Discriminating the integrated orientation of line segments and its statistical efficiencies

Abstract:  We carried out two experiments to investigate both how efficiencies fluctuate due to the experimental conditions and how we determine the representative efficiency among such various efficiencies in the discrimination task of line orientations. In Experiment 1, line segments were displayed simultaneously and dispersed spatially, while in Experiment 2, line segments were displayed sequentially. In both experiments, statistical efficiencies were calculated. In Experiment 1, efficiencies initially increased as stimulus duration increased, and decreased as the number of lines increased to a point where the efficiencies remained almost stable despite additional changes of stimulus duration or number of lines. In contrast, in Experiment 2, efficiencies were stable for almost all numbers of sequentially displayed lines, except for the condition that four lines were displayed in random positions. These stable efficiencies were approximately 50% in Experiment 1 and 30–50% in Experiment 2. We suggest that these stable efficiencies are varied in the context that human and ideal observers would adopt the same strategy regardless of the experimental conditions.     

Fission and confusion.

Catholic opponents of abortion and embryonic stem cell research usually base their position on a hylomorphic account of ensoulment at fertilization. They maintain that we each started out as one-cell ensouled organisms. Critics of this position argue that it is plagued by a number of intractable problems due to fission (twinning) and fusion. We're unconvinced that such objections to early ensoulment provide any reason to doubt the coherence of the hylomorphic account. However, we do maintain that a defense of ensoulment at fertilization must deny that we're essentially organisms.     

Positive experiences of high arousal martial arts rituals are linked to identity fusion and costly pro-group actions

A cross-sectional study was conducted with 605 practitioners of Brazilian Jiu Jitsu (BJJ) to test the hypothesis that high arousal rituals promote social cohesion, primarily through identity fusion. BJJ promotion rituals are rare, highly emotional ritual events that often feature gruelling belt-whipping gauntlets. We used the variation in such experiences to examine whether more gruelling rituals were associated with identity fusion and pro-group behaviour. We found no differences between those who had undergone belt-whipping and those who had not and no evidence of a correlation between pain and social cohesion. However, across the full sample we found that positive, but not negative, affective experiences of promotional rituals were associated with identity fusion and that this mediated pro-group action. These findings provide new evidence concerning the social functions of collective rituals and highlight the importance of addressing the potentially diverging subjective experiences of painful rituals.     

Suppression history of distractor location biases attentional and oculomotor control

Past selection experience greatly affects the deployment of attention such that targets are more readily selected if their features or locations were more frequently selected in the past. Crucially, recent studies have shown similar experience-dependent effects also for salient task irrelevant stimuli: distractors exerted less interference if they appeared at a location where they were presented more often, relatively to other possible locations. Here we investigated the effects of such suppression history on the immediate behavioural correlates of attentional deployment, i.e., eye movements. Participants were to make saccadic eye movements to a target stimulus, while ignoring a highly distracting irrelevant visual onset appearing abruptly on the screen in a proportion of trials. Crucially, this irrelevant onset occurred more frequently in two locations on the visual display and our results showed that, relatively to distractors elsewhere, onsets presented at these locations became easier to ignore, giving rise to reduced oculomotor capture. Consistent with the notion that experience can alter attentional deployment towards spatial locations, these findings indicate that, through learning, the priority of high frequency locations becomes suppressed, attenuating the intrinsic saliency of distractors appearing therein. Traces left by individual events of attentional suppression decrease the processing priority of coordinates within topographic maps of the visual space.     

A note on Type S/M errors in hypothesis testing

Motivated by the recent replication and reproducibility crisis, Gelman and Carlin (2014, Perspect. Psychol. Sci., 9, 641) advocated focusing on controlling for Type S/M errors, instead of the classic Type I/II errors, when conducting hypothesis testing. In this paper, we aim to fill several theoretical gaps in the methodology proposed by Gelman and Carlin (2014, Perspect. Psychol. Sci., 9, 641). In particular, we derive the closed-form expression for the expected Type M error, and study the mathematical properties of the probability of Type S error as well as the expected Type M error, such as monotonicity. We demonstrate the advantages of our results through numerical and empirical examples.     

Prediction and classification in nonlinear data analysis: Something old,something new,something borrowed,something blue

Prediction and classification are two very active areas in modern data analysis. In this paper, prediction with nonlinear optimal scaling transformations of the variables is reviewed, and extended to the use of multiple additive components, much in the spirit of statistical learning techniques that are currently popular, among other areas, in data mining. Also, a classification/clustering method is described that is particularly suitable for analyzing attribute-value data from systems biology (genomics, proteomics, and metabolomics), and which is able to detect groups of objects that have similar values on small subsets of the attributes.This article is based on the Presidential Address Jacqueline Meulman gave on July 9, 2003 at the 68th Annual Meeting of the Psychometric Society held near Cagliari, Italy on the island of Sardinia.—Editor     

His mother-tongue: from stuttering to separation, a case history

This paper delineates the transference and countertransference experiences in the analysis of a patient whose presenting symptom and main concern was his stutter. I suggest that oral-sadistic rather than anal-sadistic hostile elements may be identified in this patient's particular stutter. I focus on its significance in terms of object relationship: my patient's struggle to 'get born', to emerge as a separate other. I argue that early symbiotic fusion needs in conflict with the need to separate produce his stutter. Speech and language are seen as the vehicle for separation and the stutter as a flight from separateness back to an illusion of fusion with mother.     

音乐训练对统计学习能力的促进作用

统计学习能力作为快速习得环境中信息规则的先决条件之一,有助于个体以较小的消耗代价适应环境。音乐训练作为一种由多个感官共同参与的强化活动,被广泛认为是有助于提升认知能力的有效手段。随着统计学习在音乐适应中核心地位的确认以及音乐训练效应的反复验证,近年来,陆续有研究在行为表现和脑机制上证实了音乐训练能够增强个体对输入信息中统计规则的敏感性、促进听觉统计学习能力的提升。然而,关于音乐训练能否促进视觉等其他模态的统计学习能力,目前还存在不一致的结果。未来研究还应对跨模态统计学习能力的音乐训练促进效应做进一步探索;也可选用新手被试进行音乐训练干预,以明确音乐训练与各模态统计学习能力增强之间的因果关系。     

转换概率和词长期待对语音统计学习的影响

语音统计学习指个体在加工人工语言过程中, 可以追踪音节间的转换概率实现切分语流、提取词(语)的过程。本研究采用2(转换概率：高转换概率、低转换概率) × 2(词长期待：两音节、三音节)的混合实验设计来考察转换概率和词长期待对语音统计学习的影响, 转换概率是被试间变量, 词长期待是被试内变量。事后检验发现, 仅在低转换概率人工语言的三音节迫选条件下, 被试没有表现出显著的学习效果。事先对比发现, 在学习低转换概率的人工语言后, 被试完成三音节迫选试次的成绩显著低于两音节迫选试次; 在三音节迫选试次中, 学习低转换概率人工语言被试的成绩也显著低于学习高转换概率被试的成绩。以上结果说明, 转换概率和词长期待共同影响个体语音统计学习的效果。