You have all necessary cognition to process and use the sensation, not just being able to sense it.

For example, if you choose Hal’s auditory sensory ability, you won’t just be overloaded with a quintillion different sounds. You’ll have the necessary WMI, PSI, PRI, VSI to take all that sensory data in, organise it, and visualise whatever you hear.

But that FSIQ buff ONLY applies to the sensory ability itself. It isn’t transferable to anything else.

Ayanokoji’s visual sensory without perfect memory

(Not sure if this is the exact feat) Ayanokoji recalls a name from a nametag he saw from a distance in a crowd in his peripheral vision. He wasn’t trying to look for that name or anything, but he saw it well enough and noticed it nonetheless.

You would essentially perceive visual details at that level constantly. But you wouldn’t log it into your mind perfectly as you would a filing cabinet, like Koji’s PMH.

Hal’s auditory sensory and echolocation

Feats:

- Was able to sense and visualise a handkerchief almost completely flattened placed on the floor in a soundproofed room.
- Was able to hear Gonen’s heartbeat, accurately counting its rise from 65 to 100 beats per minute.

Hannibal’s olfactory sensory

- He famously detects Bella Crawford’s cancer and Will Graham's encephalitis, describing the latter as having "heat" and a "fevered sweetness".
- He identifies people by their scent (e.g., [Will Graham's aftershave) and can identify if someone has visited a specific, scent-heavy location like a pharmacy.
- able to smell the perfume that Clarice had used the day before, through a poorly ventilated plate glass window no less.
- able to tell that a murder victim had been in a cornfield even though the body had been submerged in water overnight. He also claims that he was able to tell that his teacher had stomach cancer before he (the teacher) was aware of it.