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| GUIC,ELIANA; CARRASCO,XIMENA; RODRÍGUEZ,EUGENIO; ROBLES,IGNACIO; MERZENICH,MICHAEL M. |
| In the present experiments we studied exclusive and overlapping cortical representational áreas of the vibrissae in layer IV cells, across the entire barrel subfield of the rat somatosensory cortex, looking for evidences that would challenge the present assumptions of homogeneity and symmetry among cortical columns in this sensorial system. Our main findings were that in layer IV of the rat barrel cortex: A) Size of vibrissae cortical representational áreas (X=0.4174mm²; SD=0.025) was not homo geneous, vibrissae in dorsal rows (A-B) had significantly smaller áreas than those in ventral rows (D-E), a pattern that repeated itself in ares 1-4. B) This difference arises from vibrissal representational overlap, and not from variations in exclusive zones, which... |
| Tipo: Journal article |
Palavras-chave: Cortical representation; Barrel cortex; Evoked activity; Rat -somatosensory cortex; Spatial configuration. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000400011 |
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| 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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