Now that might sound bad, but actually this is a really important developmental process, because gray matter contains cell bodies and connections between cells, the synapses, and this decline in gray matter volume during prefrontal cortex is thought to correspond to synaptic pruning, the elimination of unwanted synapses.
Podería parecer algo malo, pero en realidade trátase dun proceso moi importante do desenvolvemento, porque a materia gris  contén corpos celulares e conexións entre células, as sinapses, e este declive no volume de materia gris  no córtex prefrontal responde á poda sináptica, á eliminación das sinapses irrelevantes.