Rats’ novel object interaction as a measure of environmental familiarity

Environmental familiarization is a learning phenomenon embedded within most tasks used to study learning and motivation. Given its prevalence there is surprisingly little systematic behavioral research on factors affecting familiarization. The six experiments reported in the present report used rats’ tendency to interact more with a novel object in a familiar than in a novel environment as a measure of environmental familiarization. We found that 3 min of exposure to the environment was sufficient to increase object interaction above unfamiliar controls even when testing occurred up to 48 h after initial exposure to the environment; 1 or 1.5 min of exposure was not sufficient. Also, in the brief 2 min test, 10 min of environment exposure did not appear to increase object interaction above the 3-min condition. The 3-min of environment exposure was sufficient for familiarization whether environment exposure occurred in one 3 min placement or two 1.5 min placements. Environmental familiarization as measured by object interaction was also sensitive to ‘interference’ manipulations. That is, a distinct object present during initial exposure to the environment produced a level of object interaction in testing comparable to an unfamiliar control. Similarly, exposure to a second distinct alternate environment immediately after, but not before, initial exposure to the test environment partially disrupted environmental familiarization. In sum, object interaction might serve as a useful measure for studying processes mediating environmental familiarity.     

Second-order conditioning of human causal learning

This article provides the first demonstration of a reliable second-order conditioning (SOC) effect in human causal learning tasks. It demonstrates the human ability to infer relationships between a cause and an effect that were never paired together during training. Experiments 1a and 1b showed a clear and reliable SOC effect, while Experiments 2a and 2b demonstrated that first-order extinction did not affect SOC. These results were similar to those found in animal and human conditioning and suggested that a similar associative mechanism could explain these effects. However, they can also be used to look into the underlying causal mental model people build and store while they are learning this task. From a cognitive view, overall results suggest that an independent rather than a chain causal mental model is stored after second-order learning in human causal tasks.     

Is Educational Research Any Use?

We begin by examining the widespread scepticism about the value of empirical educational research that is found within sections of the philosophy of education community. We argue that this scepticism, in its strongest form, is incoherent as it suggests that there are no educational facts susceptible of discovery. On the other hand, if there are such facts, then commonsense is not an adequate way of accessing them, due to its own contested and variable nature. We go on to examine the claim that teaching is a moral enterprise whose successful pursuit demands the grasp of moral concepts and their implications. We show that while this is the case, it is a necessary, not a sufficient condition for successful teaching, which also requires a grasp of facts that are relevant to effective teaching and learning. Finally we examine some protocols for educational research. John Gingell, John Gingell is head of philosophy programmes at the University of Northampton, UK. He is the author, with Ed Brandon, of ‘In Defence of High Culture’ (Blackwell 2000) and (with Christopher Winch) ‘Philosophy and Education Policy: a critical introduction’ (Routledge 2004). Christopher Winch teaches at King’s College, London, UK. He is the author of ‘The Philosophy of Human Learning’ (Routledge 1998) and ‘Education, Autonomy and Critical Thinking’ (Routledge, forthcoming, 2005).     

Aggressive strategies and victimization during adolescence: grade and gender differences,and cross‐informant agreement

The purpose of this study was twofold: (1) to analyze the frequency of physical, verbal, and indirect aggression as well as victimization across two genders and grades and (2) to assess the concordance among different informants. According to the answers provided by 257 fifth and seventh graders (mean age 11.4 and 13.5, respectively) in the Peer Estimated Conflict Behavior Questionnaire, four types of ratings were calculated: same‐ and opposite‐gender rating, rating by both genders, and self‐report. Additionally, teacher ratings were collected. In contrast to earlier findings, boys were found to be directly, as well as indirectly, more aggressive than girls, thus challenging the universality of indirect aggression as a strategy more frequently employed by girls. Consistencies among different informants varied, with peers showing the strongest agreement with each other and self‐views conforming the least to other ratings.Aggr. Behav. 00:1–12, 2005. © 2005 Wiley‐Liss, Inc.     

Interactivism in artificial intelligence (AI) and intelligent robotics

This paper overviews the interactivist model of representation and its applications in artificial intelligence (AI) and intelligent robotics. Selected examples from approaches in AI and robotics are contrasted with the generic interactivist architecture in order to illustrate specific features of it. Petitagé, an artificial agent that instantiates our interactivist-expectative theory of agency and learning (IETAL), is discussed in detail from the interactivist perspective.     

ANIMALIA,HOMO, AND THE KINGDOM OF GOD

Abstract. I selectively and critically review the state of knowledge about human evolution and the place of humans vis‐à‐vis living apes, with emphasis on bipedal posture and locomotion, expansion of the brain and associated cognitive capacities, speech, tool behavior, culture, and society. I end with a personal perspective on God and Heaven.     

Path dependent preferences: The role of early experience and biased search in preference development

What is the role of early experiences in shaping preferences? What are the mechanisms by which such early encounters influence the way preferences are formed? In this research, we examine the impact of the entry position and favorability of initial (and ongoing) experiences on preference development. We predict that the starting point will heavily influence which particular region people select from initially, and favorableness of early experiences and myopic search will both limit their search to that particular region. Across four studies, we find that when the initial experiences are favorable, subjects engage in lower levels of search, experience only a narrow breadth of possible alternatives, demonstrate less ongoing experimentation, and have a reduction in the amount of preference development.     

The effect of foregone payoffs on underweighting small probability events

Foregone payoffs add information about the outcomes for alternatives that are not chosen. The present paper examines the effect of foregone payoffs on underweighting rare but possible events in repeated choice tasks. Previous studies have not demonstrated any long‐lasting effects of foregone payoffs (following repeated presentation of a task) when foregone payoffs do not add much information. The present paper highlights the conditions and the contributing factors for the occurrence of such long‐lasting effects. An experimental study compares the effect of foregone payoffs under different degrees of rarity of the negative payoff. It is demonstrated that foregone payoffs increase the selection from risky alternatives with extremely rare and highly negative outcomes, and that this effect does not diminish with repeated presentation of the task. These findings can be summarized using a surprisingly simple reinforcement‐learning model. The findings are discussed in the context of the potential long‐term effect of social learning. Copyright © 2006 John Wiley & Sons, Ltd.     

What Causes Specific Language Impairment in Children?

ABSTRACT— Specific language impairment (SLI) is diagnosed when a child's language development is deficient for no obvious reason. For many years, there was a tendency to assume that SLI was caused by factors such as poor parenting, subtle brain damage around the time of birth, or transient hearing loss. Subsequently it became clear that these factors were far less important than genes in determining risk for SLI. A quest to find "the gene for SLI" was undertaken, but it soon became apparent that no single cause could account for all cases. Furthermore, although fascinating cases of SLI caused by a single mutation have been discovered, in most children the disorder has a more complex basis, with several genetic and environmental risk factors interacting. The clearest evidence for genetic effects has come from studies that diagnosed SLI using theoretically motivated measures of underlying cognitive deficits rather than conventional clinical criteria.     

论庄子的语言怀疑论

庄子的怀疑论其实是对语言本身的怀疑。庄子并不怀疑客观世界的“真”,他只是怀疑语言表达“真”、表达“道”的有效性。《齐物论》的主旨就是对人们语言中的“是非”、“彼此”、“然否”的意义表示怀疑和否定。庄子的语言怀疑论有助于人们破除对既有话语体系的盲从与迷信,启发人们怀疑既有思想体系与常规,大胆进行创新和探索。但他根本否定语言之说的客观性和普遍意义,则又难免导致彻底的虚无主义。