Why do we tend to talk louder (but we don't know) when we are using a headphone?

Question

My friends are listening to music with headphones. When I ask them something, they talk to me very loud as if they were shouting at me. However they don't know how loud they talk.

Answer 1

Outside noise is muffled and we do not hear ourselfs as we speak in a normal tone,so we raise our voice to hear ourselfs and it comes accross as shouting.

Answer 2

We regulate how loud we talk by how we hear our own voices. When we're listening to loud music on headphones we subconsiously speak louder so that we can hear our voices over the music. Just like when people are at a party or in a club they talk really loud only that in this case the music is being heard by one person.

Answer 3

The headphones block the sound of their own voice so they speak up. We
don't know how loud we are talking unless we can hear it. It is the same
reason that deaf people have difficulty speaking.

Answer 4

because the music is loud and very close to our ears and as a response to the sensation/stimuli our voice wants to react to what the ears are experiencing, another reason could be that because you need people to speak loud to you while you are wearing a microphone, you naturally tend to do the same to them while speaking to them....that is why you end up speaking loud without hearing it