Optimizing the directional sensitivity of LISA

2003 ◽  
Vol 68 (12) ◽  
Author(s):  
K. Rajesh Nayak ◽  
S. V. Dhurandhar ◽  
A. Pai ◽  
J.-Y. Vinet
Keyword(s):  
Directional Sensitivity

scholarly journals Directional sensitivity in the thermal response of the facial pit in western diamondback rattlesnakes (Crotalus atrox)

2012 ◽  
Vol 215 (15) ◽  
pp. 2630-2636 ◽  
Author(s):  
T. Kohl ◽  
S. E. Colayori ◽  
G. Westhoff ◽  
G. S. Bakken ◽  
B. A. Young
Keyword(s):  
Thermal Response ◽  
Directional Sensitivity ◽  
Crotalus Atrox

High Responsiveness and Direction Sensitivity of Neurons in the Rat Thalamic Reticular Nucleus to Vibrissa Deflections

2000 ◽  
Vol 83 (5) ◽  
pp. 2791-2801 ◽  
Author(s):  
Jed A. Hartings ◽  
Simona Temereanca ◽  
Daniel J. Simons
Keyword(s):  
Sensory Information ◽  
Thalamic Reticular Nucleus ◽  
Reticular Nucleus ◽  
Directional Sensitivity ◽  
Starting Position ◽  
Baseline Activity ◽  
High Responsiveness ◽  
Direction Of Movement ◽  
Mystacial Vibrissae ◽  
Direction Sensitivity

The thalamic reticular nucleus (Rt) is strategically positioned to integrate descending and ascending signals in the control of sensorimotor and other thalamocortical activity. Its prominent role in the generation of sleep spindles notwithstanding, relatively little is known of Rt function in regulating interactions with the sensory environment. We recorded and compared the responses of individual Rt and thalamocortical neurons in the ventroposterior medial (VPm) nucleus of the rat to controlled deflections of mystacial vibrissae. Transient Rt responses to the onset (on) and offset (off) of vibrissa deflection are larger and longer in duration than those of VPm and of all other populations studied in the whisker/barrel pathway. Magnitudes of on and off responses in Rt were negatively correlated with immediately preceding activities, suggesting a contribution of low-threshold T-type Ca2+ channels. Rt neurons also respond with high tonic firing rates during sustained vibrissa deflections. By comparison, VPm neurons are less likely to respond tonically and are more likely to exhibit tonic suppression. Rt and VPm populations are similar to each other, however, in that they retain properties of directional sensitivity established in primary afferent neurons. In both populations neurons are selective for deflection angle and exhibit directional consistency, responding best to a particular direction of movement regardless of the starting position of the vibrissal hair. These findings suggest a role for Rt in the processing of detailed sensory information. Temporally, Rt may function to limit the duration of stimulus-evoked VPm responses and to focus them on rapid vibrissa perturbations. Moreover, by regulating the baseline activity of VPm neurons, Rt may indirectly enhance the response selectivity of layer IV barrel neurons to synchronous VPm firing.

Polarization-analyzed small-angle neutron scattering. II. Mathematical angular analysis

2012 ◽  
Vol 45 (3) ◽  
pp. 554-565 ◽  
Author(s):  
Kathryn Krycka ◽  
Julie Borchers ◽  
Yumi Ijiri ◽  
Ryan Booth ◽  
Sara Majetich
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Magnetic Moments ◽  
Magnetic Scattering ◽  
Directional Sensitivity ◽  
Angular Analysis ◽  
Structural Contribution ◽  
Anisotropic Systems ◽  
Simplified Procedures

Polarization-analyzed small-angle neutron scattering (SANS) is a powerful tool for the study of magnetic morphology with directional sensitivity. Building upon polarized scattering theory, this article presents simplified procedures for the reduction of longitudinally polarized SANS into terms of the three mutually orthogonal magnetic scattering contributions plus a structural contribution. Special emphasis is given to the treatment of anisotropic systems. The meaning and significance of scattering interferences between nuclear and magnetic scattering and between the scattering from magnetic moments projected onto distinct orthogonal axes are discussed in detail. Concise tables summarize the algorithms derived for the most commonly encountered conditions. These tables are designed to be used as a reference in the challenging task of extracting the full wealth of information available from polarization-analyzed SANS.

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