In many pop songs I've listened to, when the singer touches the high notes in a line, it is sung like a falsetto.
For example, in this cover of Hello by Conor Maynard, the chorus starts from 1:14. Observe the capitalized part of the lines:
Hello from the other siiiiidEEE''
I must have called a thousand tiimesSSS
To TELL you I'M sorrEYYYY
He increases the pitch at those capitalized words and the voice is like, 'smooth' and high pitched. I do not know how to describe that, but, you could get the idea.
I've heard these in Michael Jackson songs especially the parts where Jackson sings 'HeHe' or 'I'.
I simply called it as falsetto, but I have learnt that one cannot blend falsetto and chest voice, as falsetto requires the vocal chords to be disconnect and chest voice has them connected.
The guy in the video seems to 'blend' them, i.e., sings only the word with the highest note with that voice and the rest seems to be his chest voice.
What is the correct terminology used for this 'impulsive high pitched' singing?