Reply to Farine and Aplin: Chimpanzees choose their association and interaction partners

Farine and Aplin (1) question the validity of our study reporting group-specific social dynamics in chimpanzees (2). As alternative to our approach, Farine and Aplin advance a “prenetwork permutation” methodology that tests against random assortment (3). We appreciate Farine and Aplin’s interest and applied their suggested approaches to our data. The new analyses revealed highly similar results to those of our initial approach. We further dispel Farine and Aplin’s critique by outlining its incompatibility to our study system, methodology, and analysis.First, when we apply the suggested prenetwork permutation to our proximity dataset, we again find significant population-level differences in association rates, while controlling for population size [as derived from Farine and Aplin’s script (4); original result, P < 0.0001; results including prenetwork permutation, P < 0.0001]. Furthermore, when we … ↵1To whom correspondence may be addressed. Email: ejcvanleeuwen{at}gmail.com

INCONSISTENCIES IN PUBLIC UTILITY DEPRECIATION: DEDUCTION OF DEPRECIATION FOR RATE BASE PURPOSES

When considering depreciation for rate base purposes the courts and the commissions speak of accrued depreciation, existing depreciation, actual depreciation, complete depreciation, realized depreciation, incomplete depreciation, and observed depreciation. Accrued, existing and actual depreciation all have the same meaning

Scaling techniques for modeling directional knowledge

A common way for researchers to model or graphically portray spatial knowledge of a large environment is by applying multidimensional scaling (MDS) to a set of pairwise distance estimations. We introduce two MDS-like techniques that incorporate people’s knowledge of directions instead of (or in addition to) their knowledge of distances. Maps of a familiar environment derived from these procedures were more accurate and were rated by participants as being more accurate than those derived from nonmetric MDS. By incorporating people’s relatively accurate knowledge of directions, these methods offer spatial cognition researchers and behavioral geographers a sharper analytical tool than MDS for studying cognitive maps

INCONSISTENCIES IN PUBLIC UTILITY DEPRECIATION

Depreciation is a matter of valuation and of the determination of the cost of rendering public service. It is only incidentally related to replacements, and accounting for depreciation will not necessarily provide for replacements. Since depreciation does have to do primarily with valuation and determination of the cost of rendering service, and since capital devoted to public utility use is subject to regulation, it would seem that consistency in principles is not only desirable but attainable. It is the purpose of this article to examine the cases decided by the courts and by the regulatory commissions of the various jurisdictions to determine the manner in which this consistency may be achieved

Conformity to peer pressure in preschool children

Both adults and adolescents often conform their behavior and opinions to peer groups, even when they themselves know better. The current study investigated this phenomenon in 24 groups of 4 children between 4;2 and 4;9 years of age. Children often made their judgments conform to those of 3 peers, who had made obviously erroneous but unanimous public judgments right before them. A follow-up study with 18 groups of 4 children between 4;0 and 4;6 years of age revealed that children did not change their “real” judgment of the situation, but only their public expression of it. Preschool children are subject to peer pressure, indicating sensitivity to peers as a primary social reference group already during the preschool years

The importance of comparative psychology for developmental science [Review Article]

The aim of this essay is to elucidate the relevance of cross-species comparisons for the investigation of human behavior and its development. The focus is on the comparison of human children and another group of primates, the non-human great apes, with special attention to their cognitive skills. Integrating a comparative and developmental perspective, we argue, can provide additional answers to central and elusive questions about human behavior in general and its development in particular: What are the heritable predispositions of the human mind? What cognitive traits are uniquely human? In this sense, Developmental Science would benefit from results of Comparative Psychology

Continuous animal exposure to dichloromethane

Continuous exposures of dogs, monkeys, rats and mice to 5000 ppm and 1000 ppm of dichloromethane vapor (CH2Cl2) produced severe toxic effects on dogs, rats and mice. Dogs died after 3 weeks exposure to 1000 ppm and after 6 weeks exposure to 5000 ppm. Thirty percent of the mice also succumbed during four weeks exposure to 5000 ppm CH2Cl2. Although rats survived 14 weeks exposure to 5000 ppm, they experienced subnormal weight gains. Significant gross and histopathological hepatic lesions were noted in all 3 species at death or experimental termination in 14 weeks. In addition, rats showed abnormal kidney histopathology. Fat stains disclosed mild fatty increase in monkey livers after 14 weeks exposure to 1000 ppm CH2Cl2

Effect of 90-day continuous exposure to methylisobutylketone on dogs, monkeys and rats

Continuous exposure of rats, dogs and monkeys to 410 mg/cu M methylisobutylketone vapor (MIBK) was conducted to evaluate the provisional spacecraft exposure limit of 20 ppm established by the Space Science Board in 1968. The exposure, conducted in a simulated space cabin environment, did not produce any measurable changes in dogs or monkeys. Rats developed hyaline droplet nephrosis within 2 weeks of exposure which was reversible upon removal from the MIBK even after 90 days. The data obtained indicated that the 60-minute emergency exposure limit of 100 ppm and the 90- and 1000-day provisional limits as established by the Space Science Board contain a wide margin of safety

Developing a coding system for sulking behavior in young children

Children’s sulking behavior is a salient yet understudied emotional phenomenon. It has been hypothesized to result from hurt feelings, humiliation, and anger, and might thus function as a nonverbal measure in the behavioral studies of these emotions. We conducted three studies that served to develop a comprehensive coding system for children’s sulking behavior. The first study explored sulking features in an online survey that used parental and teacher reports. In an event-based parental diary study, we reevaluated the importance of each feature based on its frequency across episodes of sulking behavior and analyzed the time course of sulking episodes. Finally, we analyzed YouTube videos and demonstrated that the coding system could be reliably applied. We also determined a minimal number of necessary features as a classification threshold. The resulting coding system includes the following features: becoming silent, distancing, turning away, gaze avoidance, crossing arms, lowering head, pouting lips, lowered eyebrows, and, probably, utterances of illegitimate devaluation, and relational distancing. Thus, all varieties of sulking seem to have withdrawal from an ongoing interaction in common