Foregrounding, as I understand it, is prominence that is motivated - Michael Halliday

p. xiv cited in: Piet Van de Craen (2007) Van Brussel gesproken. p. 118.

In the relative orientation of different social groups towards the various functions of language in given contexts and towards the different areas of meaning that may be explored within a given function

Any text in spoken English is organized into what may be called 'information units'. (...) this is not determined (...) by constituent structure. Rather could it be said that the distribution of information specifies a distinct structure on a different plan. (...) Information structure is realized phonologically by 'tonality', the distribution of the text into tone groups.