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Investigators in the cognitive neurosciences have turned to Big Data to address persistent replication and reliability issues by increasing sample sizes, statistical power, and representativeness of data. While there is tremendous potential to advance science through open data sharing, these efforts unveil a host of new questions about how to integrate data arising from distinct sources and instruments. We focus on the most frequently assessed area of cognition - memory testing - and demonstrate a process for reliable data harmonization across three common measures. We aggregated raw data from 53 studies from around the world which measured at least one of three distinct verbal learning tasks, totaling N = 10,505 healthy and brain-injured individuals. A mega analysis was conducted using empirical bayes harmonization to isolate and remove site effects, followed by linear models which adjusted for common covariates. After corrections, a continuous item response theory (IRT) model estimated each individual subject’s latent verbal learning ability while accounting for item difficulties. Harmonization significantly reduced inter-site variance by 37% while preserving covariate effects. The effects of age, sex, and education on scores were found to be highly consistent across memory tests. IRT methods for equating scores across AVLTs agreed with held-out data of dually-administered tests, and these tools are made available for free online. This work demonstrates that large-scale data sharing and harmonization initiatives can offer opportunities to address reproducibility and integration challenges across the behavioral sciences.
Six new species of the weevil genus Cercopeus Schoenherr are described from South Carolina: C. alexi, C. cornelli, C. femoratus, C. paulus, C. skelleyi, and C. tibialis. Three other species also found in South Carolina are redescribed: C. chrysorrhoeus (Say), C. maspavancus Sleeper, and C. strigicollis Sleeper. Keys to known males and females of all 17 species of Cercopeus are given, along with photographs of habitus, leg features, and antennae, and line illustrations of genitalia. Nearly all specimens of the new species were collected from January-March and these species are winter active.
This paper considers archaeological evidence for warfare and conflict in Bronze Age Ireland, with specific reference to the destruction of hillforts during the later second millennium BC. These centres were built at a time of growing militarism, reflected in an increased output of bronze weaponry, including the first use of swords. The indications are of a society obsessed with power and status, with competitive tendencies that on occasion led to open warfare. Recent fieldwork has uncovered evidence of conflict at a number of hillforts across Ireland, the significance of which is considered in relation to the political landscape of the Middle and Late Bronze Age.
Research on Bronze Age weapons from wet contexts in northern Europe often interprets those finds as structured deposits of a symbolic nature, placed in liminal environments that had special significance in social and religious terms. Much less consideration is given to direct or indirect connections with war and conflict in the competitive chiefdom polities of the Bronze Age. As territorial boundaries, rivers were obvious settings for conflict, with confrontations at fording points leading to weapon loss in battle. There may also have been intentional deposition connected to the death of a warrior at or near that location. River deposition may also signify the celebration of a military victory, involving a ritualized destruction of the weapons of the vanquished. They may also represent an assertion of territory or an expression of ritualized violence. Such scenarios illustrate how the use of weapons as funerary or votive offerings does not preclude a close association with warfare. The parallel phenomenon of hoarding in the same period may reflect a political climate in which it was necessary to hide valuables. This paper explores possible connections between the deposition of weapons and valuables in wet contexts and the landscape context of war in Ireland during the later Bronze Age, with implications for research in other parts of Europe.
Panel discussion
(2019)