433 research outputs found
Knowledge of Aphasia: Results of a Survey
Knowledge of aphasia was assessed for 113 adults living in a stroke belt state who had indicated they had heard about aphasia with a 13-item aphasia knowledge quiz. Results indicated respondents knew aphasia was a communication problem caused by stroke that affected verbal functions, but less than half the respondents were aware of the multimodal impact of the disorder. Scores on the aphasia knowledge quiz suggested hearing about aphasia does not translate to knowledge about aphasia, its symptoms, or its causes. Results of the study provide helpful guidelines for increasing public awareness of aphasia through education and training
Rubric scoring of a clinical test of executive functioning
Executive functions (EF) are complex abilities that allow one to successfully complete independent, deliberate, and novel goal-directed activities (Lezak, Howieson, & Loring, 2004). EF tests require solving problems with minimal direction from the examiner (Baddeley, 1992; Shallice & Burgess, 1991). Because EF skills tend to show up globally, Lezak et al. (2004) suggested clinicians will learn more about one’s EF abilities by observing how he or she goes about solving a problem than from a test score. If this is the case, a “rubric” score that took into consideration “how” a problem was solved may provide the clinician with better information for treatment planning than a test score, as long as it did not greatly affect test sensitivity or specificity. Sensitivity and specificity are important factors in determining the usefulness of EF tests. Sensitivity refers to the probability of identifying abnormal functioning in an impaired individual or “hit rate” of a test, whereas specificity reflects the probability of correctly identifying healthy individual with the test (Cartoni & Lincoln, 2005; Kiel & Kaszniak, 2002).
Rubrics are useful scoring tools that divide tasks into component elements and provide a description of levels of performance for each element (Goodrich, 2005; Hanna & Smith, 1998). Rubrics have been widely used to assess student performance (Andrade, 2000; Falchikov, 1986; Goodrich, 1997), but have not been used to score EF tests. The aim of this study was to examine sensitivity and specificity for a clinical test of EF, the Rapid Assessment of Problem Solving test (RAPS) when scored with a rubric that allowed the examiner to describe the quality of performance using a standard that was developed from a large body of normative research. This differs from using the three traditional test scores from the RAPS that require time intensive calculations
An exploratory investigation of the effects of reward schedule changes on children's speech fluency /
An Untriggered Search for Optical Bursts
We present an untriggered search for optical bursts with the ROTSE-I
telephoto array. Observations were taken which monitor an effective 256 square
degree field continuously over 125 hours to m_{ROTSE}=15.7. The uniquely large
field, moderate limiting magnitude and fast cadence of 10 minutes permits
transient searches in a new region of sensitivity. Our search reveals no
candidate events. To quantify this result, we simulate potential optical bursts
with peak magnitude, m_{p}, at t=10 s, which fade as f=(\frac{t}{t_{0}})
^{\alpha_{t}}, where \alpha_t < 0. Simple estimates based on observational
evidence indicate that a search of this sensitivity begins to probe the
possible region occupied by GRB orphan afterglows. Our observing protocol and
image sensitivity result in a broad region of high detection efficiency for
light curves to the bright and slowly varying side of a boundary running from
[\alpha_{t},m_{p}]=[-2.0,6.0] to [-0.3,13.2]. Within this region, the
integrated rate of brief optical bursts is less than 1.1\times 10^{-8} {\rm
s}^{-1} {\rm deg}^{-2}. At 22 times the observed GRB rate from BATSE,
this suggests a limit on \frac{\theta_{opt}}{\theta_{\gamma}}\lesssim 5 where
\theta_{opt} and \theta_{\gamma} are the optical and gamma-ray collimation
angles, respectively. Several effects might explain the absence of optical
bursts, and a search of the kind described here but more sensitive by about 4
magnitudes should offer a more definitive probe.Comment: 8 pages, 6 figures, 1 tabl
A Search for Early Optical Emission from Short and Long Duration Gamma-ray Bursts
Gamma-ray bursts of short duration may harbor vital clues to the range of
phenomena producing bursts. However, recent progress from the observation of
optical counterparts has not benefitted the study of short bursts. We have
searched for early optical emission from six gamma-ray bursts using the ROTSE-I
telephoto array. Three of these events were of short duration, including GRB
980527 which is among the brightest short bursts yet observed. The data consist
of unfiltered CCD optical images taken in response to BATSE triggers delivered
via the GCN. For the first time, we have analyzed the entire 16 degree by 16
degree field covered for five of these bursts. In addition, we discuss a search
for the optical counterpart to GRB 000201, a well-localized long burst. Single
image sensitivities range from 13th to 14th magnitude around 10 s after the
initial burst detection, and 14 - 15.8 one hour later. No new optical
counterparts were discovered in this analysis suggesting short burst optical
and gamma-ray fluxes are uncorrelated.Comment: 8 pages, 2 figures, subm. to ApJ Let
Prompt Optical Observations of Gamma-ray Bursts
The Robotic Optical Transient Search Experiment (ROTSE) seeks to measure
simultaneous and early afterglow optical emission from gamma-ray bursts (GRBs).
A search for optical counterparts to six GRBs with localization errors of 1
square degree or better produced no detections. The earliest limiting
sensitivity is m(ROTSE) > 13.1 at 10.85 seconds (5 second exposure) after the
gamma-ray rise, and the best limit is m(ROTSE) > 16.0 at 62 minutes (897 second
exposure). These are the most stringent limits obtained for GRB optical
counterpart brightness in the first hour after the burst. Consideration of the
gamma-ray fluence and peak flux for these bursts and for GRB990123 indicates
that there is not a strong positive correlation between optical flux and
gamma-ray emission.Comment: 4 pages, 3 figures, submitted to ApJ Letter
KELT-8b: A highly inflated transiting hot Jupiter and a new technique for extracting high-precision radial velocities from noisy spectra
We announce the discovery of a highly inflated transiting hot Jupiter
discovered by the KELT-North survey. A global analysis including constraints
from isochrones indicates that the V = 10.8 host star (HD 343246) is a mildly
evolved, G dwarf with K, , , an inferred mass
M, and radius
R. The planetary companion has mass , radius
, surface gravity , and density
g cm. The planet is on a roughly
circular orbit with semimajor axis AU and
eccentricity . The best-fit linear ephemeris is
BJD and
days. This planet is one of the most inflated of all known transiting
exoplanets, making it one of the few members of a class of extremely low
density, highly-irradiated gas giants. The low stellar and large
implied radius are supported by stellar density constraints from follow-up
light curves, plus an evolutionary and space motion analysis. We also develop a
new technique to extract high precision radial velocities from noisy spectra
that reduces the observing time needed to confirm transiting planet candidates.
This planet boasts deep transits of a bright star, a large inferred atmospheric
scale height, and a high equilibrium temperature of
K, assuming zero albedo and perfect heat redistribution, making it one of the
best targets for future atmospheric characterization studies.Comment: Submitted to ApJ, feedback is welcom
Recommended from our members
Endangered plants and animals of Oregon: I. Fishes
Published January 1966. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo
Recommended from our members
Endangered plants and animals of Oregon : IV Mammals
Published November 1973. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo
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