Sunday 27 November 2011

Capacity-Speed Relationships in Prefrontal Cortex


RESEARCH ARTICLE

Capacity-Speed Relationships in Prefrontal Cortex

Vivek Prabhakaran1,2,3*Bart Rypma4Nandakumar S. Narayanan5Timothy B. Meier2Benjamin P. Austin6,Veena A. Nair1Lin Naing3Lisa E. Thomas7John D. E. Gabrieli8
1 Radiology, University of Wisconsin-Madison, Madison, Wisconsin, United States of America, 2 Neuroscience Training Program, University of Wisconsin-Madison, Madison, Wisconsin, United States of America, 3 School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America, 4Center for Brain Health, University of Texas-Dallas, Dallas, Texas, United States of America, 5 Department of Neurology, Yale University, New Haven, Connecticut, United States of America, 6 Cardiovascular Research Center, University of Wisconsin-Madison, Madison, Wisconsin, United States of America, 7 Departments of Emergency Medicine, Brigham & Women's Hospital and Massachusetts General Hospital, Boston, Massachusetts, United States of America, 8 Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America

Abstract Top

Working memory (WM) capacity and WM processing speed are simple cognitive measures that underlie human performance in complex processes such as reasoning and language comprehension. These cognitive measures have shown to be interrelated in behavioral studies, yet the neural mechanism behind this interdependence has not been elucidated. We have carried out two functional MRI studies to separately identify brain regions involved in capacity and speed. Experiment 1, using a block-design WM verbal task, identified increased WM capacity with increased activity in right prefrontal regions, and Experiment 2, using a single-trial WM verbal task, identified increased WM processing speed with increased activity in similar regions. Our results suggest that right prefrontal areas may be a common region interlinking these two cognitive measures. Moreover, an overlap analysis with regions associated with binding or chunking suggest that this strategic memory consolidation process may be the mechanism interlinking WM capacity and WM speed.

Friday 11 November 2011

ROCKSTAR SONGS

                                                         ROCKSTAR SONGS




phir se ud chala  Mohit Chauhan :
 http://sound26.mp3pk.com/indian/rockstar/rockstar01(www.songs.pk).mp3

Jo Bhi Main  Mohit Chauhan, Additional Vocal
http://sound26.mp3pk.com/indian/rockstar/rockstar02(www.songs.pk).mp3

Katiya Karun  Harshdeep Kaur :
http://sound26.mp3pk.com/indian/rockstar/rockstar03(www.songs.pk).mp3

Kun Faya Kun  A.R Rahman, Javed Ali, Mohit Chauhan
http://sound26.mp3pk.com/indian/rockstar/rockstar04(www.songs.pk).mp3

Sheher Mein  Mohit Chauhan, Karthik  :
http://sound26.mp3pk.com/indian/rockstar/rockstar05(www.songs.pk).mp3

Hawaa Hawaa  Mohit Chauhan:
http://sound26.mp3pk.com/indian/rockstar/rockstar06(www.songs.pk).mp3

Aur Ho  Mohit Chauhan, Alma Ferovic:
http://sound26.mp3pk.com/indian/rockstar/rockstar07(www.songs.pk).mp3

Tango For Taj  Instrumental :
http://sound26.mp3pk.com/indian/rockstar/rockstar08(www.songs.pk).mp3

Tum Ko  Kavita Subamaniam :
http://sound26.mp3pk.com/indian/rockstar/rockstar09(www.songs.pk).mp3

The Dichotomy Of Fame Instrumental feat. Balesh, Kabuli
http://sound26.mp3pk.com/indian/rockstar/rockstar10(www.songs.pk).mp3

Nadaan Parinde  A.R Rahman, Mohit Chauhan :
http://sound26.mp3pk.com/indian/rockstar/rockstar11(www.songs.pk).mp3

Tum Ho  Mohit Chauhan, Suzanne D'Mello
http://sound26.mp3pk.com/indian/rockstar/rockstar12(www.songs.pk).mp3

Saada Haq  Mohit Chauhan, feat. Orianthi, Clinton Cerejo :
http://sound26.mp3pk.com/indian/rockstar/rockstar13(www.songs.pk).mp3

Meeting Place  Ranbir Kapoor :
http://sound26.mp3pk.com/indian/rockstar/rockstar14(www.songs.pk).mp3

Nargis Fakhri
A R Rahman