listen. this is a fascinating discussion up to this point... but...this does not in anyway prove that psychedelia began with a couple/handful of pop songs from the later stages of beatlemania. or by any random collection of american and british folk, folk-rock and straightforward rock bands. don't get me wrong, i love those songs, no doubt, especially donovan, but pschedelia didn't begin there, it was part of something bigger, pop rock is what it is. just like the free speech movement didn't really begin at Peoples Park in Berkeley, though it is convenient to thinks so. just like the civil rights movement didn't begin with Martin Luther King and his 'I Have a Dream' speech, but i suppose it can be considered a turning point. if by pschedelia you mean acid rock, then you have alot of explaining to do about how that can only happen in a recording studio. that idea in itself seems a wee bit contrived and shall we a poor synthesis to me.
that's like saying a drum circle is not a drum circle unless you have someone on cowbell and everybody has to wear a green shirt. i hope you can see how contrived/unrealistic that is.
About the origin of pychedelia, we could also name "The Word", because of the colorful lyrics, the repetitive guitar, crazy bass playing, the intrincate drumming and the hypnotic harmonium. But it would be a proto-psychedelic tune. But still the first nearly pure psychedelic songs I can think of are "Eight Miles High" and "Shapes Of Things".
again those might be fine examples of proto-acid rock and acid rock, but that has precisely nothing to do with the the civil rights and free speech movements that were also a prominent part of the the 1960's counterculture. again the framework was much larger, a good example of this, is dino valenti song get together, other bands were able to expand and improve upon his original song and the beautiful lyrics.