Showing 1341 - 1350 of 5831 Items
Sign Under the Domino Robinson-Schensted Maps
Date: 2014-01-01
Creator: Thomas Pietraho
Access: Open access
- We generalize a formula obtained independently by Reifegerste and Sjöstrand for the sign of a permutation under the classical Robinson-Schensted map to a family of domino Robinson-Schensted algorithms. © 2014 Springer Basel.
Midazolam-induced amnesia reduces memory for details and affects the ERP correlates of recollection and familiarity
Date: 2012-02-01
Creator: Erika Nyhus, Tim Curran
Access: Open access
- Dual process models suggest that recognition memory is supported by familiarity and recollection processes. Previous research administering amnesic drugs and measuring ERPs during recognition memory have provided evidence for separable neural correlates of familiarity and recollection. This study examined the effect of midazolam-induced amnesia on memory for details and the proposed ERP correlates of recognition. Midazolam or saline was administered while subjects studied oriented pictures of common objects. ERPs were recorded during a recognition test 1 day later. Subjects' discrimination of old and new pictures as well as orientation discrimination was worse when they were given midazolam instead of saline. As predicted, the parietal old/new effect was decreased with the administration of midazolam. However, weaker effects on FN400 old/new effects were also observed. These results provide converging pharmacological and electrophysiological evidence that midazolam primarily affects recollection as indexed by parietal ERP old/new effects and memory for orientation, while also exerting some weaker effects on familiarity as indexed by FN400 old/new effects. © 2011 Massachusetts Institute of Technology.
Neural inhibition enables selection during language processing
Date: 2010-09-21
Creator: Hannah R. Snyder, Natalie Hutchison, Erika Nyhus, Tim Curran, Marie T., Banich, Randall C. O'Reilly, Yuko Munakata
Access: Open access
- Whether grocery shopping or choosing words to express a thought, selecting between options can be challenging, especially for people with anxiety. We investigate the neural mechanisms supporting selection during language processing and its breakdown in anxiety. Our neural network simulations demonstrate a critical role for competitive, inhibitory dynamics supported by GABAergic interneurons. As predicted by our model, we find that anxiety (associated with reduced neural inhibition) impairs selection among options and associated prefrontal cortical activity, even in a simple, nonaffective verb-generation task, and the GABA agonist midazolam (which increases neural inhibition) improves selection, whereas retrieval from semantic memory is unaffected when selection demands are low. Neural inhibition is key to choosing our words.
BEING CAYLEY AUTOMATIC IS CLOSED under TAKING WREATH PRODUCT with VIRTUALLY CYCLIC GROUPS
Date: 2021-12-13
Creator: Dmitry Berdinsky, Murray Elder, Jennifer Taback
Access: Open access
- We extend work of Berdinsky and Khoussainov ['Cayley automatic representations of wreath products', International Journal of Foundations of Computer Science 27(2) (2016), 147-159] to show that being Cayley automatic is closed under taking the restricted wreath product with a virtually infinite cyclic group. This adds to the list of known examples of Cayley automatic groups.
The N = 2 U(N) gauge theory prepotential and periods from a perturbative matrix model calculation
Date: 2003-02-24
Creator: Stephen G. Naculich, Howard J. Schnitzer, Niclas Wyllard
Access: Open access
- We perform a completely perturbative matrix model calculation of the physical low-energy quantities of the N = 2 U(N) gauge theory. Within the matrix model framework we propose a perturbative definition of the periods a i in terms of certain tadpole diagrams, and check our conjecture up to first order in the gauge theory instanton expansion. The prescription does not require knowledge of the Seiberg-0Witten differential or curve.We also compute the N = 2 prepotential F(a) perturbatively up to the first-instanton level, finding agreement with the known result. 2002 Elsevier Science B.V. All rights reserved.
The Soviet and American Wars in Afghanistan: Applying Clausewitzian Concepts to Modern Military Failure
Date: 2020-01-01
Creator: Artur Kalandarov
Access: Open access
- This paper evaluates the validity of three concepts from Carl von Clausewitz’s On War as they relate to contemporary military conflict. Utilizing the Soviet and American Wars in Afghanistan as case studies, the paper also offers a model for comparative conflict analysis by expanding upon Clausewitz’s culminating point concept. It argues that – despite limitations to Clausewitz’s theory of war – his concepts of culminating points in military operations, mass and concentration, and changing war aims provide useful insights into counterinsurgency military failures. Chapter One identifies the Soviet and American culminating points. Concluding that the concept of a culminating point is not applicable to the means and objectives of insurgents, it expands upon Clausewitzian theory by presenting an effectual substitute: the Counterinsurgent Acceptance Point. This is the author’s idea, and it is defined as the moment at which the counterinsurgents first publicly call for negotiations with the enemy. As the first public acknowledgment that the insurgents have denied the counterinsurgents a strictly military resolution to the conflict, it marks a crucial shift in the political framework of the war and is a fitting antithesis to the culminating point. Chapters Two and Three show how an inadequate troop presence and unclear war aims harmed Soviet and American efforts in Afghanistan. The development of insurgencies in both wars are studied to pinpoint when both country’s leaderships failed to adopt a Clausewitzian view of war, despite calls to do so by General Colin Powell in 2001 and Marshal Nikolai Ogarkov in 1979.
Bowdoin College Catalogue (1912-1913)
Date: 1913-01-01
Access: Open access
- Bowdoin College Bulletin no. 44