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Feature-directed attention has been recently studied in various psychophysical, electrophysiological, and imaging studies. Convincing evidence has been obtained for its global effectiveness, but there is a debate about the processing fate of non-attended target features. A number of studies demonstrated feature-directed attention being associated with(More)
We report findings from several variants of a psychophysical experiment using an acceleration detection task in which we tested predictions derived from recent neurophysiological data obtained from monkey area MT. The task was designed as a Posner paradigm and required subjects to detect the speed-up of a moving bar, cued with 75% validity. Displays varied(More)
Selective visual attention is known to be associated with characteristic modulations of neuronal activity in early visual cortex, but there is only rare evidence showing that these neuronal modulations are directly related to attention-dependent behavioral improvements. Here, we describe a strong, transient increase in the response of neurons in the(More)
In monkeys, long-term recordings with chronically implanted microelectrodes frequently suffer from a continuously decreasing probability to record single units or even small multiunit clusters. This problem is associated with two technical limitations of the available devices: first, restrictions for electrode movement, and second, absent possibility to(More)
Directing attention to a specific feature of an object has been linked to different forms of attentional modulation. Object-based attention theory founds on the finding that even task-irrelevant features at the selected object are subject to attentional modulation, while feature-based attention theory proposes a global processing benefit for the selected(More)
Visual perception depends on the effective prioritization of visual information in order to concur with the current behavioral context. Depending on the context's requirements, it is important to facilitate the processing of a certain feature (e.g. motion) in some situations, while in others another feature (e.g. color) is more crucial. We here address the(More)
A new type of recording chamber with an easy-to-exchange microdrive array for chronic recordings in macaque monkeys A new type of recording chamber with an easy-to-exchange microdrive array for chronic recordings in macaque monkeys.—In monkeys, long-term recordings with chronically implanted microelectrodes frequently suffer from a continuously decreasing(More)
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