We used psychometric functions to estimate the joint entropy for space discrimination and spatial frequency discrimination. Space discrimination was taken as discrimination of spatial extent. Seven subjects were tested. Gábor functions comprising unidimensionalsinusoidal gratings (0.4, 2, and 10 cpd) and bidimensionalGaussian envelopes (1°) were used as reference stimuli. The experiment compris...

We assessed the effects of electronic collaboration using inter-organizational information systems (IOIS) on firm performance, particularly between dominant buyers and their suppliers. From the suppliers’ perspective, we examined ways in which higher levels of performance can be achieved by increasing the extent that they proactively participate in business activities using IOIS. We defined ele...

Most studies concerning expression data analyses usually exploit information on the variability of gene intensity across samples. This information is sensitive to initial data processing, which affects the final conclusions. However expression data contains scale-free information, which is directly comparable between different samples. We propose to use the pairwise ratio of gene expression val...

Sub-threshold operation is an efficient solution for ultra low power applications. However, it is very sensitive to process variability which can impact the robustness and effective performance of the circuit. On the other hand this sensitivity decreases as we move towards near-threshold operation. In this paper, the impact of variability on sub-threshold and near-threshold circuit performance ...

45 Eye movement behaviour is variable and the brain’s oculomotor circuitry may not always 46 function consistently. In a recent fMRI study, Ozyurt and Greenlee (2011) correlated the 47 activation strength of cortical and striatal brain regions with interand intra-individual variability 48 in saccade performance. We discuss the design and implications of this study with regard to the 49 differen...

Orientation{selective neurons in monkeys and cats show contrast saturation and contrast{invariant orientation tuning (1). Recently proposed models for orientation selectivity predict contrast invariant orientation tuning but no contrast saturation at high strength of intracortical recurrent couplings, whereas at lower coupling strengths the contrast response saturates but the tuning widths are ...

A simple sensitive and rapid colorimetric method has been developed, and herein described, for the qualitative and quantitative chemical assessment of the commercially available chitosan products. The described method relies on the reactivity of the basic amino function of chitosan with the acid dye bromocresol purple. The applied technique allows assessment of variability and selectivity chang...

Chan JL, Kucyi A. What can fMRI tell us about functional variability in the oculomotor system and saccade performance? J Neurophysiol 107: 2295–2297, 2012. First published January 18, 2012; doi:10.1152/jn.00724.2011.—Eye movement behavior is variable, and the brain’s oculomotor circuitry may not always function consistently. In a recent fMRI study, Ozyurt and Greenlee (2011) correlated the acti...