The "Heartbeat Effect"

[Ranehiku]

In various media, I saw this visual trick which I like to call the "Heartbeat Effect".

To put it simply, it's a visual trick where a character gets a "pulsation" effect as a heartbeat sound, presumably the character's, is heard.

So I was wondering, what does the Heartbeat Effect signify in moments in media?

[nrL]

comedy

[ZombieWolf2508]

I would assume it's supposed to be fear.

[animeyay]

Could be shock, love, fear, or any other kind of stimulating emotion.

[DOOM!]

Screw you post, OP, let's talk about the "Herbal Effect".