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THE SEARCH FOR AN ETHICAL SACRAMENT: FROM BONHOEFFER TO CRITICAL SOCIAL THEORY

✍ Scribed by WAYNE WHITSON FLOYD

Book ID: 115227817
Publisher: John Wiley and Sons
Year: 1991
Tongue: English
Weight: 241 KB
Volume: 7
Category: Article
ISSN: 0266-7177
DOI: 10.1111/j.1468-0025.1991.tb00242.x

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Theta bandwidth determines human visual

Theta bandwidth determines human visual working memory capacity Human visual short term memory (VSTM) is capacity limited1. The neurophysiological basis for this limitation is, however, currently unknown. Here we apply the principle of efficient information transfer, derived from communications theory, to provide a mechanistic account of VSTM capacity. Shannon's information theory states that to increase the capacity of information encoded along a frequency axis, it is more efficient to expand the bandwidth than to increase the transmitted power for a given level of noise2. By applying Shannon's principles to human magnetoencephalography (MEG) recordings of oscillatory activity in the theta band during a VSTM task, we demonstrate that increasing memory load to capacity induces a parametric shift in theta frequency band during the delay period, from 4 to 8 Hz, in a right fronto-parietal network. Critically, we show that an individual's VSTM capacity is proportional to that parametric shift. Thus, the adherence of cortical neuronal oscillations to a fundamental principle of efficient information transfer appears to underlie the limited nature of visual representation in short-term memory.

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📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 43 KB 👁 1 views

Intended as a primary or ancillary textbook in courses on sociological theory, this collection could serve equally well in courses on the history of sociology, the social sciences, or social psychology. It includes a selection from one of the best-known works of each of the following sixteen mid-nin