Covert processing of faces in prosopagnosia is restricted to facial expressions: evidence from cross-modal bias

We present a single case study of a brain-damaged patient, AD, suffering from visual face and object agnosia, with impaired visual perception and preserved mental imagery. She is severely impaired in all aspects of overt recognition of faces as well as in covert recognition of familiar faces. She shows a complete loss of processing facial expressions in recognition as well as in matching tasks. Nevertheless, when presented with a task where face and voice expressions were presented concurrently, there was a clear impact of face expressions on her ratings of the voice. The cross-modal paradigm used here and validated previously with normal subjects (de Gelder & Vroomen, 1995, 2000), appears as a useful tool in investigating spared covert face processing in a neuropsychological perspective, especially with prosopagnosic patients. These findings are discussed against the background of different models of the covert recognition of face expressions.     

知觉经验对汉学字形知觉整体性的影响

三项实验通过部件识别法探讨了知觉经验对字形知觉整体性的影响。实验一要求三组不同发展水平的被试命名单独呈现的部件字,结果证实了本实验所用的各组部件字之间的识别难度均等和小学三年级学生的字识别技能明显不如小学六年级和大学学生。实验二使大学生在三种字度和两种字频条件下,分别进行单、双部件的命名,主要得到非字中的部件命名反应时快于假字,后者又快于真字的“字劣效应”以及在真、假字组中的“左>右”或“上>下”的“部位效应”,但未发现字频对部件命名的效应。实验三比较了三组不同年级被试的部件命名作业,发现小六和小三学生在真、假字中的部件命名反应时无明显差异,而大学生较明显,说明前者受字形整体知觉的影响比后者小。这些结果支持了字形知觉整体性随字的知觉经验增长而加强的假设,并在一个基于联结主义框架的字词识别模型中得到了较好解释。     

Effects of prior knowledge and response bias upon recognition memory for a story: Implications for children's eyewitness testimony

Abstract: The present study was designed to evaluate the integration hypothesis and the response bias hypothesis for explaining the fragility of children's eyewitness memory, by varying the plausibility of postevent information and the strength of response bias in recognition tests. Preschool children were told a story in which a boy named Ken saw a housebreaker stealing various objects and the postevent information was also incorporated into the story. The first recognition test was administered immediately following the presentation of an interpolated story, and the second recognition test was administered 10 weeks later. The results indicated that high-plausibility objects tended to be recognized as the stolen objects in the second recognition test, and that recognition accuracy was higher for a new-distractor condition than for a misleading-distractor condition. These findings were interpreted as suggesting that the memory representation of the story might be changed through the integration processes and/or rendered inaccessible in terms of the response bias.     

中学生英语词汇记忆的策略训练研究

词汇记忆在中学英语学习中有着举足轻重的地位。本研究从策略入手 ,致力于探索记忆策略训练对英语词汇学习的积极效果。研究者在综合前人的策略分类观点和参照英语词汇学习本身特点的基础上提出了五种基本策略 ,并对之作了训练研究。从训练结果可知 ,这些策略若训练充分得当 ,能大大提高学生的词汇记忆成绩。研究者还对如何在英语词汇学习中运用策略帮助记忆提出了一个粗略的模型。从该模型中 ,我们可以清晰地看到词汇记忆的整个过程 ,以及影响策略选择和使用的各种因素     

Respect Relationships in Diverse Societies

The paper aims to clarify what is both meant and entailed when the notion of respect is invoked in relation to the issues of diversity. A distinction is introduced between two types of respecting agents: the state and the citizen. The paper then distinguishes respect in relation to a commonality – in this case citizenship – from respect in relation to specific difference. The importance of respect in relation to a commonality is stressed, whilst the distinction between the state and the citizen as the respecting agent is used to raise questions about respect of difference. The latter part of the paper looks at Peter Jones’ compromise position of ‘mediated recognition,’ and suggests the possibility of ‘mediated accommodation.’ I am grateful for insightful comments and discussions with Tiziana Torresi and Geoffrey Brahm Levey, as well as Laura Valentini, Leah Bassel, Adam Swift, Stephen Cohen, Miriam Ronzoni, Kerah Gordon-Solomon, Jennifer Balint, Toby Ord, and to the useful feedback from the editors of Res Publica. I am also grateful to The Department of Politics and International Relations, University of Oxford, where part of this paper was written whilst visiting in the Department.     

Measuring individual differences in sensitivities to basic emotions in faces

The assessment of individual differences in facial expression recognition is normally required to address two major issues: (1) high agreement level (ceiling effect) and (2) differential difficulty levels across emotions. We propose a new assessment method designed to quantify individual differences in the recognition of the six basic emotions, 'sensitivities to basic emotions in faces.' We attempted to address the two major assessment issues by using morphing techniques and item response theory (IRT). We used morphing to create intermediate, mixed facial expression stimuli with various levels of recognition difficulty. Applying IRT enabled us to estimate the individual latent trait levels underlying the recognition of respective emotions (sensitivity scores), unbiased by stimulus properties that constitute difficulty. In a series of two experiments we demonstrated that the sensitivity scores successfully addressed the two major assessment issues and their concomitant individual variability. Intriguingly, correlational analyses of the sensitivity scores to different emotions produced orthogonality between happy and non-happy emotion recognition. To our knowledge, this is the first report of the independence of happiness recognition, unaffected by stimulus difficulty.     

Amygdala activation during masked presentation of emotional faces predicts conscious detection of threat-related faces

It has been argued that critical functions of the human amygdala are to modulate the moment-to-moment vigilance level and to enhance the processing and the consolidation of memories of emotionally arousing material. In this functional magnetic resonance study, pictures of human faces bearing fearful, angry, and happy expressions were presented to nine healthy volunteers using a backward masking procedure based on neutral facial expression. Activation of the left and right amygdala in response to the masked fearful faces (compared to neutral faces) was significantly correlated with the number of fearful faces detected. In addition, right but not left amygdala activation in response to the masked angry faces was significantly related to the number of angry faces detected. The present findings underscore the role of the amygdala in the detection and consolidation of memory for marginally perceptible threatening facial expression.     

The impact of value-directed remembering on the own-race bias

Learners demonstrate superior recognition of faces of their own race or ethnicity, compared to faces of other races or ethnicities; a finding termed the own-race bias. Accounts of the own-race bias differ on whether the effect reflects acquired expertise with own-race faces or enhanced motivation to individuate own-race faces. Learners have previously been motivated to demonstrate increased recall for highly important items through a value-based paradigm, in which item importance is designated using high (vs. low) point values. Learners receive point values by correctly recalling the corresponding items at test, and are given the goal of achieving a high total point score. In two experiments we examined whether a value-based paradigm can motivate learners to differentiate between other-race faces, reducing or eliminating the own-race bias. In Experiment 1, participants studied own- and other-race faces paired with high or low point values. High point values (12-point) indicated that face was highly important to learn, whereas low point values (1-point) indicated that face was less important to learn. Participants demonstrated increased recognition for high-value own-race (but not other-race) faces, suggesting that motivation alone is not enough to reduce the own-race bias. In Experiment 2, we examined whether participants could use value to enhance recognition when permitted to self-pace their study. Recognition did not differ between high-value own- and other-race faces, reducing the own-race bias. Such data suggest that motivation can influence the own-race bias when participants can control encoding.     

Bridging music and speech rhythm: Rhythmic priming and audio–motor training affect speech perception

Following findings that musical rhythmic priming enhances subsequent speech perception, we investigated whether rhythmic priming for spoken sentences can enhance phonological processing – the building blocks of speech – and whether audio–motor training enhances this effect. Participants heard a metrical prime followed by a sentence (with a matching/mismatching prosodic structure), for which they performed a phoneme detection task. Behavioural (RT) data was collected from two groups: one who received audio–motor training, and one who did not. We hypothesised that 1) phonological processing would be enhanced in matching conditions, and 2) audio–motor training with the musical rhythms would enhance this effect. Indeed, providing a matching rhythmic prime context resulted in faster phoneme detection, thus revealing a cross-domain effect of musical rhythm on phonological processing. In addition, our results indicate that rhythmic audio–motor training enhances this priming effect. These results have important implications for rhythm-based speech therapies, and suggest that metrical rhythm in music and speech may rely on shared temporal processing brain resources.     

内隐和外显记忆的发展研究

采用Buchner等人（1995）提出的加工分离范式的修正模型,对内隐和外显记忆进行分离。结果表明：内隐记忆水平随年龄的变化不大．而外显记忆水平在12岁左右达到高峰;内隐记忆与外显记忆均不具有性别差异。