Attempts to decode what has become known as the (singular) neural correlate of
consciousness (NCC) suppose that consciousness is a single unified entity, a belief that …

In conditions of constant illumination, the eye pupil diameter indexes the modulation of
arousal state and responds to a large breadth of cognitive processes, including mental effort …

The mainstays of brain imaging techniques have been positron emission tomography (PET),
functional magnetic resonance imaging (fMRI), magnetoencephalography (MEG), and event …

We investigated the processing effort during visual search and counting tasks using a pupil
dilation measure. Search difficulty was manipulated by varying the number of distractors as …

The muscles that control the pupil are richly innervated by the autonomic nervous system.
While there are central pathways that drive pupil dilations in relation to arousal, there is no …

The influence of task requirements on the fast visual processing of natural scenes was
studied in 14 human subjects performing in alternation an “animal” categorization task and a …

The link between arousal and pupil dilation is well studied, but it is less known that other
cognitive processes can trigger pupil responses. Here we present evidence that pupil …

Background: When simultaneous visual events appear to occur at different times, the
discrepancy has generally been ascribed to time differences in neural transmission or …

The function of the iris and its response to light in man has been of great interest to both
physiologists and neurologists who wanted to establish the neural pathways involved in the …

Performance in a reaction time task can be strongly influenced by the physical properties of
the stimuli used (eg, position and intensity). The reduction in reaction time observed with …