Discrimination of single features and conjunctions by children

Stimuli that are discriminated by a conjunction of features can show more rapid early processing in adults. To determine how this facilitation effect develops, the processing of visual features and their conjunction was examined in 7–12-year-old children. The children completed a series of tasks in...

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Veröffentlicht in:International journal of psychophysiology 2003-12, Vol.51 (1), p.85-95
Hauptverfasser: Taylor, M.J., Chevalier, H., Lobaugh, N.J.
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container_title International journal of psychophysiology
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creator Taylor, M.J.
Chevalier, H.
Lobaugh, N.J.
description Stimuli that are discriminated by a conjunction of features can show more rapid early processing in adults. To determine how this facilitation effect develops, the processing of visual features and their conjunction was examined in 7–12-year-old children. The children completed a series of tasks in which they made a target–non-target judgement as a function of shape only, colour only or shape and colour features, while event-related potentials were recorded. To assess early stages of feature processing the posteriorly distributed P1 and N1 were analysed. Attentional effects were seen for both components. P1 had a shorter latency and P1 and N1 had larger amplitudes to targets than non-targets. Task effects were driven by the conjunction task. P1 amplitude was largest, while N1 amplitude was smallest for the conjunction targets. In contrast to larger left-sided N1 in adults, N1 had a symmetrical distribution in the children. N1 latency was shortest for the conjunction targets in the 9–10-year olds and 11–12-year olds, demonstrating facilitation in children, but which continued to develop over the pre-teen years. These data underline the sensitivity of early stages of processing to both top-down modulations and the parallel binding of non-spatial features in young children. Furthermore, facilitation effects, increased speed of processing when features need to be conjoined, mature in mid-childhood, arguing against a hierarchical model of visual processing, and supporting a rapid, integrated facilitative model.
doi_str_mv 10.1016/S0167-8760(03)00155-7
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subjects Aging - psychology
Attention - physiology
Binding
Child
Development
Discrimination (Psychology) - physiology
Electrodes
Electroencephalography
Event-related potentials
Facilitation
Female
Form Perception - physiology
Humans
Male
Photic Stimulation
Visual attention
Visual Perception - physiology
title Discrimination of single features and conjunctions by children
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