Organization of spatial frequency in cat striate cortex

Zhang, Jingjing; Zhang, Xian; Hu, Xu; Wu, Wei; Yang, Yupeng

doi:10.1016/j.neuroscience.2017.08.021

Cited by 4 publications

(2 citation statements)

References 43 publications

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“…Stimuli consisted of drifting sinusoidal gratings with spatial and temporal frequencies set at 0.3 cpd and 3 Hz for all stimuli, respectively. The spatial and temporal frequencies were inside the response range of neurons from both areas 17 [ 22 , 23 ] and 21a [ 24 , 25 , 26 ]. Trials were fully randomized, and each stimulus was presented 15 times.…”

Section: Methodsmentioning

confidence: 99%

Pulvinar Modulates Synchrony across Visual Cortical Areas

Cortes

Souza

Casanova

2020

Vision

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The cortical visual hierarchy communicates in different oscillatory ranges. While gamma waves influence the feedforward processing, alpha oscillations travel in the feedback direction. Little is known how this oscillatory cortical communication depends on an alternative route that involves the pulvinar nucleus of the thalamus. We investigated whether the oscillatory coupling between the primary visual cortex (area 17) and area 21a depends on the transthalamic pathway involving the pulvinar in cats. To that end, visual evoked responses were recorded in areas 17 and 21a before, during and after inactivation of the pulvinar. Local field potentials were analyzed with Wavelet and Granger causality tools to determine the oscillatory coupling between layers. The results indicate that cortical oscillatory activity was enhanced during pulvinar inactivation, in particular for area 21a. In area 17, alpha band responses were represented in layers II/III. In area 21a, gamma oscillations, except for layer I, were significantly increased, especially in layer IV. Granger causality showed that the pulvinar modulated the oscillatory information between areas 17 and 21a in gamma and alpha bands for the feedforward and feedback processing, respectively. Together, these findings indicate that the pulvinar is involved in the mechanisms underlying oscillatory communication along the visual cortex.

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Section: Methodsmentioning

confidence: 99%

Pulvinar Modulates Synchrony across Visual Cortical Areas

Cortes

Souza

Casanova

2020

Vision

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“…[ 1–3 ] They are filter feeders and have highly permeable membranes, where microorganisms and organic particles are filtered out, ingested, or become incorporated. Sponges harbor a diverse community of macroscopic and microscopic symbionts, [ 4–7 ] which can impact the host ecology and result in the production of secondary metabolites. [ 8 ] The sponge‐symbiont consortium is known to be one of the richest sources of marine natural products, [ 9–11 ] and carotenoids are well represented among them [ 12–20 ] with their characteristic light scattering and light absorbing properties.…”

Section: Introductionmentioning

confidence: 99%

Coloration patterns of marine sponges assessed by vibrational spectroscopy

Maia¹,

Gonzaga²,

Campos³

et al. 2021

J Raman Spectroscopy

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Sponges (phylum Porifera) are colorful filter feeding animals that harbor a large number of microorganisms in their tissue-like structures in a symbiotic relationship. The colors exhibited by sponges implied in physiological and ecological process can be biosynthetically derived or acquired from the symbiont. In this work, the coloration pattern of nine species of sponges collected in the littoral of Rio de Janeiro State, Brazil, was identified by vibrational spectroscopy. An unprecedented study combining Raman and infrared spectroscopies revealed that carotenoids are responsible for the color of red-orange, green, and blue species, while melanin was addressed to the black species. The analysis of the spectral features of Raman bands presented in both in situ and crude extracts samples showed that carotenoids may occur as a mixture of isomers or alternatively, be bonded to proteins (carotenoproteins). It is noteworthy that the carotenoid-based pigmentation in sponges is provided by the symbionts, which may be implied to the evolutionary and ecological success of this most ancient animal. The application of vibrational spectroscopy mainly in the in situ mode can be a valuable tool in the identification of structural differentiation of carotenoids in the microbiome of sponges collected in different environments.

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A multi-scale neurodynamic implementation of incremental grouping

Domijan

Marić

2022

Vision Research

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Organization of spatial frequency in cat striate cortex

Cited by 4 publications

References 43 publications

Pulvinar Modulates Synchrony across Visual Cortical Areas

Pulvinar Modulates Synchrony across Visual Cortical Areas

Coloration patterns of marine sponges assessed by vibrational spectroscopy

A multi-scale neurodynamic implementation of incremental grouping

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