Selecting category specific visual information: Top-down and bottom-up control of object based attention

Consciousness and Cognition
Corrado Corradi-Dell'AcquaRalph Weidner

Abstract

The ability to select, within the complexity of sensory input, the information most relevant for our purposes is influenced by both internal settings (i.e., top-down control) and salient features of external stimuli (i.e., bottom-up control). We here investigated using fMRI the neural underpinning of the interaction of top-down and bottom-up processes, as well as their effects on extrastriate areas processing visual stimuli in a category-selective fashion. We presented photos of bodies or buildings embedded into frequency-matched visual noise to the subjects. Stimulus saliency changed gradually due to an altered degree to which photos stood-out in relation to the surrounding noise (hence generating stronger bottom-up control signals). Top-down settings were manipulated via instruction: participants were asked to attend one stimulus category (i.e., "is there a body?" or "is there a building?"). Highly salient stimuli that were inconsistent with participants' attentional top-down template activated the inferior frontal junction and dorsal parietal regions bilaterally. Stimuli consistent with participants' current attentional set additionally activated insular cortex and the parietal operculum. Furthermore, the extrastriate body a...Continue Reading

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Citations

Mar 30, 2016·Neuropsychologia·Sara HayamaThomas Ernst
Jun 13, 2015·Consciousness and Cognition·Bruno G BreitmeyerMichael Niedeggen
Dec 7, 2019·Journal of Geriatric Psychiatry and Neurology·Akira KuritaMegumi Suzuki
Nov 14, 2019·Brain Sciences·Andrea Orlandi, Alice Mado Proverbio
Jun 21, 2020·Neuropsychologia·Andrea Orlandi, Alice Mado Proverbio
Jul 26, 2021·Journal of Psychiatric Research·Alfredo L SklarDean F Salisbury

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