Search in an environment with an uncertain distribution of resources involves a trade-off between exploitation of past discoveries and further exploration. This extends to information foraging, where a knowledge-seeker shifts between reading in depth and studying new domains. To study this decision-making process, we examine the reading choices made by one of the most celebrated scientists of the modern era: Charles Darwin. From the full-text of books listed in his chronologically-organized reading journals, we generate topic models to quantify his local (...) (text-to-text) and global (text-to-past) reading decisions using Kullback-Liebler Divergence, a cognitively-validated, information-theoretic measure of relative surprise. Rather than a pattern of surprise-minimization, corresponding to a pure exploitation strategy, Darwin’s behavior shifts from early exploitation to later exploration, seeking unusually high levels of cognitive surprise relative to previous eras. These shifts, detected by an unsupervised Bayesian model, correlate with major intellectual epochs of his career as identified both by qualitative scholarship and Darwin’s own self-commentary. Our methods allow us to compare his consumption of texts with their publication order. We find Darwin’s consumption more exploratory than the culture’s production, suggesting that underneath gradual societal changes are the explorations of individual synthesis and discovery. Our quantitative methods advance the study of cognitive search through a framework for testing interactions between individual and collective behavior and between short- and long-term consumption choices. This novel application of topic modeling to characterize individual reading complements widespread studies of collective scientific behavior. (shrink)

In the target article, we presented the hypothesis that parasite-stress variation was a causal factor in the variation of in-group assortative sociality, cross-nationally and across the United States, which we indexed with variables that measured different aspects of the strength of family ties and religiosity. We presented evidence supportive of our hypothesis in the form of analyses that controlled for variation in freedom, wealth resources, and wealth inequality across nations and the states of the USA. Here, we respond to criticisms (...) from commentators and attempt to clarify and expand the parasite-stress theory of sociality used to fuel our research presented in the target article. (shrink)

In contemporary culture, existing audiovisual recordings are constantly reused and repurposed for various ends, raising questions regarding the ethics of such appropriations, particularly when the recording depicts actual people and events. Every reuse of a preexisting recording is, on some level, a misuse in that it was not intended or at least anticipated by the original maker, but not all misuses are necessarily unethical. In fact, there are many instances of productive misuse that seem justified. At the same time, there (...) are other instances in which the misuse shades into abuse. Documentary scholars have long engaged with the question of the ethical responsibility of documentary makers in relation to their subjects. But what happens when this responsibility is set at a remove, when the recording already exists for the taking and repurposing? Reuse, Misuse and Abuse surveys a range of contemporary films and videos that appropriate preexisting footage and attempts to theorize their ethical implications. (shrink)

Hyperlink cinema is an emergent film genre that seeks to push the boundaries of the medium in order to mirror contemporary life in the globalized community. Films in the genre thus create an interacting network across space and time in such a way as to suggest that people’s lives can intersect on scales that would not have been possible without modern technologies of travel and communication. This allows us to test the hypothesis that new kinds of media might permit us (...) to break through the natural cognitive constraints that limit the number and quality of social relationships we can manage in the conventional face-to-face world. We used network analysis to test this hypothesis with data from 12 hyperlink films, using 10 motion pictures from a more conventional film genre as a control. We found few differences between hyperlink cinema films and the control genre, and few differences between hyperlink cinema films and either the real world or classical drama (e.g., Shakespeare’s plays). Conversation group size seems to be especially resilient to alteration. It seems that, despite many efficiency advantages, modern media are unable to circumvent the constraints imposed by our evolved psychology. (shrink)

We show how faceted search using a combination of traditional classification systems and mixed-membership topic models can go beyond keyword search to inform resource discovery, hypothesis formulation, and argument extraction for interdisciplinary research. Our test domain is the history and philosophy of scientific work on animal mind and cognition. The methods can be generalized to other research areas and ultimately support a system for semi-automatic identification of argument structures. We provide a case study for the application of the methods to (...) the problem of identifying and extracting arguments about anthropomorphism during a critical period in the development of comparative psychology. We show how a combination of classification systems and mixed-membership models trained over large digital libraries can inform resource discovery in this domain. Through a novel approach of “drill-down” topic modeling—simultaneously reducing both the size of the corpus and the unit of analysis—we are able to reduce a large collection of fulltext volumes to a much smaller set of pages within six focal volumes containing arguments of interest to historians and philosophers of comparative psychology. The volumes identified in this way did not appear among the first ten results of the keyword search in the HathiTrust digital library and the pages bear the kind of “close reading” needed to generate original interpretations that is the heart of scholarly work in the humanities. Zooming back out, we provide a way to place the books onto a map of science originally constructed from very different data and for different purposes. The multilevel approach advances understanding of the intellectual and societal contexts in which writings are interpreted. (shrink)

Van Lange et al. argue that variations in climate explain cross-societal variations in violence. We suggest that any approach seeking to understand cross-cultural variation in human behavior via an ecological framework must consider a wider array of ecological variables, and we find that income inequality and sex ratio are better predictors than climate of cross-societal variations in violence.

Institutions of higher education are today under increasing pressure tointernationalize their courses and programmes. The overall impact ofthis process is far from clear. This essay compares and contrastspatterns of Australian higher education offered to students fromdeveloping countries, with services delivered to Australian-bornstudents. We suggest that the process of globalization is contributingto uneven economic and educational development, and may weaken theover-stretched educational systems of poorer countries.

Do we really have freedom to act, or are we slaves to our genes, environment or culture? Regular TPM columnist Mathew Iredale gets to grips with one of the most intractable issues in philosophy: the problem of free will. Iredale explores what it is about the free will problem that makes it so hard to resolve and argues that the only acceptable solution to the free will problem must be one that is consistent with what science tells us (...) about the world. It is here, maintains Iredale, that too many works on free will, introductory or otherwise, fall down, by focusing only on how free will relates to determinism. Iredale shows that there are clear areas of scientific research which are directly and significantly relevant to free will in a way that does not involve determinism. Although these areas of scientific research do not allow us to solve the problem, they do allow us to separate the more plausible ideas concerning free will from the less plausible. (shrink)

Do we really have freedom to act, or are we slaves to our genes, environment or culture? Regular TPM columnist Mathew Iredale gets to grips with one of the most intractable issues in philosophy: the problem of free will. Iredale explores what it is about the free will problem that makes it so hard to resolve and argues that the only acceptable solution to the free will problem must be one that is consistent with what science tells us (...) about the world. It is here, maintains Iredale, that too many works on free will, introductory or otherwise, fall down, by focusing only on how free will relates to determinism. Iredale shows that there are clear areas of scientific research which are directly and significantly relevant to free will in a way that does not involve determinism. Although these areas of scientific research do not allow us to solve the problem, they do allow us to separate the more plausible ideas concerning free will from the less plausible. (shrink)

This is the second paper in a two-part series describing subject and family perspectives from the CENTURY-S (CENtral Thalamic Deep Brain Stimulation for the Treatment of Traumatic Brain InjURY-Safety) first-in-human invasive neurological device trial to achieve cognitive restoration in moderate to severe traumatic brain injury (msTBI). To participate, subjects were independently assessed to formally establish decision-making capacity to provide voluntary informed consent. Here, we report on post-operative interviews conducted after a successful trial of thalamic stimulation. All five msTBI subjects met (...) a pre-selected primary endpoint of at least a 10% improvement in completion time on Trail-Making-Test Part B, a marker of executive function. We describe narrative responses of subjects and family members, refracted against that success. Interviews following surgery and the stimulation trial revealed the challenge of adaptation to improvements in cognitive function and emotional regulation as well as altered (and restored) relationships and family dynamics. These improvements exposed barriers to social reintegration made relevant by recoveries once thought inconceivable. The study’s success sparked concerns about post-trial access to implanted devices, financing of device maintenance, battery replacement, and on-going care. Most subjects and families identified the need for supportive counseling to adapt to the new trajectory of their lives. (shrink)

Recently there has been a revival of interest in the theory and practice of eugenics by both academics and lay people. The ongoing revolution in biology and the increasing ability to acquire genetic information has led to concerns about genetics being used again for sinister eugenic ends. Although the goals behind traditional eugenics - the minimization of disease and the improvement of human health - remain unchanged, the means by which these goals should be achieved have altered significantly. However, in (...) debates about the impact of human genetic research, eugenics is sometimes viewed as a purely historical phenomenon and its relevance to the current situation is minimized. This article outlines the history of the eugenics movement, describes some eugenic practices, and explores why an appreciation of these historical debates is important for nurses. (shrink)