Different recognition cues reveal the decision rules used for egg rejection by hosts of a variably mimetic avian brood parasite

Brood parasitism imposes several fitness costs on the host species. To reduce these costs, hosts of avian brood parasites have evolved various defenses, of which egg rejection is the most prevalent. In the face of variable host-parasite mimicry and the costs of egg discrimination itself, many hosts reject only some foreign eggs. Here, we experimentally varied the recognition cues to study the underlying cognitive mechanisms used by the Chalk-browed Mockingbird (Mimus saturninus) to reject the white immaculate eggs laid by the parasitic Shiny Cowbird (Molothrus bonariensis). Immaculate eggs are the only parasite eggs rejected by this host, as it accepts all polymorphic, spotted eggs laid by cowbirds. Using a within-breeding pair experimental design, we tested for the salience of spotting, UV reflectance, and brightness in eliciting rejection. We found that the presence of spotting significantly decreased the probability of rejection while increments in brightness significantly increased rejection frequencies. The cognitive rules underlying mockingbird rejection behavior can be explained by a decision-making model which predicts changes in the levels of rejection in direct relation to the number of relevant attributes shared between host and parasite eggs.     

Conflict between egg recognition and egg rejection decisions in common cuckoo (<Emphasis Type="Italic">Cuculus canorus</Emphasis>) hosts

Common cuckoos (Cuculus canorus) are obligate brood parasites, laying eggs into nests of small songbirds. The cuckoo hatchling evicts all eggs and young from a nest, eliminating hosts’ breeding success. Despite the consistently high costs of parasitism by common cuckoos, great reed warbler (Acrocephalus arundinaceus) hosts sometime accept and other times reject parasitic eggs. To explore the cognitive basis of this seemingly maladaptive variation in host responses, we documented differences in egg rejection rates within 1-day periods just before and during the egg-laying cycle across host nests. Hosts rejected cuckoo eggs at 28% of nests during the pre-egg-laying stage, but when cuckoos exchanged the first host egg with the parasite egg, rejections increased to 75%. Even later, when several host eggs remained in a nest after parasitism, rejection rate fell to 37.5%. Experimental parasitism with conspecific eggs on the first and second day of host laying showed a similar directional change in relative rejection rates, dropping from 35 to 0%. Mistakes in egg discrimination (ejection error and ejection cost) were observed mostly in the latter part of the laying cycle, mainly when nests contained 5–6 eggs. These correlational and experimental patterns of egg rejection support a cognitive process of egg discrimination through several shifts in hosts’ optimal acceptance thresholds of foreign eggs. The results are also consistent with the evolution of foreign egg rejection in the context of nest-sanitation (i.e. the removal of foreign objects). Our results suggest that common cuckoo hosts may recognize more eggs than they reject. This implies that the experience of the host with one or more of its own eggs in the clutch is a key factor in rejecting parasite eggs by allowing inspection and learning about their own clutch.     

Egg arrangement in avian clutches covaries with the rejection of foreign eggs

In birds, the colour, maculation, shape, and size of their eggs play critical roles in discrimination of foreign eggs in the clutch. So far, however, no study has examined the role of egg arrangement within a clutch on host rejection responses. We predicted that individual females which maintain consistent egg arrangements within their clutch would be better able to detect and reject foreign eggs than females without a consistent egg arrangement (i.e. whose eggs change positions more often across incubation). We tested this “egg arrangement hypothesis” in blackbirds (Turdus merula) and song thrush (T. philomelos). Both species are suitable candidates for research on egg rejection, because they show high inter-individual variation and individual repeatability in egg rejection responses. As predicted, using our custom-defined metrics of egg arrangement, rejecter females’ clutches showed significantly more consistent patterns in egg arrangement than acceptor females’ clutches. Only parameters related to blunt pole showed consistent differences between rejecters and acceptors. This finding makes biological sense because it is already known that song thrush use blunt pole cues to reject foreign eggs. We propose that a disturbance of the original egg arrangement pattern by the laying parasite may alert host females that maintain a consistent egg arrangement to the risk of having been parasitized. Once alerted, these hosts may shift their discrimination thresholds to be more restrictive so as to reject a foreign egg with higher probability. Future studies will benefit from experimentally testing whether these two and other parasitized rejecter host species may rely on the use of consistent egg arrangements as a component of their anti-parasitic defence mechanisms.     

Exploration of Male Attitudes on Partnerships and Sexuality with Female <Emphasis Type="Italic">BRCA1/2</Emphasis> Mutation Carriers

Women with BRCA mutations are inundated with decisions about managing cancer risks and childbearing considerations. Decisions become more complicated when women face disclosing their mutation and risk-reduction options to a romantic partner. This study identifies the concerns and perspectives of male romantic partners regarding these unique decisions. Twenty-five male participants completed an online survey posted to cancer support group message boards. Participants reported relationship changes regarding intimacy levels (n?=?9), attraction (n?=?2), and communication (n?=?22) after mutation disclosure. Participants whose partners had not undergone prophylactic mastectomy (n?=?14) reported concerns regarding sexual relations (n?=?5), post-surgical appearance (n?=?2), post-surgical attraction (n?=?5), and health/lifespan (n?=?9). Participants did not express attitude changes toward childbearing. While mutation disclosure conversations and surgical options are concerns for many BRCA mutation carriers in relationships, male partners share these concerns. Aspects of the relationship may change, but male study participants continued to support their partners. This information can benefit female BRCA mutation carriers, their current or future partners, and genetic counselors working with this particular population.     

Separate- versus <Emphasis Type="Italic">common</Emphasis>-common-cause-type derivations of the Bell inequalities

Standard derivations of the Bell inequalities assume a common-common-cause-system that is a common screener-off for all correlations and some additional assumptions concerning locality and no-conspiracy. In a recent paper (Graßhoff et al., The British Journal for the Philosophy of Science, 56, 663–680 (2005)) Bell inequalities have been derived via separate common causes assuming perfect correlations between the events. In the paper it will be shown that the assumptions of this separate-common-cause-type derivation of the Bell inequalities in the case of perfect correlations can be reduced to the assumptions of a common-common-cause-system-type derivation. However, in the case of non-perfect correlations a non-reducible separate-common-cause-type derivation of some Bell-like inequalities can be given. The violation of these Bell-like inequalities proves Szabó’s (International Journal of Theoretical Physics, 39, 911 (2004)) conjecture concerning the non-existence of a local, non-conspiratorial, separate-common-cause-model for a δ-neighborhood of perfect EPR correlations.     

Absolutely relative or relatively absolute: violations of value invariance in human decision making

Making decisions based on relative rather than absolute information processing is tied to choice optimality via the accumulation of evidence differences and to canonical neural processing via accumulation of evidence ratios. These theoretical frameworks predict invariance of decision latencies to absolute intensities that maintain differences and ratios, respectively. While information about the absolute values of the choice alternatives is not necessary for choosing the best alternative, it may nevertheless hold valuable information about the context of the decision. To test the sensitivity of human decision making to absolute values, we manipulated the intensities of brightness stimuli pairs while preserving either their differences or their ratios. Although asked to choose the brighter alternative relative to the other, participants responded faster to higher absolute values. Thus, our results provide empirical evidence for human sensitivity to task irrelevant absolute values indicating a hard-wired mechanism that precedes executive control. Computational investigations of several modelling architectures reveal two alternative accounts for this phenomenon, which combine absolute and relative processing. One account involves accumulation of differences with activation dependent processing noise and the other emerges from accumulation of absolute values subject to the temporal dynamics of lateral inhibition. The potential adaptive role of such choice mechanisms is discussed.     

The Quantificational Domain of <Emphasis Type="BoldItalic">dou</Emphasis>: An Experimental Study

Which NP does all associate with in e.g. “The pandas, the children all saw”—the pandas, the children, or both? The intuition of adult Mandarin Chinese native speakers regarding the interpretation of the adverbial quantifier dou ‘all’ remains unclear and controversial, and various incommensurate theories of domain selection have been proposed. These studies may have failed to yield clear results because they used testing materials in which the interpretation of dou is confounded with other principles of NP interpretation (e.g. zhexie xiaohai ‘these children’ is truth-functionally synonymous with ‘all these children’). To address these concerns, we present the first set of experimental studies on adult knowledge and use of syntactic constraints on the quantifier domain of dou. The results support the hypothesis that dou can take one and only one c-commanding NP as its domain, but falsify interesting theoretical accounts that assume a strict locality constraint on dou quantification.     

The effects of incubation temperature on the development of the cortical forebrain in a lizard

The embryos of egg-laying species are exposed to variable thermal regimes, which can influence not only the resultant hatchling’s morphology (e.g., size, sex) and performance (e.g., locomotor speed), but also its cognitive performance (learning ability). To clarify the proximate basis for this latter effect, we incubated eggs of the scincid lizard Bassiana duperreyi under simulated ‘hot’ and ‘cold’ natural nest temperatures to examine the effect of incubation temperature on the structure of the telencephalon region of the forebrain. Hatchlings from low-temperature incubation had larger telencephalons (both in absolute terms and relative to body size) and larger neurons in their medial cortices, whereas the medial cortices of hatchlings from high-temperature incubation had fewer neurons overall, but greater neuronal density, and more neurons in certain areas. These temperature-induced differences in B. duperreyi forebrain development are consistent with (and may explain) the disparities in learning ability between hatchlings from our two incubation treatments. The phenotypic plasticity of lizard telencephalon anatomy in response to incubation temperature presents exciting opportunities for studies on the evolutionary and developmental determinants of intelligence in vertebrates, but also offers a cautionary tale. Global climate changes, wrought by anthropogenic activities, may directly modify brain structure in reptiles.     

Genetic Testing and Post-Testing Decision Making among <Emphasis Type="Italic">BRCA</Emphasis>-Positive Mutation Women: A Psychosocial Approach

Through an analysis of an online survey of women who tested positive for the BRCA genetic mutation for breast cancer, this research uses a social constructionist and feminist standpoint lens to understand the decision-making process that leads BRCA-positive women to choose genetic testing. Additionally, this research examines how they socially construct and understand their risk for developing breast cancer, as well as which treatment options they undergo post-testing. BRCA-positive women re-frame their statistical medical risk for developing cancer and their post-testing treatment choices through a broad psychosocial context of engagement that also includes their social networks. Important psychosocial factors drive women’s medical decisions, such as individual feelings of guilt and vulnerability, and the degree of perceived social support. Women who felt guilty and fearful that they might pass the BRCA gene to their children were more likely to undergo risk reducing surgery. Women with at least one daughter and women without children were more inclined toward the risk reducing surgery compared to those with only sons. These psychosocial factors and social network engagements serve as a “nexus of decision making” that does not, for the most part, mirror the medical assessments of statistical odds for hereditary cancer development, nor the specific treatment protocols outlined by the medical establishment.     

Abstract-concept learning in Black-billed magpies (<Emphasis Type="Italic">Pica hudsonia</Emphasis>)

Abstract relational concepts depend upon relationships between stimuli (e.g., same vs. different) and transcend features of the training stimuli. Recent evidence shows that learning abstract concepts is shared across a variety species including birds. Our recent work with a highly-skilled food-storing bird, Clark’s nutcracker, revealed superior same/different abstract-concept learning compared to rhesus monkeys, capuchin monkeys, and pigeons. Here we test a more social, but less reliant on food-storing, corvid species, the Black-billed magpie (Pica hudsonia). We used the same procedures and training exemplars (eight pairs of the same rule, and 56 pairs of the different rule) as were used to test the other species. Magpies (n = 10) showed a level of abstract-concept learning that was equivalent to nutcrackers and greater than the primates and pigeons tested with these same exemplars. These findings suggest that superior initial abstract-concept learning abilities may be shared across corvids generally, rather than confined to those strongly reliant on spatial memory.     

Courage in <Emphasis Type="Italic">The Analects</Emphasis>: A genealogical survey of the confucian virtue of courage

The different meanings of “courage” in The Analects were expressed in Confucius’ remark on Zilu’s bravery. The typological analysis of courage in Mencius and Xunzi focused on the shaping of the personalities of brave persons. “Great courage” and “superior courage”, as the virtues of “great men” or “shi junzi 士君子 (intellectuals with noble characters)”, exhibit not only the uprightness of the “internal sagacity”, but also the rich implications of the “external kingship”. The prototype of these brave persons could be said to be between Zengzi’s courage and King Wen’s courage. The discussion entered a new stage of Neo-Confucianism in the Song and Ming dynasties, when admiration for “Yanzi’s great valor” became the key of various arguments. The order of “the three cardinal virtues” was also discussed because it concerned the relationship between “finished virtue” and “novice virtue”; hence, the virtue of courage became internalized as an essence of the internal virtuous life. At the turn of the 20^th century, when China was trembling under the threat of foreign powers, intellectuals remodeled the tradition of courage by redefining “Confucius’ great valor”, as Liang Qichao did in representative fashion in his book Chinese Bushido. Hu Shi’s Lun Ru 论儒 (On Ru) was no more than a repetition of Liang’s opinion. In the theoretical structures of the modern Confucians, courage is hardly given a place. As one of the three cardinal virtues, bravery is but a concept. In a contemporary society where heroes and sages exist only in history books, do we need to talk about courage? How should it be discussed? These are questions which deserve our consideration.     

Who Counts as Human? Antecedents to Androcentric Behavior

People view men as typically human, although some conditions may make this more or less likely. Language has been implicated as one factor, with masculine generic language (e.g., he used neutrally) leading to more androcentrism relative to its alternatives. However, the influence of two types of alternatives (e.g., they vs. he or she) remains unclear. The present study asked 297 male and female online participants from the United States to select typical representations of humanity from a set of White and Black male and female faces. The wording for the concept humanity was manipulated to be either a typical member of mankind, a typical human, or a typical man or woman (or woman or man). Overall, participants selected more White targets. Participants also selected more male targets, but the degree to which that was the case was affected by wording and participant’s gender. Participants, particularly male participants, in the mankind and human wording conditions were more likely to select a male target as representative, whereas in the man or woman condition, participants’ choices did not differ from chance. Thus, androcentric thinking may be more mutable than previously surmised, varying by participants’ gender and by context.     

Childhood Adversity and Children’s Academic Functioning: Roles of Parenting Stress and Neighborhood Support

Existing research has shown that adverse childhood experiences from family instability and lack of safety increase children’s risk for poor academic functioning. A recent conceptual framework, however, has emphasized the need to investigate how parenting might mediate while community context might moderate the association between childhood adversity and children’s cognitive development. In the current study, we tested the roles of parenting stress and neighborhood support in the association between cumulative childhood adversity and children’s current academic functioning. We conducted a secondary data analysis on the subsample of school-aged children (i.e., 6–17 years old; N?=?65,680) from the 2011–2012 United States National Survey of Children’s Health (NSCH). The parent provided telephone survey data on six types of adversity (e.g., parent’s divorce) that the target child experienced, parenting stress, neighborhood support, as well as the child’s academic functioning. Controlling for the child’s age, gender, ethnicity, and the parent’s education level, structural equation modeling (SEM) revealed a significant moderated mediating effect: parenting stress partially mediated the association between history of childhood adversity and children’s current academic functioning (β?=??1.760, p?<?0.001), while neighborhood support moderated the association between parenting stress (β?=?0.492, p?<?0.001) and academic functioning.     

Measuring discriminability when there are multiple sources of bias

Performance measures such as log d and d′?aim to measure stimulus discriminability independently of response bias in conditional discrimination tasks, including the yes/no signal-detection procedure. However, they assume only one dimension of bias (e.g., response color) and do not account for bias on additional dimensions (e.g., response side). Such bias reduces log d, thus violating the statistical independence of discriminability and bias measurements. We modified log d to account for side bias and reanalyzed previous side-biased data. With strong side bias, the modified log d differed enough from the standard log d to potentially alter the conclusions of an experiment. Simulations showed that the modified log d produces discriminability estimates that are more accurate and bias-independent than the standard log d calculation.     

Sources of Meaning in Life Among Chinese University Students

The current studies were designed to explore the structure of sources of meaning in life among Chinese university students. In Study 1, we content-analyzed 171 students’ answers to the question of what made their lives meaningful and derived 74 frequently mentioned ideas. Then, we composed a questionnaire based on these ideas and administered it to another sample of 523 university students in Study 2. Seven underlying dimensions were identified through exploratory factor analysis: Self-development (i.e., to accomplish one’s aspirations and actualize one’s potential), social commitment (i.e., to contribute to society and to adhere to moral principles), interpersonal relationships (i.e., relationships with family members, friends and others), secular pursuits (i.e., stable jobs, material possessions and social status), experiences in life (i.e., to experience all the joys and sorrows in life), civilization (i.e., reading, thinking, music and arts), and autonomy (i.e., to make decisions freely and take charge of one’s own life). Results are discussed in light of the philosophical influences in Chinese culture, especially those from Confucianism and Taoism.     

Eine Welt ohne Individuelle EntitÄten?

A world without individual entities? An advice to not to extract immediate ontological consequences from quantum theory. Should we assume a world without individual entities? I pledge not to extract immediate ontological consequences from quantum theory. My intention is to focus on the complexity of ontological concepts commonly associated with quantum theory. Using as an example the compatibility of EPR correlations with the existence of individual entities, it is shown that an absolute rejection of an ontological category, based on some aspects of the formalism of quantum theory, does not seem reasonable. A consequence of this argument is that the common sense view – the world is composed of individual entities – can be maintained, despite of the particularities of quantum mechanics.     

Contradictory Information: Too Much of a Good Thing

Both I and Belnap, motivated the “Belnap-Dunn 4-valued Logic” by talk of the reasoner being simply “told true” (T), and simply “told false” (F), which leaves the options of being neither “told true” nor “told false” (N), and being both “told true” and “told false” (B). Belnap motivated these notions by consideration of unstructured databases that allow for negative information as well as positive information (even when they conflict). We now experience this on a daily basis with the Web. But the 4-valued logic is deductive in nature, and its matrix is discrete: there are just four values. In this paper I investigate embedding the 4-valued logic into a context of probability. Jøsang’s Subjective Logic introduced uncertainty to allow for degrees of belief, disbelief, and uncertainty. We extend this so as to allow for two kinds of uncertainty—that in which the reasoner has too little information (ignorance) and that in which the reasoner has too much information (conflicted). Jøsang’s “Opinion Triangle” becomes an “Opinion Tetrahedron” and the 4-values can be seen as its vertices. I make/prove various observations concerning the relation of non-classical “probability” to non-classical logic.     

A prospective investigation of rumination and executive control in predicting overgeneral autobiographical memory in adolescence

The CaR-FA-X model (Williams et al., 2007), or capture and rumination (CaR), functional avoidance (FA), and impaired executive control (X), is a model of overgeneral autobiographical memory (OGM). Two mechanisms of the model, rumination and executive control, were examined in isolation and in interaction in order to investigate OGM over time. Across two time points, six months apart, a total of 149 adolescents (13–16 years) completed the minimal-instruction autobiographical memory test, a measure of executive control with both emotional and nonemotional stimuli, and measures of brooding rumination and reflective pondering. The results showed that executive control for emotional information was negatively associated with OGM, but only when reflective pondering levels were high. Therefore, in the context of higher levels of reflective pondering, greater switch costs (i.e., lower executive control) when processing emotional information predicted a decrease in OGM over time.     

The Social and Cultural Construction of <Emphasis Type="Italic">Burqa</Emphasis>: The Case of Gheshm Island in Iran

The present study attempts to describe the components, characteristics, and implications of burqa in Qeshm Island, Iran, through an ethnographic method. The sample of the study is composed of twelve burqa-wearing women who were selected by applying a purposive sampling method. The process of data collection took 1 year, and the researchers conducted observations, note-takings, photography, and interviews with the participants on the field. The findings indicated that unlike niqab in the Arab countries, burqa is not surrounded by ideology. It is a cultural product which needs to be understood based on six main themes. In this cultural context, burqa is considered to be a social construction through which women reconstruct and moderate their social status, distance themselves from imposed roles and stereotypes, distinguish themselves from others with their creativity and innovation in designing burqas, and occasionally benefit from burqas’ financial value. Considering the various implications of burqa in the Muslim world and in Iran, it is proposed that the laws pertaining to this region be legislated based on the recognized indication of burqa by ethnic and religious groups.