Sense of Touch

I noticed something that I have never noticed before. I am hoping it is normal! I had my hair done at with my usual hairdresser and while my head was in the sink and she was warming the water she points the nozzle to my hair and asks if the water is too hot or fine. Funny! I could feel it, but couldn't tell if it was cold you really hot for a good couple of seconds! I have had two serious closed head injuries, but never noticed this sensation and not be able to recognize it as cold or hot immediately!