Northern Illinois University

About: Northern Illinois University is a education organization based out in DeKalb, Illinois, United States. It is known for research contribution in the topics: Large Hadron Collider & Population. The organization has 8818 authors who have published 20008 publications receiving 632341 citations. The organization is also known as: NIU.

Normal conditioned inhibition and extinction of freezing and fear-potentiated startle following electrolytic lesions of medical prefrontal cortex in rats.

Abstract: The authors investigated the role of medial prefrontal cortex (mPFC) in the inhibition of conditioned fear in rats using both Pavlovian extinction and conditioned inhibition paradigms. In Experiment 1, lesions of ventral mPFC did not interfere with conditioned inhibition of the fear-potentiated startle response. In Experiment 2, lesions made after acquisition of fear conditioning did not retard extinction of fear to a visual conditioned stimulus (CS) and did not impair "reinstatement" of fear after unsignaled presentations of the unconditioned stimulus. In Experiment 3, lesions made before fear conditioning did not retard extinction of fear-potentiated startle or freezing to an auditory CS. In both Experiments 2 and 3, extinction of fear to contextual cues was also unaffected by the lesions. These results indicate that ventral mPFC is not essential for the inhibition of fear under a variety of circumstances.

Measuring Dimensions of Purchaser Trust of Industrial Salespeople

Abstract: Trust was conceptualized as the extent to which a salesperson exhibited five attributes: dependable, reliable, honest, responsible, and likeable. Scales were developed to measure each component as well as overall trust. The measures were found to satisfy some of the basic psychometric criteria for measurement. Also, descriptive information on the extent to which industrial buyers trusted salespeople found that while buyers tended to trust salespeople, room for improvement existed.

Structural phase transition and the electronic and magnetic properties of Sr 2 FeMoO 6

Abstract: The nuclear and magnetic structures of ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ have been investigated using neutron powder diffraction and M\"ossbauer spectroscopy at temperatures between 10 and 460 K. Fe and Mo atoms are found to order on alternate sites, as expected, giving rise to a double-perovskite-type unit cell. Upon cooling, a structural phase transition from cubic $\mathrm{Fm}3\ifmmode\bar\else\textasciimacron\fi{}m$ to tetragonal $I4/m$ occurs at \ensuremath{\sim}400 K. In the tetragonal $I4/m$ structure as the temperature decreases, the ${\mathrm{FeO}}_{6}$ and ${\mathrm{MoO}}_{6}$ octahedra rotate continuously around the c axis by an angle of up to \ensuremath{\sim}5.6\ifmmode^\circ\else\textdegree\fi{}. In the $I4/m$ phase, the magnetic moments for Fe and Mo order ferrimagnetically. The Fe magnetic spins first align along the c direction and then rotate to an angle of \ensuremath{\sim}54\ifmmode^\circ\else\textdegree\fi{} with respect to the c axis; the refined Fe magnetic moment saturates at $\ensuremath{\sim}4.3{\ensuremath{\mu}}_{B}.$ M\"ossbauer spectroscopy measurements show that the average valence of Fe is intermediate between the high spin configuration values of ${\mathrm{Fe}}^{+2}$ and ${\mathrm{Fe}}^{+3}.$ The temperature dependence of the mean hyperfine field is in good agreement with the neutron-diffraction results and gives the same transition temperature.