6 research outputs found
Neural Relax
We present an algorithm for data preprocessing of an associative memory
inspired to an electrostatic problem that turns out to have intimate relations
with information maximization
Information content in continuous attractor neural networks is preserved in the presence of moderate disordered background connectivity
Continuous attractor neural networks (CANN) form an appealing conceptual
model for the storage of information in the brain. However a drawback of CANN
is that they require finely tuned interactions. We here study the effect of
quenched noise in the interactions on the coding of positional information
within CANN. Using the replica method we compute the Fisher information for a
network with position-dependent input and recurrent connections composed of a
short-range (in space) and a disordered component. We find that the loss in
positional information is small for not too large disorder strength, indicating
that CANN have a regime in which the advantageous effects of local connectivity
on information storage outweigh the detrimental ones. Furthermore, a
substantial part of this information can be extracted with a simple linear
readout.Comment: 20 pages, 6 figure
Psychophysical Determination of the Relevant Colours That Describe the Colour Palette of Paintings
In an early study, the so-called “relevant colour” in a painting was heuristically introduced
as a term to describe the number of colours that would stand out for an observer when just glancing
at a painting. The purpose of this study is to analyse how observers determine the relevant colours
by describing observers’ subjective impressions of the most representative colours in paintings and to
provide a psychophysical backing for a related computational model we proposed in a previous work.
This subjective impression is elicited by an efficient and optimal processing of the most representative
colour instances in painting images. Our results suggest an average number of 21 subjective colours.
This number is in close agreement with the computational number of relevant colours previously
obtained and allows a reliable segmentation of colour images using a small number of colours
without introducing any colour categorization. In addition, our results are in good agreement with
the directions of colour preferences derived from an independent component analysis. We show
that independent component analysis of the painting images yields directions of colour preference
aligned with the relevant colours of these images. Following on from this analysis, the results suggest
that hue colour components are efficiently distributed throughout a discrete number of directions
and could be relevant instances to a priori describe the most representative colours that make up the
colour palette of paintings.FEDER Funds by the Spanish Ministry of Science Innovation
and Universities (MICINN, grant number RTI2018-094738-B-I00