Functional recovery following brain damage: conceptual frameworks and biological mechanisms

Mammals are well known to manifest recovery over time of many functional impairments induced by brain lesions. A brief reveiw is provided of the different conceptual frameworks within which functional recovery has been examined in the literature, and of different neurobiological mechanisms that have been proposed to account for the phenomenon. We observe that these two levels of analysis have frequently been only loosely related. Finally, a newly identified biological mechanism—compensatory collateral sprouting—is described which appears to be closely related to functional recovery in animals with hippocampal lesions, and this is proposed as a powerful new model within which to investigate further the relationship between the phenomenon of functional recovery and its underlying mechanisms.     

Feeling time in nature: The influence of directed and undirected attention on time awareness

In the present study, we examined the impact of the interaction of environmental and task-induced attentional focus on time perception, specifically awareness of the time flow. We tested 48 participants in either a natural or urban setting over three 25- to 35-min sessions. We manipulated the within-subjects factor task by means of two tasks—one requiring directed attention on the task itself, the other undirected attention on the environment—alongside a control condition with no specific task. We measured time awareness, passage of time judgments, felt time judgments, and estimated time as dependent variables. For time awareness, we found an interaction between environment and task: in the natural environment, only a task requiring directed attention reduced time awareness; whereas, in the urban environment, both tasks reduced time awareness compared to the control condition. The results suggest that natural environments increase time awareness unless we focus our attention on a task.     

Correction to: Effects of reward magnitude and training frequency on the learning rates and memory retention of the Port Jackson shark Heterodontus portusjacksoni

Animal Cognition - In the original publication of the article, the Fig. 4 was erroneously published.     

目的、意向和意识

本文提出了一个意向性目标搜寻的计算机模型,它有两个部分,静态部分包括一个目标表征和到达这个目标的程序。动态部分是一个感觉输入、中间信息加工,行为输出的重复的反馈循环。人类意向必然伴有意识,但机器人则可能无意识而有意向。 利用目标搜寻系统机器人模型,我们对目标搜寻系统的目的连续统下了定义;这个连续统从简单的直接反应系统一直到意向性系统。对这个目的连续统有两种传统的解释:一是柏拉图、亚里士多德和普罗提诺的终极原因理论,二是希腊原子论者和现代进化生物学家的还原主义学说。本文评价了这些学说。 本文考察了几种类型的意识机能,提出了以自动机为依据的意识理论,比较了人类和计算机。从计算机结构的角度来看,人类意识是一类特殊的计算机控制系统。     

Incontinentia pigmenti as the leading symptom

It is reported on four girls aged 8 to 20 with Incontinentia pigmenti (Ip) The ectodermal dysplasia was associated with oligophrenia, therapy resistant epilepsy with severe psychorganic syndromes and dementia, Lennox syndrome, lability of emotion with severe disorders of social adaptations, spasticity, hypo- and areflexia, hemiathetosis, choreiform unrest, pathological EEG findings, including spike-potentials; relations to cleidocranial dysostosis, dysraphia, Poland's, Greig's and Chotzen's syndrome were found. Ip means unfavourable prognosis and progression of neuropsychiatric disorders.     

Psychological correlates of salivary cortisol secretion among unemployed men and women

The aim of the present study was to examine the association between psychological factors and salivary cortisol secretion (baseline level, reactivity to laboratory stressors) in a sample of 59 long-term unemployed men and women (mean age 42±10 years). Subjects were divided into four groups according to their basal levels of salivary cortisol as well as their reactivity to experimental stress (stress level minus baseline): (1) low base/low reactivity; (2) high base/low reactivity; (3) low base/high reactivity; and (4) high base/high reactivity. The low base/low reactivity group was characterized by significantly higher somatic anxiety, muscular tension, irritability, and depression (Beck’s Depression Inventory) and lower perceived control (mastery) than the other groups. The low base/high reactivity group was also characterized by depression and low perceived control. The high base/low reactivity group was higher in terms of monotony avoidance, Type-A behavior (JAS) and mastery, but lower in depression. The results indicate that (1) individuals with personality traits reflecting emotional distress are more vulnerable to exhaustion of the HPA-axis following long-term unemployment and (2) monotony avoidance and Type-A behavior, at least temporarily, seem to exert a beneficial influence on mental well-being among long-term unemployed individuals.