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sabato 5 ottobre 2024
# brain: time delay in 'reservoir brain' as a reservoir network, a hypothesis
venerdì 14 aprile 2023
# gst: even a single bubble can produce creative musical outcomes
mercoledì 18 maggio 2022
# brain: jazzy perceptions inside, there’s more to all the noise; even in the dark, neurons of the visual cortex chat
mercoledì 30 giugno 2021
# gst: weird Nature; randomly arranged nanowire networks seem to behave, at the edge of chaos, like cortical neuronal cultures
sabato 5 giugno 2021
#life: reliability, deception and lies of a signal (among the Siberian jay Perisoreus infaustus)
lunedì 15 marzo 2021
# gst: an atomic imaging of a (slow) crack
mercoledì 9 settembre 2020
# gst: to reach detectability of a weak signal, they add background noise
sabato 25 luglio 2020
# gst: a simple signal to drive complex dynamics
mercoledì 3 giugno 2020
# behav: persistent neuronal firing during flight in flies, like a pulsating gambler who has to decide quickly
martedì 18 febbraio 2020
# lang: information management (encoding reliability) in bird communications (among wild redbreasted nuthatches, Sitta canadensis)
mercoledì 16 ottobre 2019
# gst: counterintuitively, even complex processes can be hidden inside flat power spectra
<< Power spectral densities are a common, convenient, and powerful way to analyze signals. So much so that they are now broadly deployed across the sciences and engineering - from quantum physics to cosmology, and from crystallography to neuroscience to speech recognition. The features they reveal not only identify prominent signal-frequencies but also hint at mechanisms that generate correlation and lead to resonance. Despite their near-centuries-long run of successes in signal analysis, here (AA) show that flat power spectra can be generated by highly complex processes, effectively hiding all inherent structure in complex signals. >>
P. M. Riechers, J. P. Crutchfield. Fraudulent White Noise: Flat power spectra belie arbitrarily complex processes. arXiv:1908.11405v1 [cond-mat.stat-mech] Aug 29, 2019. https://arxiv.org/abs/1908.11405
sabato 5 ottobre 2019
# evol: echolocation, a prime example of convergent evolution
<< Echolocation is a prime example of convergent evolution, the independent gain of similar features in species of different lineages. >>
<< Distantly related species entering similar biological niches often adapt by evolving similar morphological and physiological characters. How much genomic molecular convergence (particularly of highly constrained coding sequence) contributes to convergent phenotypic evolution, such as echolocation in bats and whales, is a long-standing fundamental question. >>
AA << find that the gene set most overrepresented (q-value = 2.2e-3) with convergent substitutions in echolocators, affecting 18 genes, regulates development of the cochlear ganglion, a structure with empirically supported relevance to echolocation. >>
Amir Marcovitz, Yatish Turakhia, et al. A functional enrichment test for molecular convergent evolution finds a clear protein-coding signal in echolocating bats and whales.
PNAS doi: 10.1073/pnas.1818532116 Sep 30, 2019 https://www.pnas.org/content/early/2019/09/27/1818532116
Krista Conger. Scientists uncover genetic similarities among species that use sound to navigate. Stanford University Medical Center. Oct 4, 2019. https://m.phys.org/news/2019-10-scientists-uncover-genetic-similarities-species.html
lunedì 26 agosto 2019
# gst: the hypothesis to optimize multiplicative noise to enhance a signal-to-noise ratio
AA << study simple integrate-and-fire type models with multiplicative noise and consider the transmission of a weak and slow signal, >>
<< The specific question of interest is whether and how the state-dependence of the noise can be optimized with respect to information transmission >>
<< also in a biophysically more relevant situation, multiplicative noise can enhance the signal-to-noise ratio (..) results shed light on a so far unexplored aspect of stochastic signal transmission in neural systems. >>
Jonathan Bauermann Benjamin Lindner. Multiplicative noise is beneficial for the transmission of sensory signals in simple neuron models. Biosystems. Volume 178, Apr 2019, Pages 25-31. doi: 10.1016/ j.biosystems.2019.02.002
https://www.sciencedirect.com/science/article/pii/S0303264718303861
venerdì 17 maggio 2019
# sec: adversarial audio attacks; small sound perturbations to hack a Machine Learning model and remedies
<< Adversarial audio attacks can be considered as a small perturbation unperceptive to human ears that is intentionally added to the audio signal and causes a machine learning model to make mistakes. >>
Mohammad Esmaeilpour, Patrick Cardinal, Alessandro Lameiras Koerich. A Robust Approach for Securing Audio Classification Against Adversarial Attacks. arXiv:1904.10990 [cs.LG] Apr 24, 2019.
https://arxiv.org/abs/1904.10990
Ingrid Fadelli. An approach for securing audio classification against adversarial attacks. May 7, 2019.
https://m.techxplore.com/news/2019-05-approach-audio-classification-adversarial.html
giovedì 28 febbraio 2019
# acad aibot: the real success (also) in scientific research: the automatic search for deviations ...
<< Imagine that you have a lot of data, but you do not really know what you are looking for. So what do you do? In that case you use a computer that automatically searches for deviations. >>
Search engine for new breakthroughs in physics. Radboud University. Feb 19, 2019
https://m.phys.org/news/2019-02-breakthroughs-physics.html
M. Aaboud, G. Aad, et al. A strategy for a general search for new phenomena using data-derived signal regions and its application within the ATLAS experiment. The European Physical Journal C (2019). doi: 10.1140/epjc/s10052-019-6540-y
https://link.springer.com/article/10.1140%2Fepjc%2Fs10052-019-6540-y
lunedì 18 giugno 2018
# geo: low frequency sounds that resemble the shape of the tornillo seismic waves
AA << characterize and interpret a new type of infrasound signal originating from the summit of Volcán Cotopaxi (Ecuador) >>
<< This infrasound waveform is a slowly decaying sinusoid with exceptional low‐frequency (..) and high quality factor (..) and resembles the shape of tornillo seismic waveforms. >>
Johnson JB, Ruiz MC, et al. Infrasound Tornillos Produced by Volcán Cotopaxi's Deep Crater. Geophysical Research Letters. doi: 10.1029/2018GL077766. Jun 13, 2018.
https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018GL077766
Volcano music could help scientists monitor eruptions. American Geophysical Union. Jun 15, 2018.
https://m.phys.org/news/2018-06-volcano-music-scientists-eruptions.html
martedì 27 marzo 2018
# brain: strong signals to connect to consciousness
<< Unexpectedly, our model reveals that only when the signal is strong enough, above a threshold level, the signal reaches a large set of areas of the brain region called the prefrontal cortex, which plays a critical role in high-level cognition >> Madhura Joglekar.
James Devitt. From Signal Propagation to Consciousness: A Potential Connection Discovered. Neuroscience News. Mar 22, 2018.
http://neurosciencenews.com/consciousness-signal-propagation-8674/amp/
Madhura R. Joglekar, Jorge F. Mejias, et al. Inter-areal Balanced Amplification Enhances Signal Propagation in a Large-Scale Circuit Model of the Primate Cortex. Neuron.
doi: 10.1016/j.neuron.2018.02.031.
Mar 22, 2018.
domenica 24 dicembre 2017
# behav: a form of modified oxytocin (a molecule of love), with less adverse effects
<< Oxytocin is clinically used to induce labor, and there is interest in using this peptide to treat social disorders. However, oxytocin triggers adverse cardiovascular side effects >>
AA << generated ligands based on oxytocin with subtle modifications >>
this new molecular form << reduced social fear in mice and induced contractile activity in human myometrial strips without affecting cultured cardiomyocytes >>
Markus Muttenthaler, Asa Andersson, et al. Subtle modifications to oxytocin produce ligands that retain potency and improved selectivity across species. Sci. Signal. 2017; 10 (508): eaan3398. 10.1126/scisignal.aan3398. Dec 05, 2017.
http://stke.sciencemag.org/content/10/508/eaan3398
Scientists create molecule of love with less complications. Dec 12, 2017.
https://m.phys.org/news/2017-12-scientists-molecule-complications.html
sabato 9 settembre 2017
# behav: even more devious than previously thought
<< The common cuckoo, notorious for evading parental duty by hiding her eggs in the nests of other brooding birds, is even more devious than previously thought >>
Scientists expose true extent of cuckoo's cunning. Sept 4, 2017
https://m.phys.org/news/2017-09-scientists-expose-true-extent-cuckoo.html
<< Parasites evolve not only to evade host defences but also to manipulate host behaviour >>
AA << test whether a brood parasitic cuckoo manipulates host perception of predation risk using an acoustic signal—a hawk-like call—that might misdirect host defences and thereby reduce the chance that hosts detect parasitism >>
AA << propose that the female cuckoo chuckle call tricks the hosts into responding vigilantly as if they were exposed to danger from a hawk, instead of from a cuckoo. This would divert host attention from clutch protection to self-protection, and so reduce the chance of the hosts detecting that they have been parasitized >>
Jenny E. York, Nicholas B. Davies. Female cuckoo calls misdirect host defences towards the wrong enemy. Nature Ecology & Evolution. Sept 4, 2017 doi: 10.1038/s41559-017-0279-3
lunedì 7 agosto 2017
# s-evol: a noise effect inside: new species pulsating by chance instead of ...
<< W. Andrew Barr, a visiting assistant professor of anthropology, published a report that says it's possible the pulse of new species could have occurred by chance and might not be directly related to climate change >>
Researcher's paper challenges the claim that the genus Homo originated in response to environmental changes. Aug 4, 2017
https://m.phys.org/news/2017-08-paper-genus-homo-response-environmental.html
W. Andrew Barr. Signal or noise? A null model method for evaluating the significance of turnover pulses. Paleobiology 2017 doi: 10.1017/pab.2017.21 Publ. online: 31 July 2017
also
<< "Nell' Arte tutto e', o dovrebbe essere, un esperimento". Gill Evans. >>
2127 - enigmistiche tonalita'. March 23, 2007
http://inkpi.blogspot.it/2007/03/2127-enigmistiche-tonalita.html