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Differential Modulation of Visual Object Processing in Dorsal and Ventral Stream by Stimulus Visibility by Karin Ludwig; Philipp Sterzer; Norbert Kathmann; Guido Hesselmann is a Neuroscience article available to read on EtoBox.

What is Differential Modulation of Visual Object Processing in Dorsal and Ventral Stream by Stimulus Visibility about?

As a functional organization principle in cortical visual information processing, the influential ‘two visual systems’ hypothesis proposes a division of labor between a dorsal “vision-for-action” and a ventral “vision-for-perception” stream. A core assumption of this model is that the two visual streams are differentially involved in visual awareness: ventral stream processing is closely linked to awareness while dorsal stream processing is not. In this functional magnetic resonance imaging (fMRI) study with human observers, we directly probed the stimulus-related information encoded in fMRI response patterns in both visual streams as a function of stimulus visibility. We parametrically modulated the visibility of face and tool stimuli by varying the contrasts of the masks in a continuous flash suppression (CFS) paradigm. We found that visibility – operationalized by objective and subjective measures – decreased proportionally with increasing log CFS mask contrast. Neuronally, this relationship was closely matched by ventral visual areas, showing a linear decrease of stimulus-related information with increasing mask contrast. Stimulus-related information in dorsal areas also showed

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Author

Karin Ludwig; Philipp Sterzer; Norbert Kathmann; Guido Hesselmann

Publisher

Elsevier BV

Published

2016

Language

EN

Field

Neuroscience (Life Sciences)