The influence of attention on holistic face encoding

We examined the influence of attention on the formation of holistic face representations using the composite effect (Perception 16 (1987) 747). In Experiment 1, stimuli composed of a face superimposed on a house were shown during encoding. Subjects delineated either the face or the house, thus manipulating attention away or toward the face. In Experiment 2, an intact face image was presented with letters scrolling from top to bottom. Subjects were asked to either ignore the letters or read them and decipher the words that they formed. Aligned and misaligned composites were shown at testing. Recognition performance was consistently better for misaligned than aligned stimuli, regardless of the allocation of attention during encoding. In Experiment 3, we show that the composite effect can be eliminated by a disruption in holistic processing at the time of encoding. We conclude that holistic encoding is one aspect of face analysis that occurs equally well with or without attention.     

Instructional control of generalized relational matching to sample in children.

Three experiments examined the performance of 4-year-old children in matching geometric stimuli. Performance was developed as a simulation in which all components of the behavior were overt and directly measured. A correct match depended on the state of an instructional stimulus: the background color of the display. In the first two experiments, on nonidentity trials (signified by a green background) the next longer length, larger size, or greater distance was correct. With a blue background, a comparison identical to the sample was correct. In Experiment 3, red was added for which shorter, smaller, or nearer was correct. Also here, on nonidentity trials, if a comparison of the correct length was not presented, the children adjusted their search target to the comparison of the next succeeding size (larger or smaller) so as to maintain a constant matching relation. Subsequently, when exposure to the instructional stimulus was reduced to presentation only at the beginning of each trial, performance simulated matching based on instructions about abstract relations. In all experiments, accurate matching generalized across novel stimuli and reduced exposure to the instructional stimuli.     

Generalization of delayed identity matching in retarded children.

In an extension of prior research, four retarded children were trained under an identity matching-to-sample procedure containing features previously shown to produce controlled generalization to novel stimuli. They first were taught to relate a particular handsign to the sample shape, then to maintain the handsign over a delay interval, and then to select from an array the comparison shape that permitted the handsign to be maintained (i.e., the shape identical to the sample). An initial test revealed little generalization of matching to novel stimuli, but after handsigns were trained to these stimuli, accurate generalized matching appeared immediately. The results replicated prior findings and demonstrated particular features of stimulus control sufficient to enable generalized matching. A behavioral account of relational matching was supported. The technique used in this study was shown to be effective in teaching abstract relations to nonverbal retarded children.     

Language learning impairment: Integrating research and remediation

Timing cues present in the acoustic waveform of speech provide critical information for the recognition and segmentation of the ongoing speech signal. Research has demonstrated that deficient temporal perception rates, that have been shown to specifically disrupt acoustic processing of speech, are related to specific language-based learning impairments (LLI). Temporal processing deficits correlate highly with the phonological discrimination and processing deficits of these children. Electrophysiological single cell mapping studies of sensory cortex in brains of primates have shown that neural circuitry can be remapped after specific, temporally cohesive training regimens, demonstrating the dynamic plasticity of the brain. Recently, we combined these two lines of research in a series of studies that addressed whether the temporal processing deficits seen in LLIs can be significantly modified through adaptive training aimed at reducing temporal integration thresholds. Simultaneously, we developed a computer algorithm that expanded and enhanced the brief, rapidly changing acoustic segments within ongoing speech and used this to provide intensive speech and language training exercises to these children. Results to date from two independent laboratory experiments, as well as a large national clinical efficacy trial, demonstrate that dramatic improvements in temporal integration thresholds, together with speech and language comprehension abilities of LLI children, results from training with these new computer-based training procedures.     

The effects of phonological similarity on the semantic categorisation of pictorial and lexical stimuli: evidence from continuous behavioural measures

Behavioural and neuroimaging studies provide evidence of automatic activation of phonology (e.g., covert speech) during the recognition of lexical stimuli. Implicit processing of phonological information was investigated in a kinematic study of semantic categorisation of pictures (session A) or words (session B). Participants clicked one of two items (target and distractor) based on their semantic congruency (artefact or natural) with a cued-word. Phonological similarity between cued-word and distractor was varied. The presence of the phonological distractor produced trajectories with greater curvature towards the competing semantic category than did the presence of a distractor not phonologically related. This suggests that the semantic categorisation of pictorial and lexical stimuli is influenced by the automatic activation of phonological information. Trajectories’ curvature reveals competition between partially activated phonological and semantic representations suggesting that phonological codes involved in linguistic processing influence the dynamic competition underlying the semantic categorisation of lexical and pictorial.     

工作记忆中央执行功能的特异性和可分离性

采用3种中央执行功能,对中央执行功能的特异性和可分离性进行研究。选取青年和老年被试各31名。每位被试都要参加3种中央执行功能2个难度水平的任务和瑞文标准推理测验。结果发现：记忆刷新的年龄效应不能完全由液态智力的年龄差异来解释;虽然同种执行功能内不同难度任务的年龄效应类似,但不同执行功能的年龄效应不同,从大到小依次为记忆刷新、随机生成和选择性注意;控制液态智力的影响后,同种执行功能内不同难度任务间的相关仍然显著,而不同中央执行功能之间的相关不显著;另外,本实验条件下选择性注意与液态智力相关不显著,且不存在年老化现象。研究结果表明中央执行功能相对于液态智力具有一定的特异性,并且可以进一步分离为一些相互独立的子功能。     

Effets comportementaux et cognitifs de l'engagement dans un acte préparatoire activant un élément central versus périphérique de la représentation du don d'organes

We render an account of a research programme that links two fields of study usually unconnected: the field of the freely agreed submission and the field of social representations. Two hypothesis are tested in the foot-in-the door paradigm: participants that agree to perform an initial request (to sign a petition) that selects a core element of the representation of organ donation: a) will be more inclined to agree to perform the target request (to sign a donor card); and b) will have an attitude more favourable about organ donation than participants that agree to perform an initial request that selects a peripheral element. The two experiments presented confirm these hypotheses.     

数学学习困难与工作记忆关系研究的现状与前瞻

工作记忆是一种对信息进行暂时加工和贮存的能量有限的记忆系统,在许多复杂的认知活动中起重要作用,工作记忆缺陷是造成数学学习困难的根本原因。数学学习困难儿童都存在视觉空间模板、语音回路以及中央执行器功能等方面的缺陷,工作记忆的各成分对数学困难者的影响不同。今后研究将以整体的、发展的视角,不断改进研究方法,将行为研究和神经加工机制研究相结合。     

The dynamics of informal role development within sport teams: A case study approach

AimRecent literature suggested that informal roles can naturally arise in sport teams and impact team functioning. This case study aimed to identify the key factors involved in informal role emergence in sport teams.MethodData were collected from 27 players from one male and one female intercollegiate basketball team using multiple methods. Questionnaires were administered four times during the sport season (October–February) to assess athlete personality and informal role occupancy, and a regular season game for each team was video-recorded to objectively code athletes’ behaviors. Qualitative interviews were conducted following the end of the season with coaches and athletes from one team. Role profiles were created for each athlete, which included the information regarding his/her personality, role occupancy, and behavior frequencies. The role profiles were then organized into different role categories (e.g., task vs. social specialist) based on similarities in role occupancy, and the patterns in personality and behavior frequencies were examined within and across the categories. Interview data were analyzed thematically to complement the role profiles.ResultsMembers who occupied both task- and social-oriented informal roles were more extraverted and active, and had longer tenure compared to those who occupied no informal roles. Members specializing in task-oriented roles displayed lower extraversion and varying degrees of activity, and a social specialist was more extraverted and active. Deviant members who occupied negative roles were first-year members. The interview results suggested various person-related and contextual factors that influenced informal role development.ConclusionInformal role emergence is a complex process that occurs via an interaction of multiple factors. A conceptual framework is proposed, which offers several avenues for future research to continue to investigate role dynamics in groups.