Interesting dive into synaesthesia as a ground for language. To your last point, this holistic ‘we are one’ ecocritical frame in ways extrapolates to the Stoned Ape theory, inasmuch as the difference between our senses is perhaps more normative than it is biological (given we cannot isolate senses).

If absorption of stimuli became muddied in the crossed-wires of our senses, it is not impossible (but perhaps implausible) to imagine new way of Being catalysed by melting the hard borders of our frames with psychedelics.

Even if this breeds little scientific merit, it does create an incredibly interesting grounds for imagination, if nothing else.