The contribution of stimulus-driven and goal-driven mechanisms to feature-based selection in patients with spatial attention deficits

I Dombrowe, M Donk, Hayley Wright, C N Olivers, Glyn W Humphreys

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    When people search a display for a target defined by a unique feature, fast saccades are predominantly stimulus-driven whereas slower saccades are primarily goal-driven. Here we use this dissociative pattern to assess whether feature-based selection in patients with lateralized spatial attention deficits is impaired in stimulus-driven processing, goal-driven processing, or both. A group of patients suffering from extinction or neglect after parietal damage, and a group of healthy, age-matched controls, were instructed to make a saccade to a uniquely oriented target line which was presented simultaneously with a differently oriented distractor line. We systematically varied the salience of the target and distractor by changing the orientation of background elements, and used a time-based model to extract stimulus-driven (salience) and goal-driven (target set) components of selection. The results show that the patients exhibited reduced stimulus-driven processing only in the contralesional hemifield, while goal-driven processing was reduced across both hemifields.
    Original languageEnglish
    Pages (from-to)249-274
    Number of pages26
    JournalCognitive Neuropsychology
    Volume29
    Issue number3
    DOIs
    Publication statusPublished - 2012

    Keywords

    • Stimulus-driven selection
    • Goal-driven selection
    • Neglect
    • Extinction
    • Eye movements

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