Top-down modulation of spatial frequency extraction

Top-down modulation of attention by emotion

Due to their evolutionary salience, threatrelated stimuli, such as snakes, spiders, and angry faces constitute a special class of stimuli believed to capture attention in an involuntary, bottom-up manner. Most research in affective neuroscience has focused on unraveling neural pathways that support this “automatic” capture of attention by emotional stimuli (Vuilleumier and Driver, 2007). Howeve...

Top-down Extraction of Semi-Structured Data

In this paper, we propose an innovative approach to extracting semi-structured data from Web sources. The idea is to collect a couple of example objects from the user and to use this information to extract new objects from new pages or texts. We propose a top-down strategy that extracts complex objects decomposing them in objects less complex, until atomic objects have been extracted. Through e...

Top-down modulation and normal aging.

Normal aging is characterized by cognitive deficits that cross multiple domains and impair the ability of some older individuals to lead productive, high-quality lives. One of the primary goals of research in our laboratories is to study age-related alterations in neural mechanisms that underlie a wide range of cognitive processes so that we may generate a unifying principle of cognitive aging....

Top-down modulation in visual working memory

Top-down modulation of stimulus drive via beta-gamma cross-frequency interaction

SUMMARY Recently, several studies have demonstrated that visual stimulus routing is subserved by inter-areal gamma-band synchronization, whereas top-down influences are mediated by alpha-beta band synchronization. These processes might implement top-down control, if top-down and bottom-up mediating rhythms are coupled through cross-frequency interaction. To test this possibility, we investigate...