Developmental origins of sociality in brown-headed cowbirds (Molothrus ater)

Five variables were studied relating to the emergence of sociality in hand-reared cowbirds (Molothrus ater): proximity, sex assortment, reactions to adults, head-down displays, and vocalizations. The authors were especially interested in female sociality because adult female birds influence male courtship, song content, and use through proximity, attention, and displays. The authors found that young female birds failed to show same-sex affiliation typical of the species at any point in the study. Brief introduction of adults did not affect social patterns. Adults used more head-down displays than juveniles, who used more displays with familiar peers. Directed and undirected singing emerged concurrently; directed singing was positively correlated with earlier hatching. This is the first demonstration of the need for early learning in the development of female sociality.     

Discrimination between host songs by brood parasitic brown-headed cowbirds ( Molothrus ater)

Songbirds can learn both to produce and to discriminate between different classes of acoustic stimuli. Varying levels of auditory discrimination may improve the fitness of individuals in certain ecological and social contexts and, thus, selection is expected to mold the cognitive abilities of different species according to the potential benefits of acoustic processing. Although fine-scale auditory discrimination of conspecific songs and calls has been frequently reported for brood parasitic brown-headed cowbirds (Molothrus ater), it remains unclear why and how they perceive differently the songs of their many host species. Using habituation-dishabituation paradigms and measuring behavioral and physiological (heart-rate) responses, we found that captive female cowbirds consistently discriminated between songs of two host species, the song sparrow (Melospiza melodia) and the red-winged blackbird (Agelaius phoeniceus). Playback experiments with stimuli composed of con-specific followed by heterospecific vocalizations in the field also demonstrated discrimination between these heterospecific songs even though cowbirds were not attracted to playbacks of either host species' songs alone. Our results do not directly support a nest-searching function of heterospecific song discrimination by cowbirds and are most consistent with a function of the parasites' avoidance of attacks by their agressive hosts. These data demonstrate discrimination between heterospecific vocalizations by brown-headed cowbirds and add a novel dimension to the already expansive auditory perceptual abilities of brood parasitic species and other songbirds. Electronic Publication     

Constructing culture in cowbirds (Molothrus ater)

In past work, the authors produced divergent patterns of courtship and communication in juvenile male cowbirds (Molothrus ater) by providing them with different social experiences during their 1st year. Here the authors determined whether these different social patterns could be transmitted to new generations of juvenile males. In Experiment 1, the authors exposed groups of juveniles to adult males who differed in the amount of male-male competition they produced. In Experiment 2, they gave groups of juveniles either social access to adult males or only visual and acoustic access to those males. In both experiments, juvenile males developed patterns of courtship and competition similar to those expressed by the adult males with whom they had social contact. The juveniles never had the opportunity to observe some of the adults' behaviors that they came to replicate. This suggests that the role of the adults was to establish the social structure in the groups, modifying juveniles' early social interactions. Juveniles were then "cultured" within these different learning environments, constructing social behavior similar to the adult males' behavior in their 1st year.     

Self-referent phenotype matching in a brood parasite: the armpit effect in brown-headed cowbirds (Molothrus ater)

Most birds and mammals learn characteristics of conspecifics from their parents and siblings. In interspecific brood parasites, however, early social learning could lead to species recognition errors because young are reared among heterospecifics. Conceivably, juvenile parasites might inspect and memorize aspects of their own phenotype, and later match features of encountered individuals to that template. We tested for such self-referent phenotype matching by manipulating feather colors of hand-reared fledglings (n = 21) of the parasitic brown-headed cowbird (Molothrus ater). In simultaneous choice trials (n = 6 trials/subject) between dyed and normal-colored adult females, juvenile cowbirds (< 2 months old) approached more quickly and associated preferentially with individuals that were colored similar to themselves. These preferences remained even when differences between the associative behaviors of juvenile males and females were controlled statistically. Our data imply that cowbirds incorporate their own plumage color into their recognition template. This provides the first evidence of self-referent phenotype matching through experimental manipulation of a recognition cue. Received: 11 April 2000 / Accepted after revision: 2 September 2000     

Song repertoire development in male cowbirds (Molothrus ater): its relation to female assessment of song potency

Two studies were conducted to investigate the relation between the male cowbird's (Molothrus ater ater) development of a song repertoire and the female cowbird's assessment of song potency. Male development was assayed by vocal copying and female assessment by copulatory responsiveness to song playback. The results demonstrate that males do not copy most often the particular songs that females respond to most often. Whereas rank orderings of potency were highly correlated across two independent samples of playback females, male and female rank orderings were not significantly correlated. The data highlight the potential significance of social interactions between and across the sexes for repertoire development.     

Cultural transmission of vocal traditions in cowbirds (Molothrus ater) influences courtship patterns and mate preferences.

In this study, the authors tested the cultural transmission of vocal traditions in cowbirds (Molothrus ater). Young cowbirds from a South Dakota (SD) population were housed over winter with adults of the SD population or with adults from an Indiana (IN) population. Song differences between the original SD and IN adult models were acquired by South Dakota culture (SDC) and Indiana culture (INC) males, respectively, and were transmitted to a 2nd cultural generation of birds. During playback tests of SDC and INC songs, SD females gave more copulatory responses to SDC songs. Finally, males with SD-like songs courted SDC females preferentially in breeding season tests, whereas males with IN-like songs courted INC females preferentially. These results indicate that the transmission of vocal traditions plays a fundamental role in the courtship patterns and mating decisions of cowbirds.     

Lower begging responsiveness of host versus parasitic brown-headed cowbird (Molothrus ater) nestlings is related to species identity but not to early social experience

The survival of young brood parasites depends critically on their many adaptations to exploit hosts. Parasitic survival is particularly related to competitive superiorty for foster parental care whenever host young are not destroyed in parasitized nests.Brown-headed cowbirds (Molothrus ater) are generalist obligate parasites whose early social environments are unpredictable regarding host species and numbers of nestmates. Young avian brood parasites typically beg more intensively and loudly than foster siblings, but an untested prediction is that young parasites are also more likely to respond by begging to a wider variety of stimulus types. Avian vocalizations were used in a playback experiment to stimulate begging behavior in cowbird hosts. Compared with age-matched cowbird nestlings, hosts begged less frequently to acoustic stimuli, and lower begging responsiveness was irrespective of whether hosts had been reared in parasitized nests.     

Effects of noise on pure-tone thresholds in blackbirds (Agelaius phoeniceus and Molothrus ater) and pigeons (Columba livia)

Blackbirds and pigeons were trained to detect tones in quiet and in broadband noise by using positive-reinforcement techniques. In Experiment 1, thresholds in noise were obtained in blackbirds as a function of both tone frequency and noise intensity for a pulsed noise masker (noise gated on and off with tone). For blackbirds, critical ratios (the ratio of the power of the just-detectable tone in noise to the power of the noise masker) obtained in pulsed noise showed no consistent relation to tone frequency. For pigeons, on the other hand, critical ratios obtained in continuous noise increased by about 3 dB/octave across their range of hearing, being similar to known critical ratio functions for cats and humans. In Experiment 2, critical ratios in blackbirds obtained with both continuous noise and pulsed noise were compared. Blackbird critical ratios were more stable in continuous noise and averaged 4 dB lower than critical ratios in pulsed noise. The blackbird critical ratio function obtained with continuous noise was similar to the known critical ratio function of another avian species, the parakeet. Thus, small birds appear to have atypical critical ratio functions, compared with pigeons and other vertebrates.     

Modes of perceiving and processing information in birdsong (Agelaius phoeniceus, Molothrus ater, and Homo sapiens)

In a previous study I examined the abilities of red-winged blackbirds and brown-headed cowbirds trained with a go-right/go-left procedure to identify conspecific and alien song themes (Sinnott, 1980). Results showed that each bird species exhibited superior identification of conspecific final "trill" or "whistle" elements, relative to the alien species. The present study extends these results by examining human perception of these same song stimuli, by examining the effects of tutoring birds with alien final song elements, and by using latency analyses to investigate processing modes that are not apparent from analyses of percent-correct scores. Results suggest three different processing modes: First, humans attend primarily to the final song elements. Second, birds identifying alien songs attend primarily to the introductory elements and disregard information in the final elements. Third, birds identifying conspecific songs process both the initial and final elements, but their response latencies indicate that they direct their attention primarily to the initial elements and process the final elements without investing more time than do the alien birds that fixate on the initial elements. Conspecific special processing is discussed in relation to various psychophysical, ethological, and psycholinguistic frameworks. Human perception of birdsong is discussed in relation to backward recognition masking.     

Causal learning is collaborative: Examining explanation and exploration in social contexts

Causal learning in childhood is a dynamic and collaborative process of explanation and exploration within complex physical and social environments. Understanding how children learn causal knowledge requires examining how they update beliefs about the world given novel information and studying the processes by which children learn in collaboration with caregivers, educators, and peers. The objective of this article is to review evidence for how children learn causal knowledge by explaining and exploring in collaboration with others. We review three examples of causal learning in social contexts, which elucidate how interaction with others influences causal learning. First, we consider children’s explanation-seeking behaviors in the form of “why” questions. Second, we examine parents’ elaboration of meaning about causal relations. Finally, we consider parents’ interactive styles with children during free play, which constrains how children explore. We propose that the best way to understand children’s causal learning in social context is to combine results from laboratory and natural interactive informal learning environments.     

To be(long) or not to be(long): social identification in organizational contexts

In the past few years, ideas of Social Identity Theory and Self-Categorization Theory have been successfully applied to the organizational domain. In this article, the authors provide an overview of these recent developments and present a concept of social identification in organizational contexts, based on these theories. The assumptions of this framework are that (a) social identification in organizational contexts is a multifaceted concept consisting of different dimensions and foci (or targets), (b) higher levels of identification are related to higher productivity and more positive work-related attitudes, and (c) identification is a very flexible concept that is linked to the situational context. The authors present the results of a series of field and laboratory studies in which the proposed relationships are analyzed and, in the main, confirmed.     

Patterns of social preference across different social contexts in golden lion tamarins (Leontopithecus rosalia)

We investigated the role of mutual and circumstantial factors in maintaining exclusive social relationships in a New World primate. Four breeding pairs of golden lion tamarins (Leontopithecus rosalia rosalia) were allowed to interact with their mate or an unfamiliar, opposite-sex adult in each of 4 different social contexts: in view of the mate, out of the mate's view, with only the mate present, and with only the unfamiliar animal present. Males and females were in proximity to, approached, and sniffed their mates significantly more often than they did unfamiliar tamarins. These behaviors suggest a preference for the familiar mate. However, when mates were absent, tamarins demonstrated significantly higher levels of approach and sniffs toward unfamiliar animals. These patterns of behavior indicate that circumstantial factors, such as social context, may regulate social interactions between paired tamarins and unfamiliar, opposite-sex conspecifics.     

Global environmental policy in social contexts: The case of China

In the last few years, China has taken steps to respond to the international trend to protect the global environment, especially with respect to global warming issues. This is primarily because China has now become the largest coal producer in the world. The emissions of carbon dioxide in China caused by fossil fuel burning are enormous. This factor has attracted growing, worldwide attention. Moreover, the low energy efficiency in production and consumption process has generated concern about how to keep the enrgy sector development in harmony with the environment. In addition, natural disasters, particularly the 1991 flood (the worst since the 1940s), has driven the government to reorient its national security in the broader international context. He also holds a research position at the Institute of Social Science, Danish Technical University, Denmark. He is now completing his Ph.D. work at the Institute of Economics and Planning, Roskilde University Center, Denmark. His research interest focuses on global environmental policy issues.     

The influence of diverse interaction contexts on students' sociometric status

Despite there being numerous studies on sociometric status, research that analyzes this variable from a contextualized viewpoint taking into account the different school settings in which a pupil establishes relationships is rare. The aim of this study is to analyze the stability of sociometric status in different school settings. For this purpose, 522 students filled in a sociometric questionnaire that investigated two different settings: the academic setting, which refers to the formal classroom setting; and the leisure setting, which investigates a more informal and playful setting like the playground. The main results indicate that identification percentages are almost the same in both settings. Nonetheless, all sociometric types are contextually dependent, and some are more dependent than others. Thus, rejection is observed as being the most independent of context, whereas the most dependent is that of controversial pupils. Differential analyses show that sex modifies the results obtained. It is shown that, excluding a few exceptions, combinations of sociometric types in both settings investigated can be made. These results are discussed in connection with the methodology used to identify sociometric types and their practical implication for better school adjustment.     

Hierarchy in the mind: The predictive power of social dominance orientation across social contexts and domains

The question of whether social dominance orientation represents a generalized orientation towards group-based hierarchies continues to arouse heated debate. Some researchers maintain that rather than indexing support for hierarchy across a variety of situations and social contexts, social dominance orientation scores simply reflect individuals' attitudes towards whatever specific context individuals had in mind while completing the scale. We systematically examine the generality of SDO by investigating its pattern of relationships with a very wide range of variables across a variety of disparate contexts, exploring inequality both as an ideal and as manifested in specific policies towards particular groups. We also experimentally test an important question raised by Sibley and Liu (2010) about whether administration of modified instructions to think only of “groups in general” is required to ensure SDO's generality. Evidence that SDO functions as a generalized orientation only when administered with instructions to think of groups in general would be a cause for much concern among the many researchers who have used the unmodified scale to index such an orientation. As expected, our results are clear in suggesting (a) that SDO represents a generalized orientation towards group-based hierarchy, and (b) that this property is not dependent on specific instructions to participants to think only of groups in general. Theoretical and practical implications for the status of SDO are discussed.     

The aha effect in groups and other dynamic learning contexts

The aha effect is a memory advantage for initially ambiguous stimuli (e.g., "The notes were sour because the seam split.") that are subsequently resolved ("Bagpipe") over stimuli that are comprehensible from the outset (see P M. Auble, J. J. Franks, & S. A. Soraci, 1979; T. W. Wills, S. A. Soraci, R. A. Chechile, & H. A. Taylor, 2000). The authors examined the influence of learning context on the aha effect by manipulating whether generative tasks were completed in a group setting or alone. In Experiment 1, participants in a group context either discussed difficult aha sentences, or overheard the discussion. In Experiments 2 and 3, lone participants were exposed to the sentences, and either spoke their thoughts aloud or thought silently. Participants in a group context did, as predicted, exhibit the aha global deletion of quotation marks effect. Moreover, in all experiments an aha effect was found for the active, speaking condition only. The authors discuss implications for generative learning and collaborative discourse processes.     

The Honey Trap: the social and cognitive adequacy of language in educational contexts

ABSTRACT The attack on bidialectal approaches to the teaching of writing mounted by John Honey in The Language Trap is examined and critically discussed. It is argued that Honey confuses the issues of the social and the cognitive adequacy of a particular variety of language. In particular, his critique of bidialectalism, in so far as it is based on a version of verbal deficit theory and/or cognitive relativism, is misconceived. There are valid criticisms to be made of the bidialectal approach, but they centre on the social rather than the cognitive adequacy of different varieties of language. When the critique is formulated in this way, it is more enlightening and less misleading.     

The four elementary forms of sociality: framework for a unified theory of social relations.

The motivation, planning, production, comprehension, coordination, and evaluation of human social life may be based largely on combinations of 4 psychological models. In communal sharing, people treat all members of a category as equivalent. In authority ranking, people attend to their positions in a linear ordering. In equality matching, people keep track of the imbalances among them. In market pricing, people orient to ratio values. Cultures use different rules to implement the 4 models. In addition to an array of inductive evidence from many cultures and approaches, the theory has been supported by ethnographic field work and 19 experimental studies using 7 different methods testing 6 different cognitive predictions on a wide range of subjects from 5 cultures.