiate lonely and nonlonely individuals. We present evidence that a prototypic restorative behavior—sleep—does make such a differentiation, not through differences in time in bed or in sleep duration, but through differences in efficacy: In the study we report here, lonely individuals evinced poorer sleep efficiency and more time awake after sleep onset than nonlonely individuals. These results, which were observed in controlled laboratory conditions and were found to generalize to the home, suggest that lonely individuals may be less resilient than nonlonely individuals in part because they sleep more poorly. These results also raise the possibility that social factors such as loneliness not only may influence the selection of health behaviors but also may modulate the salubrity of restorative behaviors. 相似文献
260.
The anger superiority effect shows that an angry face is detected more efficiently than a happy face. However, it is still controversial whether attentional allocation to angry faces is a bottom-up process or not. We investigated whether the anger superiority effect is influenced by top-down control, especially working memory (WM). Participants remembered a colour and then searched for differently coloured facial expressions. Just holding the colour information in WM did not modulate the anger superiority effect. However, when increasing the probabilities of trials in which the colour of a target face matched the colour held in WM, participants were inclined to direct attention to the target face regardless of the facial expression. Moreover, the knowledge of high probability of valid trials eliminated the anger superiority effect. These results suggest that the anger superiority effect is modulated by top-down effects of WM, the probability of events and expectancy about these probabilities. 相似文献