Do retinal ganglion cells project natural scenes to their principal subspace and whiten them?

Several theories of early sensory processing suggest that it whitens sensory stimuli. Here, we test three key predictions of the whitening theory using recordings from 152 ganglion cells in salamander retina responding to natural movies. We confirm the previous finding that firing rates of ganglion cells are less correlated compared to natural scenes, although significant correlations remain. We show that while the power spectrum of ganglion cells decays less steeply than that of natural scenes, it is not completely flattened. Finally, we find evidence that only the top principal components of the visual stimulus are transmitted.Comment: 2016 Asilomar Conference on Signals, Systems and Computer

Latihan Hadroh di Dusun Banyunganti Kidul (Studi Living Hadis : Teori Fungsional Thomas F. O\u27dea)

Hadith about fadhilah (virtue) of reading shalawat has penetrated the soul of society in Banyunganti Kidul. Hadroh and shalawat exercise get more popular at Banyunganti Kidul, so it\u27s always held on every week. This social phenomenon implies that religion becomes one of the important indicators. Especially the hadiths relating to command and fadhilah (virtue) give shalawat on prophets. Thus forming the mindset and religious spirit of Banyunganti Kidul\u27s society.This phenomenon is also called by living hadith. The phenomenology approach especially functional theory became the focus of this study. It can be concluded that this phenomenon is a growing tradition in society. It is also a study of contemporary hadith that can shift the existence of previous hadith research

ANALYSIS OF SHARIA MARKETING CONSTRAINTS IN INDONESIA

The purpose of this study is to theoretically examine the various constraints of sharia marketing in Indonesia in the general sector, banking, and insurance. The method used is a descriptive method by studying literature and realistic phenomena that develop in Indonesia. Data analysis was performed using four stages of descriptive analysis. Based on the results of the study, it can be concluded that the marketing constraints in Indonesia can be classified into two major typologies, namely the constraints of Muslim internal marketing itself (micro) and from the outside (macro). Constraints from within can be overcome by increasing the capacity of all Islamic resources owned. Meanwhile, external constraints are overcome by suggesting to the government, the Ministry of Finance, BI, and the FSA to always increase its support for the Islamic economy in the form of regulations and other support.==============================================================================================Analisis Hambatan Marketing Syariah di Indonesia. Tujuan dari penelitian ini adalah untuk menguji secara teoritis berbagai kendala pemasaran syariah di Indonesia di sektor umum, perbankan dan asuransi. Metode yang digunakan adalah metode deskriptif dengan mempelajari literatur dan fenomena realistis yang berkembang di Indonesia. Analisis data dilakukan dengan menggunakan empat tahap analisis deskriptif. Berdasarkan hasil penelitian, dapat disimpulkan bahwa kendala pemasaran di Indonesia dapat diklasifikasikan menjadi dua tipologi utama, yaitu kendala pemasaran internal Muslim itu sendiri (mikro) dan dari luar (makro). Kendala dari dalam dapat diatasi dengan meningkatkan kapasitas semua sumber daya Islam yang dimiliki. Sementara itu, kendala eksternal diatasi dengan menyarankan kepada pemerintah, Kementerian Keuangan, BI, dan FSA untuk selalu meningkatkan dukungannya bagi ekonomi Islam dalam bentuk regulasi dan dukungan lainnya

Revolutionaries and spies: Spy-good and spy-bad graphs

We study a game on a graph $G$ played by $r$ {\it revolutionaries} and $s$ {\it spies}. Initially, revolutionaries and then spies occupy vertices. In each subsequent round, each revolutionary may move to a neighboring vertex or not move, and then each spy has the same option. The revolutionaries win if $m$ of them meet at some vertex having no spy (at the end of a round); the spies win if they can avoid this forever. Let $\sigma(G,m,r)$ denote the minimum number of spies needed to win. To avoid degenerate cases, assume |V(G)|\ge r-m+1\ge\floor{r/m}\ge 1. The easy bounds are then \floor{r/m}\le \sigma(G,m,r)\le r-m+1. We prove that the lower bound is sharp when $G$ has a rooted spanning tree $T$ such that every edge of $G$ not in $T$ joins two vertices having the same parent in $T$. As a consequence, \sigma(G,m,r)\le\gamma(G)\floor{r/m}, where $\gamma(G)$ is the domination number; this bound is nearly sharp when $\gamma(G)\le m$. For the random graph with constant edge-probability $p$, we obtain constants $c$ and $c'$ (depending on $m$ and $p$) such that $\sigma(G,m,r)$ is near the trivial upper bound when $r<c\ln n$ and at most $c'$ times the trivial lower bound when $r>c'\ln n$. For the hypercube $Q_d$ with $d\ge r$, we have $\sigma(G,m,r)=r-m+1$ when $m=2$, and for $m\ge 3$ at least $r-39m$ spies are needed. For complete $k$-partite graphs with partite sets of size at least $2r$, the leading term in $\sigma(G,m,r)$ is approximately $\frac{k}{k-1}\frac{r}{m}$ when $k\ge m$. For $k=2$, we have \sigma(G,2,r)=\bigl\lceil{\frac{\floor{7r/2}-3}5}\bigr\rceil and \sigma(G,3,r)=\floor{r/2}, and in general $\frac{3r}{2m}-3\le \sigma(G,m,r)\le\frac{(1+1/\sqrt3)r}{m}$.Comment: 34 pages, 2 figures. The most important changes in this revision are improvements of the results on hypercubes and random graphs. The proof of the previous hypercube result has been deleted, but the statement remains because it is stronger for m<52. In the random graph section we added a spy-strategy resul

Centennial- to millennial-scale hard rock erosion rates deduced from luminescence-depth profiles

The measurement of erosion and weathering rates in different geomorphic settings and over diverse temporal and spatial scales is fundamental to the quantification of rates and patterns of earth surface processes. A knowledge of the rates of these surface processes helps one to decipher their relative contribution to landscape evolution – information that is crucial to understanding the interaction between climate, tectonics and landscape. Consequently, a wide range of techniques has been developed to determine short- (&lt;102 a) and long-term (&gt;104 a) erosion rates. However, no method is available to quantify hard rock erosion rates at centennial to millennial timescales. Here we propose a novel technique, based on the solar bleaching of luminescence signals with depth into rock surfaces, to bridge this analytical gap. We apply our technique to glacial and landslide boulders in the Eastern Pamirs, China. The calculated erosion rates from the smooth varnished surfaces of 7 out of the 8 boulders sampled in this study vary between &lt;0.038±0.002 and 1.72±0.04 mmka-1 (the eighth boulder gave an anomalously high erosion rate, possibly due to a recent chipping/cracking loss of surface). Given this preferential sampling of smooth surfaces, assumed to arise from grain-by-grain surface loss, we consider these rates as minimum estimates of rock surface denudation rates in the Eastern Pamirs, China