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The response of a natural phytoplankton community from the Godavari River Estuary to increasing CO2 concentration during the pre-monsoon period

✍ Scribed by Haimanti Biswas; Alexander CROS; Kamana Yadav; V. Venkata Ramana; V. Rajendra Prasad; Tamoghna Acharyya; P.V. Raghunadh Babu

Book ID: 113704365
Publisher: Elsevier Science
Year: 2011
Tongue: English
Weight: 933 KB
Volume: 407
Category: Article
ISSN: 0022-0981
DOI: 10.1016/j.jembe.2011.06.027

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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.

✍ Moran, R.J.; Strange, B.A.; Campo, P.; Dolan, R.J. 📂 Article 📅 2009 🏛 Elsevier Science 🌐 English ⚖ 142 KB