We analyze Rossi X–ray Timing Explorer (RXTE) Proportional Counter Array (PCA) data of the transient low mass X–ray binary (LMXB) system 1A 1744–361. We explore the X–ray intensity and spectral evolution of the source, perform timing analysis, and find that 1A 1744–361 shows ‘atoll’ behavior during the outbursts. The color-color diagram indicates that this LMXB was observed in a low intensity s...

It has been proposed that faces are represented in the visual brain as points within a multi-dimensional "face space", with the average at its origin. We adapted a psychophysical procedure that measures non-linearities in contrast transduction (by measuring discrimination around different reference/pedestal levels of contrast) to examine the encoding of facial-identity within such a notional sp...

The dipper effect for contrast discrimination provides strong evidence that the underlying neural response is accelerating at low contrasts and saturating at high contrasts. The contrast-response functions of V1 neurons do have this sigmoidal shape, but individual neurons do not generally have a dynamic range wide enough to account for the dipper effect. This paper presents a Bayesian model of ...