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Fast oscillations display sharper orientation tuning than slower components of the same recordings in striate cortex of the awake monkey.

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Title: Fast oscillations display sharper orientation tuning than slower components of the same recordings in striate cortex of the awake monkey.
Authors: Frien, Axel (AUTHOR), Eckhorn, Reinhard (AUTHOR), Bauer, Roman (AUTHOR), Woelbern, Thomas (AUTHOR), Gabriel, Andreas (AUTHOR)
Source: European Journal of Neuroscience. Apr2000, Vol. 12 Issue 4, p1453-1465. 13p.
Subjects: Oscillations, Visual cortex
Abstract: Abstract We wanted to know whether fast oscillations (≈ 30–80 Hz) in striate cortex of awake monkeys show sharper orientation selectivity than (i) slower components, including spike rate modulations, and (ii) broad-band signals of the same recordings. As fast oscillations are probably of cortical origin this may further clarify whether cortical network mechanisms are substantially involved in generating orientation selectivity. We recorded multi unit activity (MUA) and local field potentials (LFP, 1–140 Hz) by the same microelectrodes from upper layers of macaque striate cortex during visual stimulation with grating textures of different orientations. An orientation index (OI) was derived from the cortical responses in three frequency ranges (low, 0–11.7 Hz; medium, 11.7–31.3 Hz; and fast oscillations, 31.3–62.5 Hz) and for the broad-band LFP and MUA power. (i) Both LFP and MUA fast oscillations reveal a higher orientation index than signal components in the low and medium frequency ranges. (ii) For MUA the orientation index was significantly higher with fast oscillations than for the lower frequency ranges and the initial broad-band transient responses. (iii) LFPs show a significantly higher orientation index only for the fast oscillations during sustained activation compared with their broad-band power during the transient responses. Thus, our main result is the sharper orientation tuning of fast oscillations in spike activities of local populations compared with slower components of the same broad-band recordings. As fast oscillations occur synchronized in the awake monkey's striate cortex we assume that they have enhanced probability of activating successive stages of visual processing and hence contribute to the perception of orientation. [ABSTRACT FROM AUTHOR]
Copyright of European Journal of Neuroscience is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Fast oscillations display sharper orientation tuning than slower components of the same recordings in striate cortex of the awake monkey.
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  Data: <searchLink fieldCode="AR" term="%22Frien%2C+Axel%22">Frien, Axel</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Eckhorn%2C+Reinhard%22">Eckhorn, Reinhard</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bauer%2C+Roman%22">Bauer, Roman</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Woelbern%2C+Thomas%22">Woelbern, Thomas</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gabriel%2C+Andreas%22">Gabriel, Andreas</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22European+Journal+of+Neuroscience%22">European Journal of Neuroscience</searchLink>. Apr2000, Vol. 12 Issue 4, p1453-1465. 13p.
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  Data: Abstract We wanted to know whether fast oscillations (≈ 30–80 Hz) in striate cortex of awake monkeys show sharper orientation selectivity than (i) slower components, including spike rate modulations, and (ii) broad-band signals of the same recordings. As fast oscillations are probably of cortical origin this may further clarify whether cortical network mechanisms are substantially involved in generating orientation selectivity. We recorded multi unit activity (MUA) and local field potentials (LFP, 1–140 Hz) by the same microelectrodes from upper layers of macaque striate cortex during visual stimulation with grating textures of different orientations. An orientation index (OI) was derived from the cortical responses in three frequency ranges (low, 0–11.7 Hz; medium, 11.7–31.3 Hz; and fast oscillations, 31.3–62.5 Hz) and for the broad-band LFP and MUA power. (i) Both LFP and MUA fast oscillations reveal a higher orientation index than signal components in the low and medium frequency ranges. (ii) For MUA the orientation index was significantly higher with fast oscillations than for the lower frequency ranges and the initial broad-band transient responses. (iii) LFPs show a significantly higher orientation index only for the fast oscillations during sustained activation compared with their broad-band power during the transient responses. Thus, our main result is the sharper orientation tuning of fast oscillations in spike activities of local populations compared with slower components of the same broad-band recordings. As fast oscillations occur synchronized in the awake monkey's striate cortex we assume that they have enhanced probability of activating successive stages of visual processing and hence contribute to the perception of orientation. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of European Journal of Neuroscience is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1046/j.1460-9568.2000.00025.x
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      – Code: eng
        Text: English
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              Text: Apr2000
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              Y: 2000
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