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51.
Monitoring of eye movements resulting from the tracking of sound displacements in total darkness confirmed the generally accepted idea that smooth pursuit cannot be induced in the absence of a real visible target. Exclusively saccadic movements were obtained with real and apparent displacements of a constant frequency source and with frequency variations associated to spatially calibrated positions through training for 5 Ss. Smooth pursuit eye movements were only observed if S was allowed to point and follow with his hand the perceived position of acoustic targets. 相似文献
52.
Gauthier M Dacher M Thany SH Niggebrügge C Déglise P Kljucevic P Armengaud C Grünewald B 《Neurobiology of learning and memory》2006,86(2):164-174
In the honeybee Apis mellifera, multiple-trial olfactory conditioning of the proboscis extension response specifically leads to long-term memory (LTM) which can be retrieved more than 24 h after learning. We studied the involvement of nicotinic acetylcholine receptors in the establishment of LTM by injecting the nicotinic antagonists mecamylamine (1 mM), alpha-bungarotoxin (alpha-BGT, 0.1 mM) or methyllycaconitine (MLA, 0.1 mM) into the brain through the median ocellus 20 min before or 20 min after multiple-trial learning. The retention tests were performed 1, 3, and 24 h after learning. Pre-training injections of mecamylamine induced a lower performance during conditioning but had no effect on LTM formation. Post-training injections of mecamylamine did not affect honeybees' performances. Pre-training injections of MLA or post-training injection of alpha-BGT specifically induced LTM impairment whereas acquisition as well as memory retrieval tested 1 or 3 h after learning was normal. This indicates that brain injections of alpha-BGT and MLA did not interfere with learning or medium-term memory. Rather, these blockers affect the LTM. To explain these results, we advance the hypothesis that honeybee alpha-BGT-sensitive acetylcholine receptors are also sensitive to MLA. These receptors could be essential for triggering intracellular mechanisms involved in LTM. By contrast, medium-term memory is not dependent upon these receptors but is affected by mecamylamine. 相似文献
53.
Gauthier CC 《Kennedy Institute of Ethics journal》1993,3(1):21-37
Understanding the philosophical foundations of the principle of respect for autonomy is essential for its proper application within medical ethics. The foundations provided by Immanuel Kant's principle of humanity and John Stuart Mill's principle of liberty share substantial areas of agreement including: the grounding of respect for autonomy in the capacity for rational agency, the restriction of this principle to rational agents, and the important distinction between influence and control. Their work helps to clarify the scope and role of the principle of respect for autonomy in health care delivery; its implications for truth telling, informed consent, and confidentiality; and its relationship to other moral principles, such as beneficence and distributive justice. 相似文献
54.
Bukach CM Vickery TJ Kinka D Gauthier I 《Journal of experimental psychology. Human perception and performance》2012,38(1):14-17
There is growing evidence that individuation experience is necessary for development of expert object discrimination that transfers to new exemplars. Individuation training in human studies has primarily used label association tasks where labels are learned at both the individual and more abstract (basic) level, and expertise criterion requires that individual-level judgments become as fast as basic-level judgments. However, there are training situations when the use of labels is not practical (e.g., with animals or some clinical populations). Moreover, labeling itself can facilitate object discrimination, thus it is unclear what role labels play in the acquisition of expertise in such training paradigms. Here, participants completed an online game that did not require labels in which they interacted with novel objects (Greebles) or control objects (Yufos). Games either required individuation or categorization. We then assessed the impact of this exposure on an abridged Greeble training paradigm. As expected, participants who played Yufo games or Greeble categorization games showed a significant basic-level advantage for Greebles in the abridged training paradigm, typical of novices. However, participants who played the Greeble identity game showed a reduced basic-level advantage, suggesting that individuation without labels may be sufficient to acquire perceptual expertise. 相似文献
55.
Crowding occurs when the perception of a suprathreshold target is impaired by nearby distractors, reflecting a fundamental limitation on visual spatial resolution. It is likely that crowding limits music reading, as each musical note is crowded by adjacent notes and by the five-line staff, similar to word reading, in which letter recognition is reduced by crowding from adjacent letters. Here, we tested the hypothesis that, with extensive experience, music-reading experts have acquired visual skills such that they experience a smaller crowding effect, resulting in higher music-reading fluency. Experts experienced a smaller crowding effect than did novices, but only for musical stimuli, not for control stimuli (Landolt Cs). The magnitude of the crowding effect for musical stimuli could be predicted by individual fluency in music reading. Our results highlight the role of experience in crowding: Visual spatial resolution can be improved specifically for objects associated with perceptual expertise. Music-reading rates are likely limited by crowding, and our results are consistent with the idea that experience alleviates these limitations. 相似文献
56.
Ava Thompson Guillermo Bernal Rita Dudley‐Grant Ishtar Govia Guerda Nicolas Merry Bullock Janel Gauthier 《International journal of psychology》2013,48(6):1321-1331
The Caribbean Regional Conference of Psychology was held in Nassau, The Bahamas, from 15 to 18 November 2011, under the auspices of the International Association of Applied Psychology (IAAP), the International Union of Psychological Science (IUPsyS), and the International Association for Cross‐Cultural Psychology (IACCP). The conference was hosted by the Bahamas Psychological Association, and organized by a committee chaired by Dr Ava Thompson, College of the Bahamas. The CRCP2011 attracted over 400 participants from 37 countries, including 20 nations/territories in the Caribbean. A broad scientific program, organized around six conference themes, addressed strengths and challenges to psychology in the region; the current state of psychological research, assessment, and intervention; historical, cultural, and language influences; and links between Caribbean and global models. Conference outcomes included planning for a series of publications to expand on conference themes and presentations, as well as establishment of a steering group to launch a regional organization to support the science and practice of psychology in the Caribbean. 相似文献
57.
58.
Female-to-male transsexuals (FTMs) are aware that manhood is a test that is separate from simple anatomical maleness. Failure to pass the test carries a penalty of exclusion from the desired rank as well as stigmatization as deviant for having attempted such a feat. Armed with this awareness, they are utilizing modern technology to form a community of virtual support, a study group of sorts, that will facilitate passing that test. This project identifies, through content analysis, various themes of concerns of female-to-male transsexuals who post on the Internet. The themes include concerns about gender status production, including issues such as “passing,” surgical worries, legal avenues and blockades, and social support. These themes relate directly to FTMs’ real-world ideologies about themselves as men. They recognize their central problem as one which debates the nature of manhood as either an ascribed or achieved status, and in self-reflexive fashion are able to see themselves as non-deviant in one gender category, yet deviant to onlookers while in another gender category. For FTMs, the fear is that even if medical and legal obstacles can be overcome, social obstacles and social stigmatization may not. Yet, in their cyber-community, a number of FTMs have found acceptance and understanding to be less elusive than what they find in the real world. 相似文献
59.
This study examines the life histories of male and female crack addicts outside of the inner city context, focusing on gendered variation in experiences related to childhood background, pathways into crack cocaine use, income generation strategies, and violence. We offer insight into the nature of crack use and culture outside of the inner city and question the generalizability of previous studies to communities outside of the inner city. Furthermore, the question of women's emancipation and the subsequent impact this has had on their roles and experiences within crack cultures is addressed through comparison of male and female experiences within crack cultures. Lastly, the issue of how race, class, and gender interact to shape the experiences of crack addicts is tentatively explored. 相似文献
60.