The present study investigates the event related potential (ERP) components associated with the random version of the Sustained Attention to Response Task (SART). The random SART is a Go/No-Go task in which the No-Go target appears unpredictably and rarely. In the present experiment, the EEG was recorded from 58 electrodes with mastoids as reference. As expected, the N2 and P3 were larger in th...

BACKGROUND We examine the environmental, climatic and geographical controls on tropical ostracod distribution in the marine Ordovician of North America. METHODOLOGY/PRINCIPAL FINDINGS Analysis of the inter-regional distribution patterns of Ordovician Laurentian ostracods, focussing particularly on the diverse Late Ordovician Sandbian (ca 461 to 456 Ma) faunas, demonstrates strong endemicity a...

Although atmospheric concentrations of many conventional persistent organic pollutants (POPs) have decreased in the Arctic over past few decades, levels most POPs and mercury remain high since 1990s or start to increase again areas, especially polar bears. So far, studies generally focused on individual effects POPs, do not directly link POP prey species population-specific parameters. In this ...

Attention shapes our expectations and perceptions: The neural mechanisms of top-down attention during adulthood and development By SNIGDHA BANERJEE Adviser: John J. Foxe, PhD Top-down attention is the focusing of attention at one’s will through knowledge regarding a current task. There is evidence that top-down attention involves the modulation of sensory cortices by higher order regions. Howev...

Melting glaciers and ice caps on Baffin Island contribute roughly half of the sea-level rise from all ice in Arctic Canada, although they comprise only one-fourth of the total ice in the region. The uncertain future response of arctic glaciers and ice caps to climate change motivates the use of paleodata to evaluate the sensitivity of glaciers to past warm intervals and to constrain mechanisms ...

The objective of this study was to compare boneconduction (BC) auditory steady-state responses (ASSR) for infants and adults with normal hearing to investigate the time course of maturation of BC hearing sensitivity. Bone-conduction multiple ASSRs were recorded in 0 11-month-old (n 35), and 12 24-monthold infants (n 13), and adults (n 18). Low-frequency BC ASSR thresholds increased with age, wh...

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