
If you’ve ever assigned a special ringtone to a crush, you know the instant hit of dopamine that occurs the instant it goes off. You might also know the feeling when another ringtone goes off for a person you are avoiding.

If you’ve ever assigned a special ringtone to a crush, you know the instant hit of dopamine that occurs the instant it goes off. You might also know the feeling when another ringtone goes off for a person you are avoiding.