Which specific process determines where consciousness will alight? As the title indicates, I don't know how the mind "picks" which sensation to focus on. Considering the huge amount of sense-data being received by the mind each moment, which condition directs consciousness to alight in a specific range of the whole set of sense-data?

I've read that kamma influences where will the "seed" of consciousness grow. But what does this mean, exactly?

In some sources, I've read that "past" namarupa gives to consciousness the content to be known in the present, which allows contact to arise. If that's the case, can we say that where we've placed our attention (as a factor of nama in namarupa) in the past determines where will consciousness will alight in each moment?

EDIT: Some may argue that the intensity of an stimulus might be the main factor in determining where will condition alight. But what will happen when multiple sense-objects have a similar "strength", or when such "strength" is not objectively defined? For instance, what happens when someone is listening to some music? A singer attention might "fall" on the qualities of the singer's voice in the song; a bassist may auomatically pay attention to the bass and the technique behind the player; and a "casual" listener might just hear and pay attention to the overall song. 

In sum, I'm asking about the processes that might "filter" the whole range of sense-data input to be processed in the mind, and that determine which portion of that amount of information might be felt as a vedana.

Thanks in advance for your time.

Kind regards!
Here seems to be the answer, according to the following sutta:
SN 12,38 - Cetanā Sutta

At Savatthī. “Bhikkhus, what one intends, and what one plans, and whatever one has a tendency towards: this becomes a basis for the maintenance of consciousness. When there is a basis there is a support for the establishing of consciousness. When consciousness is established and has come to growth, there is the production of future renewed existence. When there is the production of future renewed existence, future birth, aging-and-death, sorrow, lamentation, pain, displeasure, and despair come to be. Such is the origin of this whole mass of suffering.
“If, bhikkhus, one does not intend, and one does not plan, but one still has a tendency towards something, this becomes a basis for the maintenance of consciousness. When there is a basis, there is a support for the establishing of consciousness…. Such is the origin of this whole mass of suffering.
“But, bhikkhus, when one does not intend, and one does not plan, and one does not have a tendency towards anything, no basis exists for the maintenance of consciousness. When there is no basis, there is no support for the establishing of consciousness. When consciousness is unestablished and does not come to growth, there is no production of future renewed existence. When there is no production of future renewed existence, future birth, aging-and-death, sorrow, lamentation, pain, displeasure, and despair cease. Such is the cessation of this whole mass of suffering.”

Also, in AN 3,77 - Dutiyabhava Sutta

&quot;Thus kamma is the field, consciousness the seed, and craving the moisture. The intention &amp; aspiration of living beings hindered by ignorance &amp; fettered by craving is established in/tuned to a lower property. Thus there is the production of renewed becoming in the future.&quot;

Thanks to everyone for your answers so far. I'd appreciate any other answer!
Kind regards!