Selective hearing? or behaviour?

[Trinaj]

My ds1 - nearly 3 - has had his hearing tested and all appears to be clear.
Despite this he hardly ever responds when spoken to - so much so it's got to the stage where I have to stop him and get his attention to get a proper response. I'm sure he normally hears me, but chooses to ignore as he often screams and shouts at me and dh as soon as we call his name, before we've even asked anthing.
He's very bright and has complete speech - but he has recently started mumbling to himself when talking to someone and won't repeat loud enough to understand.
I'm a little concerned about all this.
I've worked with children for 9 years and am concerned that this is not normal behaviour.

My DD1 3.8 has been doing this for ages. Drives me potty. She listens when I scream at the top of my lungs, but obv that is not good practice. I get a very sore throat

No idea how to change it, I try not to shout, but get attention, speak very clear and slow and in a tone of voice she knows is not amused. I have varying degrees of success, depending on what mood I'm in as to how calm I am, and whether we're in a rush.

I think it's something they have to grow out of, tho by many accounts that might not be til adulthood.

DH still blanks me out and he is 40 so.............

my dd's were pretty much the same, and one still is, is he so wrapped up in what he is doing that he doesnt comprehend?
sometimes i called dd a different name just to get a response?

It doesn't make any difference whether I talk quietly, shout, am right infront of him or in another room! He just doesn't respond, I can be sat right infront of him and he still doesn't answer, or just starts shouting, crying and throwing himself about!
I sometimes wonder if he's just very involved but the screaming at any kind of interruption is starting to worry me!

when was his hearing tested?

same prob with 4 yr old. I find it works best if i get down to his level in front of him and tell him to look at me, he looks away and i just keep reminding him to look at me, i usually have to remind him to look at me about 3 times per sentence but it does work. i am also quite concerned and spoke to hv who has referred me to behaviourial speacialist, i dont feel he is being naughty although at times he can b it just seems his mind is somewhere else most of the time

Hearing was tested a few months ago and he has to go back in dec - just to see if there's any change.
I seem to spend my whole life asking him to look at me so I can get him attention. As you say orangehead - about 20 times per sentence!