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Articles, Behavioral/Cognitive

Disrupting Prefrontal Cortex Prevents Performance Gains from Sensory-Motor Training

Hannah L. Filmer, Jason B. Mattingley, René Marois and Paul E. Dux
Journal of Neuroscience 20 November 2013, 33 (47) 18654-18660; DOI: https://doi.org/10.1523/JNEUROSCI.2019-13.2013
Hannah L. Filmer
1School of Psychology and
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Jason B. Mattingley
1School of Psychology and
2Queensland Brain Institute, The University of Queensland, St Lucia, Queensland 4072, Australia, and
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René Marois
3Department of Psychology, Vanderbilt University, Nashville, Tennessee 37235
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Paul E. Dux
1School of Psychology and
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Abstract

Humans show large and reliable performance impairments when required to make more than one simple decision simultaneously. Such multitasking costs are thought to largely reflect capacity limits in response selection (Welford, 1952; Pashler, 1984, 1994), the information processing stage at which sensory input is mapped to a motor response. Neuroimaging has implicated the left posterior lateral prefrontal cortex (pLPFC) as a key neural substrate of response selection (Dux et al., 2006, 2009; Ivanoff et al., 2009). For example, activity in left pLPFC tracks improvements in response selection efficiency typically observed following training (Dux et al., 2009). To date, however, there has been no causal evidence that pLPFC contributes directly to sensory-motor training effects, or the operations through which training occurs. Moreover, the left hemisphere lateralization of this operation remains controversial (Jiang and Kanwisher, 2003; Sigman and Dehaene, 2008; Verbruggen et al., 2010). We used anodal (excitatory), cathodal (inhibitory), and sham transcranial direct current stimulation (tDCS) to left and right pLPFC and measured participants' performance on high and low response selection load tasks after different amounts of training. Both anodal and cathodal stimulation of the left pLPFC disrupted training effects for the high load condition relative to sham. No disruption was found for the low load and right pLPFC stimulation conditions. The findings implicate the left pLPFC in both response selection and training effects. They also suggest that training improves response selection efficiency by fine-tuning activity in pLPFC relating to sensory-motor translations.

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The Journal of Neuroscience: 33 (47)
Journal of Neuroscience
Vol. 33, Issue 47
20 Nov 2013
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Disrupting Prefrontal Cortex Prevents Performance Gains from Sensory-Motor Training
Hannah L. Filmer, Jason B. Mattingley, René Marois, Paul E. Dux
Journal of Neuroscience 20 November 2013, 33 (47) 18654-18660; DOI: 10.1523/JNEUROSCI.2019-13.2013

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Disrupting Prefrontal Cortex Prevents Performance Gains from Sensory-Motor Training
Hannah L. Filmer, Jason B. Mattingley, René Marois, Paul E. Dux
Journal of Neuroscience 20 November 2013, 33 (47) 18654-18660; DOI: 10.1523/JNEUROSCI.2019-13.2013
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