Re-entrant or feedback pathways between cortical areas carry rich and varied information
about behavioural context, including attention, expectation, perceptual tasks, working …

The scale at which humans can handle complex social situations is massively increased
compared to other animals. However, the neural substrates of this scaling remain poorly …

Whereas gamma-band neuronal oscillations clearly appear integral to visual attention, the
role of lower-frequency oscillations is still being debated. Mounting evidence indicates that a …

A number of studies have shown that pupil size increases transiently during effortful
decisions. These decision-related changes in pupil size are mediated by central …

The goal of perceptual systems is to allow organisms to adaptively respond to ecologically
relevant stimuli. Because all perceptual inputs are ambiguous, perception needs to rely on …

Acetylcholine is a ubiquitous cortical neuromodulator implicated in cognition. In order to
understand the potential for acetylcholine to play a role in visual attention, we studied …

Vision is widely used as a model system to gain insights into how sensory inputs are
processed and interpreted by the brain. Historically, careful quantification and control of …

Cortical activity was measured with functional magnetic resonance imaging (fMRI) while
human subjects viewed 12 stimulus colors and performed either a color-naming or diverted …

Attention is thought to enhance perceptual performance at attended locations through top-
down attention signals that modulate activity in visual cortex. Here, we show that activity in …

The frontal lobes control wide-ranging cognitive functions; however, functional subdivisions
of human frontal cortex are only coarsely mapped. Here, functional magnetic resonance …