7,634 results found
    1. Neuroscience

    Dynamic top-down biasing implements rapid adaptive changes to individual movements

    Lucas Y Tian, Timothy L Warren ... Michael S Brainard
    Multi-area recordings reveal how communication between two songbird brain areas conveys a top-down bias that adaptively modifies ongoing singing to support context-specific vocal learning.
    1. Neuroscience

    Dissociable laminar profiles of concurrent bottom-up and top-down modulation in the human visual cortex

    Samuel JD Lawrence, David G Norris, Floris P de Lange
    Neural activity in the visual system is increased in different layers of the neocortex for bottom-up and top-down modulations.
    1. Neuroscience

    Bottom-up and top-down influences at untrained conditions determine perceptual learning specificity and transfer

    Ying-Zi Xiong, Jun-Yun Zhang, Cong Yu
    Perceptual learning is specific because of the absence of bottom-up stimulation and top-down modulation at the untrained conditions.
    1. Computational and Systems Biology

    The bottom-up and top-down processing of faces in the human occipitotemporal cortex

    Xiaoxu Fan, Fan Wang ... Sheng He
    Both bottom-up and top-down processing are involved in the occipital-temporal face network, with the top-down modulation more extensively engaged when available information is sparse in the face images.
    1. Neuroscience

    Synaptic mechanisms of top-down control in the non-lemniscal inferior colliculus

    Hannah M Oberle, Alexander N Ford ... Pierre F Apostolides
    Optogenetic and electrophysiological experiments show how a behaviorally relevant 'feedback' pathway from auditory cortex controls neural activity in the inferior colliculus, an auditory midbrain region important for processing complex time-varying sounds such as speech.
    1. Structural Biology and Molecular Biophysics

    Top-down machine learning approach for high-throughput single-molecule analysis

    David S White, Marcel P Goldschen-Ohm ... Baron Chanda
    A new analysis algorithm (DISC) enables accurate analysis of data from high-throughput single-molecule paradigms and reveals a non-cooperative binding mechanism of cyclic nucleotide-binding domains from HCN ion channels.
    1. Neuroscience

    Push-pull competition between bottom-up and top-down auditory attention to natural soundscapes

    Nicholas Huang, Mounya Elhilali
    Everyday soundscapes dynamically engage attention towards target sounds or salient ambient events, with both attentional forms engaging the same fronto-parietal network but in a push-pull competition for limited neural resources.
    1. Computational and Systems Biology
    2. Neuroscience

    Bottom-up and top-down computations in word- and face-selective cortex

    Kendrick N Kay, Jason D Yeatman
    A computational model reveals how response properties of category-selective regions in the visual cortex reflect both bottom-up stimulus-driven signals and top-down attentional signals from the parietal cortex.
    1. Neuroscience

    Paradoxical response reversal of top-down modulation in cortical circuits with three interneuron types

    Luis Carlos Garcia del Molino, Guangyu Robert Yang ... Xiao-Jing Wang
    Computational simulations and mathematical derivations reveal why the response of neural populations to external modulation is sometimes reversed with respect to what intuition would lead to believe in cortical circuits with multiple types of inhibitory neurons.
    1. Neuroscience

    The paraventricular thalamus is a critical mediator of top-down control of cue-motivated behavior in rats

    Paolo Campus, Ignacio R Covelo ... Shelly B Flagel
    A top-down circuit generating from the prelimbic cortex and projecting to the paraventricular nucleus of the thalamus mediates individual differences in cue-elicited responding by affecting subcortical dopamine-dependent incentive learning.

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