Water Mist Punishment for Two Classes of Problem Behaviour

A study with multiple baseline design across situations and response-classes was used to evaluate the effects of a water mist procedure used for punishment of two classes of problem behaviour in a 50-year-old woman with severe mental retardation. Problem behaviour was reduced to less than 5% of baseline. After 19 months the problem behaviour was still reduced, and had stabilized at a level below 10% of baseline. Due to financial economies the local community authorities terminated the treatment, which resulted in a marked increase in the rate of problem behaviour.     

Demonstrating and eliminating the aggregation effect in physical skill tasks

Confidence judgments can be elicited in multiple ways. One of these procedures is to provide confidence judgments regarding each of a number of cases (individual judgments). A second procedure is to provide confidence judgments about a set of items (an aggregate judgment). Much research has demonstrated an aggregation effect—that individual judgments are more confident than aggregate judgments—within the cognitive knowledge domain. However, this effect has not previously been investigated with physical performance skill tasks. In three experiments, participants gave individual and aggregate judgments regarding the number of successful tosses they would make in either a ring toss, ping‐pong toss, or basketball toss task. In keeping with the aggregation effect, individual judgments were more confident than were aggregate judgments of success. Additionally, we eliminated the aggregation effect in Experiments 2 and 3 by employing a case‐specific base rate manipulation. Consistent with previous research with cognitive tasks, these results suggest that individual confidence judgments for physical skill tasks are determined primarily by characteristics associated with the individual case to be judged, whereas aggregate confidence judgments are determined by a more general evaluation of one's ability in the domain. Copyright © 2009 John Wiley & Sons, Ltd.     

The similarity heuristic

Decision makers often make snap judgments using fast‐and‐frugal decision rules called cognitive heuristics. Research into cognitive heuristics has been divided into two camps. One camp has emphasized the limitations and biases produced by the heuristics; another has focused on the accuracy of heuristics and their ecological validity. In this paper we investigate a heuristic proposed by the first camp, using the methods of the second. We investigate a subset of the representativeness heuristic we call the “similarity” heuristic, whereby decision makers who use it judge the likelihood that an instance is a member of one category rather than another by the degree to which it is similar to others in that category. We provide a mathematical model of the heuristic and test it experimentally in a trinomial environment. In this environment, the similarity heuristic turns out to be a reliable and accurate choice rule and both choice and response time data suggest it is also how choices are made. We conclude with a theoretical discussion of how our work fits in the broader “fast‐and‐frugal” heuristics program, and of the boundary conditions for the similarity heuristic. Copyright © 2009 John Wiley & Sons, Ltd.     

Ingroup,Outgroup, and Global-Human Identities of Turkish-Armenians

Abstract

This study was an examination of the ingroup (Armenian), outgroup (Turkish), and global-human identities of Turkish-Armenians, a relatively inaccessible and politically sensitive minority in Turkey. Age, gender, nature and level of education, and involvement in Armenian ethnic organizations were explored as covariates of the three social identities. A convenience sample of 70 Turkish-Armenians participated in the study. A questionnaire was administered in Turkish. The results showed that men, older Armenians, and those who attended Armenian schools scored higher on ingroup (Armenian) identity than did women, younger Armenians, and those who attended Turkish schools, respectively. The younger generation and those who attended Turkish schools scored higher on outgroup (Turkish) identity, indicating possible acculturation, as well as on global-human identity, indicating a move away from parochialism. Ingroup and outgroup identities tended to be negatively related, showing some polarity. Global-human identity was positively correlated with the majority Turkish identity and negatively with Armenian ethnic identity.     

The impact of the home musical environment on infants’ language development

There is strong evidence that musical engagement influences children’s language development but little research has been carried out on the relationship between the home musical environment and language development in infancy. The current study assessed musical exposure at home (including parental singing) and language development in 64 infants (8.5–18 months). Results showed that the home musical environment significantly predicted gesture development. For a subgroup of infants’ below 12 months, both parental singing and overall home musical environment score significantly predicted word comprehension. These findings represent the first demonstration that an enriched musical environment in infancy can promote development of communication skills.     

The relationship between anomalistic belief,misperception of chance and the base rate fallacy

Abstract

A poor understanding of probability may lead people to misinterpret every day coincidences and form anomalistic (e.g., paranormal) beliefs. We investigated the relationship between anomalistic belief (including type of belief) and misperception of chance and the base rate fallacy across both anomalistic and control (i.e., neutral) contexts. Greater anomalistic belief was associated with poorer performance for both types of items; however there were no significant interactions between belief and context. For misperception of chance items, only experiential (vs. theoretical) anomalistic beliefs predicted more errors. In contrast, overall anomalistic belief was positively related to the base rate fallacy but no specific subtype of anomalistic belief was a significant predictor. The results indicate misperception of chance may lead people to interpret coincidental events as having an anomalistic cause, and a poor understanding of base rates may make people more prone to forming anomalistic beliefs.