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Obtaining an electrocorticograms (ECoG) signal requires an invasive procedure in which brain activity is recorded from the cortical surface. In contrast, obtaining electroencephalograms (EEG) recordings requires the non-invasive procedure of recording the brain activity from the scalp surface, which allows EEG recordings to be performed more easily on healthy humans. In this work, a technique previously used to study spatial-temporal patterns of brain activity on animal ECoG was adapted for use on EEG. The main issues are centered on solving the problems introduced by the increment on the interelectrode distance and the procedure to detect stable frames. The results showed that spatial patterns of beta and gamma activity can also be extracted from the EEG signal by using stable frames as time markers for feature extraction. This adapted technique makes it possible to take advantage of the cognitive and phenomenological awareness of a normal healthy subject. 相似文献
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Individuals seek a balance between the demands of their institutions and the dimensions that make up their personalities and determine their needs (Getzels & Guba, 1957). Academic deans are no exception. Indeed, the fit (or lack of it) between the work environment and the unique characteristics of individuals asked to function within a given setting helps determine whether they experience levels of stress that move them forward in their work or suffer debilitating stress that leads to excessive physical and mental strain. This article examines the fit between academic deans and their work environments in the U.S. and Australia as it relates to multiple role stress factors affecting deans. 相似文献
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Timothy B. Folta Walter J. Ferrier 《The Journal of High Technology Management Research》2000,11(2):175-198
This study examines how national culture influences the likelihood and rate of buyouts among R&D equity alliances and joint ventures in the biotechnology industry. We hypothesize that the interaction of specific national culture attributes and cultural differences between alliance partners have an impact on: (1) the amount of endogenous uncertainty surrounding the potential integration of the target firm and (2) the marginal rate of learning in hierarchical versus collaborative governance. Applying a competing hazard model to a sample of 173 joint ventures and minority equity collaborations in the biotechnology industry, we found that investing firms from high power distance and high uncertainty avoidance countries are more likely to buy out their alliance partners. Furthermore, greater cultural distance between alliance partners increases the likelihood of partner buyout when investing firms are from high power distance countries. 相似文献
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