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181.
Fixational eye movements are not an index of covert attention 总被引:3,自引:0,他引:3
The debate about the nature of fixational eye movements has revived recently with the claim that microsaccades reflect the direction of attentional shifts. A number of studies have shown an association between the direction of attentional cues and the direction of microsaccades. We sought to determine whether microsaccades in attentional tasks are causally related to behavior. Is reaction time (RT) faster when microsaccades point toward the target than when they point in the opposite direction? We used a dual-Purkinje-image eyetracker to measure gaze position while 3 observers (2 of the authors, 1 naive observer) performed an attentional cuing task under three different response conditions: saccadic localization, manual localization, and manual detection. Critical trials were those on which microsaccades moved away from the cue. On these trials, RTs were slower when microsaccades were oriented toward the target than when they were oriented away from the target. We obtained similar results for direction of drift. Cues, not fixational eye movements, predicted behavior. 相似文献
182.
Martin J. Dorahy Christopheralan Lewis Finwell A. M. Wolfe 《Current psychology (New Brunswick, N.J.)》2007,25(4):295-305
Several studies have noted an association between domestic violence and psychological distress. However, little empirical
work has examined behavioral and psychological difficulties, especially with reference to dissociation and guilt, in victims
of domestic violence in Northern Ireland. In addition, childhood abuse history has tended not to be assessed in studies conducted
in the Province. Using measures designed to assess behavioral and psychological difficulties that are problematic to self
and/or others (that is, Brief Symptoms Inventory, General Health Questionnaire, Guilt Inventory), dissociation (that is, Dissociative
Experiences Scale, Peritraumatic Dissociative Experiences Questionnaire) and trauma (that is, Traumatic Experiences Checklist),
the current study assessed Northern Irish victims of domestic violence from shelter-type accommodation (N=33) and a comparison sample of women from the general population (N=33). The domestic violence group displayed significantly more psychological difficulties, including higher depression, anxiety
and dissociation scores. Dissociative episodes at the time of an assault were related to higher on-going dissociative experiences.
Finally, the domestic violence sample reported more emotional, physical, and sexual abuse in childhood than the comparison
group. Despite the difficulty generalizing from victims of domestic violence in shelter-type accommodation to all victims
of spousal abuse, the current results highlight the increased levels of psychological distress in those exposed to abuse by
their partner. 相似文献
183.
Although the five primary senses have traditionally been thought of as separate, examples of their interactions, as well as the neural substrate possibly underlying them, have been identified. Arm position sense, for example, depends on touch, proprioception, and spatial vision of the limb. It is, however, unknown whether position sense is also influenced by more fundamental, nonspatial visual information. Here, we report an illusion that demonstrates that the position sense of the eyelid partly depends on information regarding the relative illumination reported by the two eyes. When only one eye is dark-adapted and both eyes are exposed to a dim environment, the lid of the light-adapted eye feels closed or "droopy." The effect decreases when covering the eye by hand or a patch, thus introducing tactile information congruent with the interocular difference in vision. This reveals that the integration of vision with touch and proprioception is not restricted to higher-level spatial vision, but is instead a more fundamental aspect of sensory processing than has been previously shown. 相似文献
184.
The multiple object tracking (MOT) task has been a useful tool for studying the deployment of limited-capacity visual resources over time. Since it involves sustained attention to multiple objects, this task is a promising model for real-world visual cognition. However, real-world tasks differ in two critical ways from standard laboratory MOT designs. First, in real-world tracking, it is unusual for the set of tracked items to be identified all at once and to remain unchanged over time. Second, real-world tracking tasks may need to be sustained over a period of minutes, and not mere seconds. How well is MOT performance maintained over extended periods of time? In four experiments, we demonstrate that observers can dynamically “juggle” objects in and out of the tracked set with little apparent cost, and can sustain this performance for up to 10 min at a time. This performance requires implicit or explicit feedback. In the absence of feedback, performance tracking drops steadily over the course of several minutes. 相似文献
185.
Todd S. Horowitz Sarah B. Klieger David E. Fencsik Kevin K. Yang George A. Alvarez Jeremy M. Wolfe 《Attention, perception & psychophysics》2007,69(2):172-184
Is content addressable in the representation that subserves performance in multiple-object-tracking (MOT) experiments? We devised an MOT variant that featured unique, nameable objects (cartoon animals) as stimuli. There were two possible response modes: standard, in which observers were asked to report the locations of all target items, and specific, in which observers had to report the location of a particular object (e.g., “Where is the zebra?”). A measure of capacity derived from accuracy allowed for comparisons of the results between conditions. We found that capacity in the specific condition (1.4 to 2.6 items across several experiments) was always reliably lower than capacity in the standard condition (2.3 to 3.4 items). Observers could locate specific objects, indicating a content-addressable representation. However, capacity differences between conditions, as well as differing responses to the experimental manipulations, suggest that there may be two separate systems involved in tracking, one carrying only positional information, and one carrying identity information as well. 相似文献
186.
Christopher R. Wolfe M. Anne Britt Melina Petrovic Michael Albrecht Kristopher Kopp 《Behavior research methods》2009,41(3):691-698
In two experiments, we developed and tested an interactive Web-based tutor to help students identify and evaluate counterarguments.
In Experiment 1, we determined the extent to which high- and low-argumentationability participants were able to identify counterarguments.
We tested the effectiveness of having participants read didactic text regarding counterarguments and highlight claims. Both
preparations had some positive effects that were often limited to high-ability participants. The Web-based intervention included
interactive exercises on identifying and using counterarguments. Web-based presentation was state driven, using a Java Server
Pages page. As participants progressively identified argument elements, the page changed display state and presented feedback
by checking what the user clicked against elements that we had coded in XML beforehand. Instructions and feedback strings
were indexed by state, so that changing state selected new text to display. In Experiment 2, the tutor was effective in teaching
participants to identify counterarguments, recognize responses, and determine whether counterarguments were rebutted, dismissed,
or conceded. 相似文献
187.
188.
Maria C. Marchetti-Mercer Leslie Swartz Vinitha Jithoo Nthopele Mabandla Alessandra Briguglio Maxine Wolfe 《Family process》2020,59(4):1737-1754
In this article, we explore the impact of South African families’ emigration on parents/grandparents who must renegotiate their lives in their loved ones’ physical absence. We adopted a transnational perspective in a bigger qualitative project to consider both sides of the migratory spectrum. Here we focus on elderly family members who remain behind—a group largely neglected in prior research. Our findings illustrate the complex emotions and relational changes experienced by elderly people whose families emigrate. New technologies bridge distances, allowing new ways to connect and take care of each other, and of re-imagining transnational relationships and what constitutes family life, but these bridges cannot negate the loss experienced by those remaining. People have to make sense of the emigration and forge new relational bonds with remaining family members. Our findings stress grandparents’ meaningful role in a family system and highlight some gendered and racial differences in families’ experiences. 相似文献
189.
190.
J M Wolfe 《Perception》1984,13(1):33-40
Most explanations of the Hermann grid illusion are local in nature. For example, in Baumgartner's model the effect is generated by the response of cells having concentric on-off or off-on receptive fields. Such models predict that the magnitude of the illusion at a given intersection should be the same whether that intersection is viewed in isolation or in conjunction with other intersections in a grid. Two experiments are reported. The first demonstrates that illusion magnitude grows with the number of intersections. The second shows that this growth is seen when the intersections are arranged in an orderly grid but not when they are placed irregularly. These results suggest that a purely local model for the Hermann grid illusion is not a complete explanation. Global factors must be involved. 相似文献