Vision: Does top-down processing help us to see?

Vision: Does top-down processing help us to see?

Anatomical studies of the visual cortex have identified massive back-projecting pathways. Theoretical studies suggest how such pathways may play important roles in vision by mediating 'top-down' processing, in which information from a relatively high level is fed back to early visual stages.

High-level Vision: Top-down Processing in Neurally Inspired Architectures

Does Signal Degradation Affect Top-Down Processing of Speech?

Speech perception is formed based on both the acoustic signal and listeners' knowledge of the world and semantic context. Access to semantic information can facilitate interpretation of degraded speech, such as speech in background noise or the speech signal transmitted via cochlear implants (CIs). This paper focuses on the latter, and investigates the time course of understanding words, and ho...

Event-Related Potentials of Bottom-Up and Top-Down Processing of Emotional Faces

Introduction: Emotional stimulus is processed automatically in a bottom-up way or can be processed voluntarily in a top-down way. Imaging studies have indicated that bottom-up and top-down processing are mediated through different neural systems. However, temporal differentiation of top-down versus bottom-up processing of facial emotional expressions has remained to be clarified. The present st...

Top-down processing mediated by interareal synchronization.

Perception and cortical responses are not only driven "bottom-up" by the external stimulus but are altered by internal constraints such as expectancy or the current behavioral goal. To investigate neurophysiological mechanisms of such top-down effects, we analyzed the temporal interactions of neurons on different levels of the cortical hierarchy during perception of stimuli with varying behavio...