The Compendium of Caraka 1.8.5

1.8.5

svārthendriyārthasaṅkalpavyabhicaraṇāccānekamekasmin puruṣe sattvaṃ rajastamaḥsattvaguṇayogācca na cānekatvaṃ nahyekaṃ hyekakālamanekeṣu pravartate tasmānnaikakālā sarvendriyapravṛttiḥ //

And because of the variations in resolve regarding its own objects and the objects of the senses, and because of its union with the qualities of rajas, tamas, and sattva, the mind appears manifold in a single person; yet it is not manifold, for a single [mind] does not operate simultaneously on manifold [objects]. Therefore, the functioning of all the senses is not simultaneous.