In their influential paper, Wichmann and Hill (2001) have shown that the threshold and slope estimates of a psychometric function may be severely biased when it is assumed that the lapse rate equals zero but lapses do, in fact, occur. Based on a large number of simulated experiments, Wichmann and Hill claim that threshold and slope estimates are essentially unbiased when one allows the lapse ra...

Much human learning appears to be gradual and unconscious, suggesting a very limited form of search through the space of hypotheses. We propose hill climbing as a framework for such learning and consider a number of systems that learn in this manner. We focus on CLASSIT, a model of concept formation that incrementally acquires a conceptual hierarchy, and MAGGIE, a model of skill improvement tha...

[1] Measurements from the incoherent scatter radar (ISR) and ionosonde over Millstone Hill (42.6 N, 288.5 E) are analyzed to explore ionospheric temporal variations. The F2 layer peak density NmF2, peak height hmF2, and scale height H are derived from a Chapman a layer fitting to observed ISR electron density profiles. Diurnal, seasonal, and solar activity variations of the ionospheric characte...

At Chapel Hill, Chapel Hill, North Carolina; Department of Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina; Sistemas Locales de Atención Integral a la Salud, León (SILAIS-León), Leon, Nicaragua; Hospital Escuela Oscar Danilo Rosales Argüello (HEODRA), León, Nicaragua, Leon, Nicaragua; Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill...

W. Gao, H. Zhu, K. Giovanello, K. Smith, D. Shen, J. Gilmore, and W. Lin Department of Biomedical Engineering, University of North Carolina-Chapel Hill, Chapel Hill, North Carolina, United States, Department of Biostatistics and BRIC, University of North Carolina-Chapel Hill, Department of Psychology and BRIC, University of North Carolina-Chapel Hill, Department of Radiology, University of Nort...

The experiments recorded in this paper, dealing with effects of 2537/~ on intact ceils of green algae, were initiated in the hope of gaining more insight into the nature and properties of the catalysts of photosynthesis sensitive to 2537/~; and, possibly by comparison of the sensitivities of the various processes studied, to gain some information as to the relation between them. We have investi...

OBJECTIVE To evaluate the clinical result from the filling ("remplissage") technique in association with Bankart lesion repair for treating recurrent anterior shoulder dislocation. METHODS Nine patients (10 shoulders), with a mean follow-up of 13.7 months, presented traumatic recurrent anterior shoulder dislocation. All of them had a Bankart lesion, associated with a Hill-Sachs lesion showing...

Awake versus Anesthetized: Layer-Specific Sensory Processing in Visual Cortex and 1 Functional Connectivity between Cortical Areas 2 3 Running Head: Anesthetics Disrupt Sensory Processing 4 5 Kristin K. Sellers, Davis V. Bennett, Axel Hutt , James H. Williams, and Flavio Frohlich 6 7 1 Department of Psychiatry, University of North Carolina at Chapel Hill, Chapel Hill NC 27599 8 2 Neurobiology C...