17,746 research outputs found
Moving the Weber fraction: the perceptual precision for moment of inertia increases with exploration force
Get PDFHow does the magnitude of the exploration force influence the precision of haptic perceptual estimates? To address this question, we examined the perceptual precision for moment of inertia (i.e., an object’s ‘‘angular mass’’) under different force conditions, using the Weber fraction to quantify perceptual precision. Participants rotated a rod around a fixed axis and judged its moment of inertia in a two-alternative forced-choice task. We instructed different levels of exploration force, thereby manipulating the magnitude of both the exploration force and the angular acceleration. These are the two signals that are needed by the nervous system to estimate moment of inertia. Importantly, one can assume that the absolute noise on both signals increases with an increase in the signals’ magnitudes, while the relative noise (i.e., noise/signal) decreases with an increase in signal magnitude. We examined how the perceptual precision for moment of inertia was affected by this neural noise. In a first experiment we found that a low exploration force caused a higher Weber fraction (22%) than a high exploration force (13%), which suggested that the perceptual precision was constrained by the relative noise. This hypothesis was supported by the result of a second experiment, in which we found that the relationship between exploration force and Weber fraction had a similar shape as the theoretical relationship between signal magnitude and relative noise. The present study thus demonstrated that the amount of force used to explore an object can profoundly influence the precision by which its properties are perceived
Ms. Courtney Chartier, RWWL AUC, August 2011
No full textThis video is a conversation with Ms. Courtney Chartier. Ms. Chartier talks about her work on the "New Georgia Encyclopedia" and "Online Voter Education Project." Andrea Jackson, AUC Woodruff Library, is the interviewer
Ms. Neely Terrell, RWWL AUC, March 2012
No full textThis video is a conversation with Ms. Neely Terrell. Ms. Terrell talks about her book, "Super Singles Activate". Anthony Kinsey and Jahnesta Horney, AUC Woodruff Library, are the interviewers
Ms. Felesha Love, Spelman College, January 2016
No full textThis video is a conversation with Felesha Love. Ms. Love talks about her book, "Brave Leap to Freedom: Integrating Mind, Body, and Spirit to Cultivate Healthy Relationships". Jordan Moore, AUC Woodruff Library, is the interviewer
Personal Papers (MS 80-0002)
No full textLetter from I. H. Kempner to L. A. Weber discussing Kempner's appreciation for Weber wishing him a happy birthday
Undiagnosed Epileptic Case Since Childhood of Sturge-Weber Syndrome: First Case Report from Somalia
Get PDFSaid Abdi Mohamed,1 Nor Osman Sidow,1,2 Bakar Ali Adam,1 Mohamed Sheikh Hassan,1,3 Abdiwahid Ahmed Ibrahim,1 Mohamed Farah Osman,1 Abdulkadir Ahmed,1 Abdullahi Ali Roble4 1Department of Neurology, Mogadishu-Somalia Turkey Recep Tayyip Erdoğan Training and Research Hospital, Mogadishu, Somalia; 2Faculty of Medicine and Surgery, Jazeera University, Mogadishu, Somalia; 3Faculty of Medicine and Surgery, Mogadishu University, Mogadishu, Somalia; 4Department of Ophthalmology, Mogadishu-Somalia Turkey Recep Tayyip Erdoğan Training and Research Hospital, Mogadishu, SomaliaCorrespondence: Nor Osman Sidow, Tel +252618300616, Email [email protected]: Sturge-Weber syndrome is a rare, sporadic, progressive neurocutaneous condition that presents with congenital hamartomatous malformations, epilepsy, and a variety of facial symptoms. We discussed a rare case of an eighteen-year-old female child who came to our neurology department with status epilepticus, mental impairment, and a port-wine in the lateral left side of her face. We diagnosed Sturge-Weber syndrome after a thorough neurological and radiological evaluation. The purpose of presenting this case is to illustrate both the characteristic presentation and the complications associated with managing Sturge-Weber syndrome.Keywords: sturge-weber, seizure, port-win
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