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"Matthews, William"
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Stimulus Repetition and the Perception of Time: The Effects of Prior Exposure on Temporal Discrimination, Judgment, and Production
It has been suggested that repeated stimuli have shorter subjective duration than novel items, perhaps because of a reduction in the neural response to repeated presentations of the same object. Five experiments investigated the effects of repetition on time perception and found further evidence that immediate repetition reduces apparent duration, consistent with the idea that subjective duration is partly based on neural coding efficiency. In addition, the experiments found (a) no effect of repetition on the precision of temporal discrimination, (b) that the effects of repetition disappeared when there was a modest lag between presentations, (c) that, across participants, the size of the repetition effect correlated with temporal discrimination, and (d) that the effects of repetition suggested by a temporal production task were the opposite of those suggested by temporal judgments. The theoretical and practical implications of these results are discussed.
Journal Article
The world encyclopedia of musical instruments
A comprehensive encyclopaedia of musical instruments, covering all sections of the orchestra: strings, woodwind and brass, percussion, keyboard and the voice, as well as historical, rare and non-western instruments. An illustrated guide to instruments and their historical relatives, with specially commissioned photographs of all the modern instruments. Famous players, orchestras and concert halls, and the role of the composer and the conductor. A history of music-making, beginning with man's first discovery of music and its development in the ancient civilizations of Egypt, Greece, India, China and Japan, charting key turning points such as the invention of the bow and valves, and ending with the modern instruments of the twentieth century. Includes information on the evolution of the orchestra -- from mediaeval consorts, baroque and classical orchestras, through to the modern symphony orchestra we know today. Explores other forms such as folk music, brass and military bands, country music, jazz bands, big bands and pop groups.
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Disturbance and trajectory of change in a stream fish community over four decades
Communities can change gradually or abruptly, and directionally (to an alternate state) or non-directionally. We briefly review the history of theoretical and empirical perspectives on community change, and propose a new framework for viewing temporal trajectories of communities in multivariate space. We used a stream fish dataset spanning 40 years (1969–2008) in southern Oklahoma, USA, emphasizing our own 1981–2008 collections which included well-documented, extreme drought and flood events, to assess dynamics of and environmental factors affecting the fish community. We evaluated the trajectory of the Brier Creek community in multivariate space relative to trajectories in 27 published studies, and for Brier Creek fish, tested hypotheses about gradual versus event-driven changes and persistence of shifts to alternate states. Most species were persistent, qualitatively, across the four decades, but varied widely in abundance, with some having unusually strong reproduction after extreme droughts. The community had an early period of relatively gradual and directional change, but greater displacement than predicted at random after two consecutive extreme droughts midway through the study (1998 and 2000). But, the community subsequently returned toward its former state in the last decade. This fish community is characterized by species that are tolerant of environmental extremes, and have life history traits that facilitate population recovery. The community appears \"loosely stable\" about a long-term average condition, but the impacts of the two consecutive droughts were substantial, and may foretell future dynamics of this or other communities in a changed global climate if disturbance events become more frequent or severe.
Journal Article
A Roadmap for Gigabit to Terabit Optical Wireless Communications Receivers
Silicon photomultipliers’ relatively large areas and ability to detect single photons make them attractive as receivers for optical wireless communications. In this paper, the relative importance of the non-linearity and width of SiPMs’ fast output in their performance in receivers is investigated using Monte Carlo simulations. Using these results, the performances of receivers containing different SiPMs are estimated. This is followed by a discussion of the potential performances of arrays of existing SiPMs. Finally, the possible dramatic improvements in performance that could be achieved by using two stacked integrated circuits are highlighted.
Journal Article
Excess Success for Psychology Articles in the Journal Science
This article describes a systematic analysis of the relationship between empirical data and theoretical conclusions for a set of experimental psychology articles published in the journal Science between 2005-2012. When the success rate of a set of empirical studies is much higher than would be expected relative to the experiments' reported effects and sample sizes, it suggests that null findings have been suppressed, that the experiments or analyses were inappropriate, or that the theory does not properly follow from the data. The analyses herein indicate such excess success for 83% (15 out of 18) of the articles in Science that report four or more studies and contain sufficient information for the analysis. This result suggests a systematic pattern of excess success among psychology articles in the journal Science.
Journal Article
Dynamics of an upland stream fish community over 40 years: trajectories and support for the loose equilibrium concept
Previous theoretical models and empirical studies suggested that communities can exist in a “stochastic” or “loose” equilibrium, diverging transiently but eventually returning toward earlier or average structure, in what we call here the “loose equilibrium concept” (LEC). We sampled the fish communities at 12 local stream reaches spaced broadly throughout a relatively undisturbed watershed in the Ozark Mountains of northern Arkansas, USA, in 11 surveys from 1972 to 2012 at a scale of decades, and at a subset of five of these local sites in a total of 16 surveys, allowing tests of the LEC at different spatial and temporal scales. Multivariate analyses of the dynamics of communities over the 40‐year period provided support for the LEC at both “global” and “local” scales within the watershed. At the broadest spatial scale, core species numerically dominated the community, and most common species remained so across all decades. In spite of two extraordinary floods, and interannual variation in abundance of some species, the 12‐site and five‐site global communities and eight of 12 local communities repeatedly returned toward average positions in multivariate space. Trajectories of the global and local fish communities varied relative to model hypothetical trajectories that were based on gradual vs. saltatory changes, and prevalence of returns toward average community structure. Beta diversity among sites was variable across time, but beta partitioning consistently showed that pure spatial turnover dominated over nestedness, because many common species were consistently distributed either upstream or downstream. This study suggests that vertebrate communities in relatively undisturbed environments may display dynamics consistent with the LEC. The LEC, combined with quantification of community trajectory patterns, can help to clarify whether systems are moving about within ranges of conditions that reflect expected noise, or, conversely, have moved so far out of previous bounds, as a result of climate change or human intervention, that they are permanently changed or “novel.”
Journal Article
Disruption and localization of sediment pathways by continental extension: Detrital-zircon provenance change from upper Triassic to lower Jurassic in the northern Sverdrup Basin, Nunavut
Constraints on the tectonic setting of the upper Triassic to lower Jurassic in the Sverdrup Basin can be elucidated from detrital-zircon U-Pb ages. During the Triassic, there was a dual provenance system into sedimentary basins along the western and northern margins of Laurentia. One of the sediment sources was from an extra-basinal igneous source of Permian-Triassic zircon while the other source was recycled sediment eroded from older sedimentary basins. The Heiberg Formation/Group was deposited during a period of significant siliciclastic sedimentation into the basin from the upper Triassic to the lower Jurassic and comprises three members: Romulus, Fosheim and Remus. Previous work has interpreted that the Carboniferous-Permian-Triassic detrital zircon had stopped reaching the northern part of the Sverdrup Basin by deposition of the upper Heiberg Formation (lower Jurassic). New detrital-zircon age analyses from samples along the northern part of the basin spanning different horizons in the Heiberg Formation show that the typical extra-basinal signature, with abundant Carboniferous-Permian-Triassic ages, was no longer recorded during the initial deposition of the Fosheim Member during the latest Triassic. Previously published basin analysis from the Sverdrup Basin interprets syn-Jurassic extensional faults and so we relate the provenance change to the onset of extension. It is interpreted that the Sverdrup Basin transitioned from a basin that received sediment from a northern extra-basinal igneous source during deposition of the Romulus Member to an extensional basin by the deposition of the Fosheim Member in the latest Triassic, as the northern sediment source was interrupted by intervening extensional basins of the proto-Amerasia Basin.
Journal Article