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Effect of Psychostimulants on Distinct Attentional Parameters in Attentional Deficit/Hyperactivity Disorder 48
LÓPEZ,JAVIER; LÓPEZ,VLADIMIR; ROJAS,DANIEL; CARRASCO,XIMENA; ROTHHAMMER,PAULA; GARCÍA,RICARDO; ROTHHAMMER,FRANCISCO; ABOITIZ,FRANCISCO.
Although there is extensive literature about the effects of stimulants on sustained attention tasks in attentional deficit/hyperactivity disorder (ADHD), little is known about the effect of these drugs on other attentional tasks involving different neural systems. In this study we measured the effect of stimulants on ADHD children, both in the electroencephalographic (EEG) activity during sustained attentional tasks and in psychometric performance during selective attentional tasks. These tasks are known to rely on different cortical networks. Our results in children medicated with 10 mg of d-amphetamine administered 60 min before the study indicate (i) a significant increase in amplitude but not latency of the P300 component of the event-related potential...
Tipo: Journal article Palavras-chave: Attentional deficit; EEG; Event-related potentials; Hyperactivity; Stroop; P300.
Ano: 2004 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000300010
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Long distance communication in the human brain: timing constraints for inter-hemispheric synchrony and the origin of brain lateralization 48
ABOITIZ,FRANCISCO; LÓPEZ,JAVIER; MONTIEL,JUAN.
Analysis of corpus callosum fiber composition reveals that inter-hemispheric transmission time may put constraints on the development of inter-hemispheric synchronic ensembles, especially in species with large brains like humans. In order to overcome this limitation, a subset of large-diameter callosal fibers are specialized for fast inter-hemispheric transmission, particularly in large-brained species. Nevertheless, the constraints on fast inter-hemispheric communication in large-brained species can somehow contribute to the development of ipsilateral, intrahemispheric networks, which might promote the development of brain lateralization.
Tipo: Journal article Palavras-chave: Axon; Brain lateralization; Corpus callosum; Inter-hemispheric transfer; Synchrony; Vision.
Ano: 2003 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602003000100007
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