estarían activando
-they/you would be activating
Conditional progressiveellos/ellas/ustedesconjugation ofactivar.

activar

Y si cierran sus ojos serán capaces de navegarlo mentalmente, estarían activando el sistema dorsal si lo hicieran.
And if you closed your eyes you'd be able to mentally navigate it. You'd be activating the dorsal stream if you did that.
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rye