Long-lasting modifications of saccadic eye movements following adaptation induced in the double-step target paradigm

The adaptation of saccadic eye movements to environmental changes occurring throughout life is a good model of motor learning and motor memory. Numerous studies have analyzed the behavioral properties and neural substrate of oculomotor learning in short-term saccadic adaptation protocols, but to our knowledge, none have tested the persistence of the oculomotor memory. In the present study, the double-step target protocol was used in five human subjects to adaptively decrease the amplitude of reactive saccades triggered by a horizontally-stepping visual target. We tested the amplitude of visually guided saccades just before and at different times (up to 19 days) after the adaptation session. The results revealed that immediately after the adaptation session, saccade amplitude was significantly reduced by 22% on average. Although progressively recovering over days, this change in saccade gain was still statistically significant on days 1 and 5, with an average retention rate of 36% and 19%, respectively. On day 11, saccade amplitude no longer differed from the pre-adaptation value. Adaptation was more effective and more resistant to recovery for leftward saccades than for rightward ones. Lastly, modifications of saccade gain related to adaptation were accompanied by a decrease of both saccade duration and peak velocity. A control experiment indicated that all these findings were specifically related to the adaptation protocol, and further revealed that no change in the main sequence relationships could be specifically related to adaptation. We conclude that in humans, the modifications of saccade amplitude that quickly develop during a double-step target adaptation protocol can remain in memory for a much longer period of time, reflecting enduring plastic changes in the brain.     

Race and the construction of Jewish identity in French and American Jewish fiction of the 1920s

In both the United States and France, Jewish-fiction writers of the 1920s often invoked the idea of Jewish racial unity as a non-rational, uncontrollable force separating Jews from mainstream society irrespective of their desire for integration. This genre of fiction reveals an ambivalent attitude towards race-thinking. The notion that there are intractable physical differences between groups threatened the Jews status as fully privileged co-citizens. Yet a racialized self-understanding provided them with a way to articulate the intangible bonds of community, which their official status as a purely religious group normally held them back from expressing openly. The common trope of the failed Jewish-Gentile romance best expresses the dual desire of French and American Jews for acceptance and distinctiveness. A sense of racial identity often leads protagonists to reject a non-Jewish lover or spouse and draw strength from a renewed sense of connection with the Jewish people. More often than not, however, these figures are left with feelings of ambivalence and regret, as they realize that their universalist dream of uniting with someone from a different racial background is not possible in the real world, where their Jewish particularism inevitably dooms such relationships to failure.I would like to thank Hasia Diner, Laura Lee Downs and Bonnie S. Anderson for reading and commenting on previous versions of this article.     

儿童早期词汇获得的跨语言/文化研究

婴儿词汇学习是国际语言发展研究的前沿领域, 但大多数研究都是以英语婴儿为研究对象。目前国内关于汉语婴儿早期语言发展研究处于起步阶段。由于汉语在词法、句法等方面具有明显的特殊性, 另外, 成人“言语输入”的语用习惯以及非言语线索都会影响婴儿早期词汇学习, 使得不同语言文化下的婴儿呈现不同的单词学习模式。本项目力图从跨语言视角考察汉语和英语婴儿的早期单词学习(包括单词的理解和产生)以及促进婴儿语言发展的成人言语和非言语输入特征。研究将综合采用实验室实验、半结构化实验室观察和量表测量等研究方法, 利用新的研究技术(如习惯化和IPLP), 从多个角度探索婴儿词汇发展, 以及不同语言文化和个体环境对婴儿早期词汇学习的影响, 揭示词汇获得的跨语言一致性和特异性。研究结果有望对儿童的语言学习提供启示。     

Indigenous Women of the Amazon Forest: The Woman Shaman of the Yawanawa Tribe

ABSTRACT

Among the most diverse and indigenous areas of the world is Latin America, specifically the Amazon river basin and its rain forests. Indigenous tribes and indigenous healing practices from these areas have recently gained more attention and popularity. However, less is known about experiences of tribal women related to indigenous practices, including the long-standing legacy of patriarchal and Christian colonization. This contribution offers the voice of one of the few known women-shamans in the area: Hushahu of the Yawanawa tribe. This first full public interview in a Western publication provides not only a perspective on indigenous healing, but also on experiences of indigenous tribal women in light of their history of colonization and oppression.