The logic of the stimulus

This paper examines the contribution of stimulus processing to animal logics. In the classic functionalist S-O-R view of learning (and cognition), stimuli provide the raw material to which the organism applies its cognitive processes–its logic, which may be taxon-specific. Stimuli may contribute to the logic of the organism's response, and may do so in taxon-specific ways. Firstly, any non-trivial stimulus has an internal organization that may constrain or bias the way that the organism addresses it; since stimuli can only be defined relative to the organism's perceptual apparatus, and this apparatus is taxon-specific, such constraints or biases will often be taxon-specific. Secondly, the representation of a stimulus that the perceptual system builds, and the analysis it makes of this representation, may provide a model for the synthesis and analysis done at a more cognitive level. Such a model is plausible for evolutionary reasons: perceptual analysis was probably perfected before cognitive analysis in the evolutionary history of the vertebrates. Like stimulus-driven analysis, such perceptually modelled cognition may be taxon-specific because of the taxon-specificity of the perceptual apparatus. However, it may also be the case that different taxa are able to free themselves from the stimulus logic, and therefore apply a more abstract logic, to different extents. This thesis is defended with reference to two examples of cases where animals' cognitive logic seems to be isomorphic with perceptual logic, specifically in the case of pigeons' attention to global and local information in visual stimuli, and dogs' failure to comprehend means-end relationships in string-pulling tasks.This contribution is part of the special issue “Animal Logics” (Watanabe and Huber 2006).     

同伴压力对创意选择的影响:基于决策双参照点效应的研究*

同伴压力作为一种重要的社会环境因素会影响创意生成,但其对个体创意选择的作用及机制尚待探究。研究从决策的双参照点效应出发,使用问卷调查和行为实验方法,以18选5任务作为创意选择测评工具,分别从个体认同感与环境两方面入手考察了同伴压力对处于成年早期个体创意选择的影响作用及其机制。结果发现同伴压力认同感会促使大学生做出高实用的创意选择,冲动性在其中起调节作用,具体来说,对低冲动性个体,较高的同伴压力认同感会带来偏向高实用性的创意选择,而高冲动性则缓冲了同伴压力认同感的影响;而操纵真实同伴在场时,会促使其规避高新颖性的创意选择,而高冲动性人格同样会减少这一规避效应。     

大学生体像烦恼与恋爱压力——自尊的中介作用*

采用青少年体像烦恼量表、自尊量表和大学生恋爱压力量表对550位大学生进行调查,建立体像烦恼、自尊和恋爱压力的结构方程,考察自尊在体像烦恼和恋爱压力之间的中介作用。结果发现：（1）大学生体像烦恼、自尊和恋爱压力之间相关显著;（2）大学生体像烦恼对自尊和恋爱压力都有显著的预测作用,对自尊的预测是负向的,对恋爱压力的预测是正向的;（3）自尊在体像烦恼和恋爱压力之间起到部分中介作用（效应值为0.417）,即体像烦恼直接对恋爱压力产生影响,也可通过自尊间接影响恋爱压力。     

Functional and connectivity changes during working memory in Huntington’s disease: 18 month longitudinal data from the IMAGE-HD study

Background

This study aimed to characterize, for the first time, 18 month longitudinal changes in both functional activation and functional connectivity during working memory in premanifest Huntington’s disease (pre-HD) and symptomatic HD (symp-HD).

Methods

Functional magnetic resonance imaging (fMRI) was used to investigate longitudinal changes in neuronal activity during working memory performance via an N-BACK task (0-BACK and 1-BACK) in 27 pre-HD, 17 symp-HD, and 23 control participants. Whole-brain analysis of activation and region-of-interest analysis of functional connectivity was applied to longitudinal fMRI data collected at baseline and 18 months follow-up.

Results

Compared with controls, the pre-HD group showed significantly increased activation longitudinally during 1-BACK versus 0-BACK in the lateral and medial prefrontal, anterior cingulate, primary motor, and temporal areas cortically, and caudate and putamen subcortically. Pre-HD far from onset, compared with controls, showed further longitudinal increases in the right and left dorsolateral prefrontal cortex (DLPFC). Longitudinal increased activation in anterior cingulate and medial primary motor areas were associated with disease burden in the pre-HD group. Moreover, in pre-HD increased activation over time in primary motor and putamen regions were associated with average response time during 1-BACK performance. During 1-BACK, functional connectivity between the right DLPFC and posterior parietal, anterior cingulate, and caudate was significantly reduced over 18 months only in the pre-HD group.

Conclusions

Longitudinal reductions in connectivity over 18 months may represent an early signature of cortico-cortical and cortico-striatal functional disconnectivity in pre-HD, whereas the concomitant increased cortical and subcortical activation may reflect a compensatory response to the demands for cognitive resources required during task performance. Our findings demonstrate that functional imaging modalities have the potential to serve as sensitive methods for the assessment of cortical and subcortical responses to future treatment measures.     

Strategies in Forecasting Outcomes in Ethical Decision-Making: Identifying and Analyzing the Causes of the Problem

This study examined the role of key causal analysis strategies in forecasting and ethical decision-making. Undergraduate participants took on the role of the key actor in several ethical problems and were asked to identify and analyze the causes, forecast potential outcomes, and make a decision about each problem. Time pressure and analytic mindset were manipulated while participants worked through these problems. The results indicated that forecast quality was associated with decision ethicality, and the identification of the critical causes of the problem was associated with both higher quality forecasts and higher ethicality of decisions. Neither time pressure nor analytic mindset impacted forecasts or ethicality of decisions. Theoretical and practical implications of these findings are discussed.     

Book review

Abstract

Physical Activity & Behavioral Medicine. James f. Sallis Neville Owen Thousand Oaks, CA: Sage, 1999. 210 Pages. ISBN 0-8039-5996-6, cloth UK£33.00; ISBN 0-8039-5997-4, paper UK£15.99.     

Explosive Population Growth in Tropical Africa: Crucial Omission in Development Forecasts—Emerging Risks and Way Out

Our article draws attention to a crucial factor frequently omitted from the global development agenda, namely the explosive population growth inevitably expected in Tropical Africa in the nearest decades as a result of the region's laggardness in fertility transition. Population doubling (or even tripling) in the next decades can seriously undermine the development prospects of Tropical African countries and lead to sociopolitical destabilization or even large-scale violent conflicts with possibly global consequences. Bringing down the population growth rates (mainly through substantially reducing the fertility rates) appears to be crucial for the achievement of the 1977 “Goals for Mankind,” as well as the Millennium Development Goals, and, as we proceed to show, can be most effectively achieved through substantially increasing female secondary education, which, in turn, should be achieved by introducing compulsory secondary education and making it the first-rate development priority.     

Functional ear (a)symmetry in brainstem neural activity relevant to encoding of voice pitch: a precursor for hemispheric specialization?

Pitch processing is lateralized to the right hemisphere; linguistic pitch is further mediated by left cortical areas. This experiment investigates whether ear asymmetries vary in brainstem representation of pitch depending on linguistic status. Brainstem frequency-following responses (FFRs) were elicited by monaural stimulation of the left and right ear of 15 native speakers of Mandarin Chinese using two synthetic speech stimuli that differ in linguistic status of tone. One represented a native lexical tone (Tone 2: T2); the other, T2′, a nonnative variant in which the pitch contour was a mirror image of T2 with the same starting and ending frequencies. Two 40-ms portions of f₀ contours were selected in order to compare two regions (R1, early; R2 late) differing in pitch acceleration rate and perceptual saliency. In R2, linguistic status effects revealed that T2 exhibited a larger degree of FFR rightward ear asymmetry as reflected in f₀ amplitude relative to T2′. Relative to midline (ear asymmetry = 0), the only ear asymmetry reaching significance was that favoring left ear stimulation elicited by T2′. By left- and right-ear stimulation separately, FFRs elicited by T2 were larger than T2′ in the right ear only. Within T2′, FFRs elicited by the earlier region were larger than the later in both ears. Within T2, no significant differences in FFRS were observed between regions in either ear. Collectively, these findings support the idea that origins of cortical processing preferences for perceptually-salient portions of pitch are rooted in early, preattentive stages of processing in the brainstem.     

Looking good versus doing good: which factors take precedence when children learn about new tools?

We present two experiments exploring whether individuals would be persuaded to imitate the intentional action of an adult model whose actions suggest that the correct way to complete a task is with an inefficient tool. In Experiment 1, children ages 5–10 years and a group of adults watched an adult model reject an efficient tool in favor of one that was inefficient, but claim it was “made for” the task. Results indicated low rates of imitation of the model’s intentional choice until 9 and 10 years of age. In Experiment 2, children ages 3–11 years again watched a model reject a functional tool in favor of a nonfunctional one. This time, the demonstration took place on video. For half of the participants, the model from the video was present to offer a choice between the two tools (high-pressure condition), and for the other half, she was absent (low-pressure condition). Children also completed a social desirability questionnaire to explore relationships between imitation choices and personality. Results indicated that rates of imitation were associated with higher scores on the social desirability scale among children ages 3–7 years. Among 8- to 11-year-olds – and especially among 9- and 10-year-olds – the decision to copy the model’s intentional choice was more likely when the model was present than when she was absent. The findings reveal the contributions of age, personality, and social pressure to differences in imitation.     

A brief review on the use of functional near-infrared spectroscopy (fNIRS) for language imaging studies in human newborns and adults

Upon stimulation, real time maps of cortical hemodynamic responses can be obtained by non-invasive functional near-infrared spectroscopy (fNIRS) which measures changes in oxygenated and deoxygenated hemoglobin after positioning multiple sources and detectors over the human scalp. The current commercially available transportable fNIRS systems have a time resolution of 1-10 Hz, a depth sensitivity of about 1.5 cm, and a spatial resolution of about 1 cm. The goal of this brief review is to report infants, children and adults fNIRS language studies. Since 1998, 60 studies have been published on cortical activation in the brain’s classic language areas in children/adults as well as newborns using fNIRS instrumentations of different complexity. In addition, the basic principles of fNIRS including features, strengths, advantages, and limitations are summarized in terms that can be understood even by non specialists. Future prospects of fNIRS in the field of language processing imaging are highlighted.