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Recent visual evoked potential (VEP) studies suggest that during sustained voluntary attention, irrelevant or unattended visual stimuli may be filtered precortically. Testing of this hypothesis in humans requires knowledge of the origin of specific components of the VEP that are affected by selective attention. This study describes techniques and procedures for distinguishing between retinal and nonretinal components of VEPs recorded from electrodes placed strategically around the eyes and on the forehead. By visually stimulating one eye at a time while recording simultaneously from both, and by stimulating a given retinal area with the eyes fixated on the target at different angular deviations from the normal line of regard, components of the VEPs around the eyes can be distinguished as of retinal or nonretinal origin. The results are discussed in terms of volume conduction theory. 相似文献
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The current case study illustrates the innovative potential of combined medical and psychological treatment of postchemotherapy nausea and vomiting for cancer patients. A 58-yr-old male patient diagnosed with leukemia and on a weekly cytosine arabinoside (Ara-C) treatment protocol, experienced violent vomiting episodes approximately 3 hr. after each injection. Emesis was so severe that the patient considered terminating treatment. Control was attempted with antiemetics (Compazine, Reglan), an antianxiety agent (Valium), an hypnotic (Dalmane), canabinol, hypnosis, and relaxation training without success. A re-examination of these strategies employing experimental rigor and data-responsive experimental designs indicated how success can be achieved without the necessity of new interventions. The patient experienced complete emetic relief and at 3-yr. follow-up remained symptom-free. 相似文献
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J H Flowers M L Polansky S Kerl 《Journal of experimental psychology. Human perception and performance》1981,7(1):157-166
Highly familiar letter sequences (English words) in noncued portions of a tachistoscopic display were shown to substantially reduce accuracy of partial report. These findings suggest that in addition to facilitating character scanning, familiarity may operate in automatically directing attentional resources to a particular spatial region of a display. Such attentional capture may be disruptive if the material to be reported is presented at another location. 相似文献
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Individuals with developmental dyslexia are often impaired in their ability to process certain linguistic and even basic non-linguistic auditory signals. Recent investigations report conflicting findings regarding impaired low-level binaural detection mechanisms associated with dyslexia. Binaural impairment has been hypothesized to stem from a general low-level processing disorder for temporally fine sensory stimuli. Here we use a new behavioral paradigm to address this issue. We compared the response times of dyslexic listeners and their matched controls in a tone-in-noise detection task. The tonal signals were either Huggins Pitch (HP), a stimulus requiring binaural processing to elicit a pitch percept, or a pure tone-perceptually similar but physically very different signals. The results showed no difference between the two groups specific to the processing of HP and thus no evidence for a binaural impairment in dyslexia. However, dyslexic subjects exhibited a general difficulty in extracting tonal objects from background noise, manifested by a globally delayed detection speed. 相似文献
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Individual in-depth interviews with 14 people with chronic fatigue syndrome (CFS) were conducted, focusing on the experience of living with CFS. The interviews were transcribed verbatim and were analysed for recurrent themes using interpretative phenomenological analysis (IPA). Here we present two inter-related themes: “Negotiating a diagnosis” and “Negotiating CFS with loved ones”. Participants reported delay, negotiation and debate over diagnosis: further, they perceived their GPs to be sceptical, disrespectful and to be lacking in knowledge and interpersonal skills. However, participants found delegitimising encounters with their partners more difficult to deal with. Participants viewed such delegitimation as a form of personal rejection; they were hurt by their loved ones’ reactions and subsequently pondered the price of love, respect and friendship. The findings are discussed in relation to extant literature, and recommendations for future research are suggested. 相似文献
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Race group differences in suicide death classification in a sample of 109 Black and White university students were examined. Participants were randomly assigned to read three vignettes for which the vignette subjects' race (only) varied. The vignettes each described a circumstance (terminal illness, academic failure, or relationship difficulties) that preceded the vignette subject's ambiguously premature death. Participants were asked to describe "what happened." Black participants were significantly less likely than White participants to attribute a vignette target's death to suicide and also less likely to report that suicide is acceptable. Implications for future research and prevention efforts are discussed. 相似文献