Biomedical subjects

Brent Wilson

Publications and source records attributed to Brent Wilson.

3 recordsLinked to original sources

PubMed2006

Creating partially deleted objects for perception research.

Line drawings are commonly used in perception research. A basic strategy used in such research is to remove portions of the line drawings in order to determine what features of an object are important for recognition. However, it is important to monitor the amount of contour and type of information that are deleted when one is making partially deleted or fragmented objects. With the Image Fragmenting Program, researchers can use random or manual contour deletion strategies to create fragmented objects while controlling for the amount of contour removed from the images.

Computers↗

PubMed2005

Particle size and energetics of gouge from earthquake rupture zones.

Grain size reduction and gouge formation are found to be ubiquitous in brittle faults at all scales, and most slip along mature faults is observed to have been localized within gouge zones. This fine-grain gouge is thought to control earthquake instability, and thus understanding its properties is central to an understanding of the earthquake process. Here we show that gouge from the San Andreas fault, California, with approximately 160 km slip, and the rupture zone of a recent earthquake in a South African mine with only approximately 0.4 m slip, display similar characteristics, in that ultrafine grains approach the nanometre scale, gouge surface areas approach 80 m2 g(-1), and grain size distribution is non-fractal. These observations challenge the common perception that gouge texture is fractal and that gouge surface energy is a negligible contributor to the earthquake energy budget. We propose that the observed fine-grain gouge is not related to quasi-static cumulative slip, but is instead formed by dynamic rock pulverization during the propagation of a single earthquake.

Journal Article↗

PubMedDate not supplied

The negotiation of intelligibility in an aphasic dyad.

Employing conversation analysis as a research technique, this study investigates the ways that unintelligibility is accounted for and overcome within a therapeutic encounter between an individual with aphasia and dysarthria and his clinician. The results emphasize the collaborative nature of intelligibility negotiation and demonstrate how both the individual with the impairment and his clinician employ various interactional strategies and knowledge resources to turn unintelligibility into intelligibility so that the therapeutic encounter may continue.

Aphasia↗