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Okay, so a little background information:

Recently I've been thinking about how quite a few languages (talking mostly about IE languages here) appear to be 'simplifying' themselves over time, getting rid of cases and simplifying their conjugation systems. Obviously, these languages aren't truly 'simplifying' themselves. There is no doubt that Latin's case system, for example, is obviously more complex than, say, English's, but does that make English's grammar less complex? Where older IE languages like Latin and old English used inflection to convey meaning, modern languages like English and Italian use syntax and other means of doing so. These languages aren't 'simplifying' themselves, just becoming less synthetic and more analytical, it's not about complexity here.

But the trend is still undoubtedly there, modern IE languages are -as a general pattern- becoming more analytical, like how Italian has no cases, Latin had five, Proto-Italic is reconstructed to have seven, PIE probably had eight, and if PIE had a predecessor, perhaps something like Proto-Nostratic, a theory which might be on to something, but it would definitely be difficult to reconstruct such an old proto language beyond a handful of roots and some very basic grammar, that predecessor would have been even more synthetic, possibly something even like Turkish or Finnish. So, here are my questions:

a) If the farther back we go, the more morphologically complex these languages get, then how would have such a complex languages arisen in the first place? How did early humans go from a few strings of sounds to denote objects or even actions, to eventually be speaking in an elaborately inflected language so easily? I know this evolution would have taken place over literally millions of years, and that we will probably never know for certain, but if there is some thought up explanation I would like to hear it.

b) Why is it that so many languages are becoming less synthetic over time? Is it because of some change in people themselves? Or are more analytical languages just 'lazier'? It doesn't make sense that they just would. There has to be some reason I have failed to think of. It doesn't make sense that synthetic languages are simply less efficient, because then why would they appear in the first place? Has there been any research on this that I am unaware of? Then I would definitely like to see it.

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    There is a theory that describes this as a cyclical development, though it’s not widely accepted (but also not actually disproved – mostly people object to the notion that it’s cyclical, since only individual steps in the cycle are known for certain to have happened. This is known as the typological-cycle. May 23, 2021 at 21:04
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    @JanusBahsJacquet I've seen it argued that Egyptian/Coptic went through a full cycle, with e.g. subject marking on verbs going from (enclitic) suffixes, to independent syntactic words, to incorporated prefixes. I like the idea that it's cyclical, but of course we don't have many languages attested across that time depth to examine.
    – Draconis
    May 23, 2021 at 21:12
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    it being cyclic certainly seems an oversimplification, because many languages have gone backwards (at least a little). Take the early Romance verb system. They lost a lot of Latin inflection, and started using analytic constructions but then some of those analytic constructions (e.g. the future and conditional) became grammaticalised in a way that isn't meaningfully agglutinative, but is synthetic
    – Tristan
    May 24, 2021 at 9:24
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    It has been proposed that small scale societies (ie where everyone knows everyone else) seem to develop the most complex (relatively speaking) grammars, while the languages of large scale societies become relatively simpler. Here 'complex' refers to greater complexity in the inflectional morphology, and 'simpler' refers to greater reliance on lexical/syntactic strategies. The IE languages you mention happen to be in large scale societies, (there are plenty of IE languages with small scale societies). May 24, 2021 at 12:28
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    @GastonÜmlaut and yet Sinitic languages are increasingly grammaticalising their old syntactic strategies, and some papers have argued that colloquial French has become polysynthetic, in both cases the changes are relatively recent, with the society being much larger than it was earlier. Likewise, Hawai'an & Hmong are pretty analytic languages despite being spoken in small scale societies. It's a neat hypothesis, that on the surface seems plausible but seems very hard to justify on further examination
    – Tristan
    May 24, 2021 at 12:55

3 Answers 3

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(a) If there were a clear trend from flexive type to analytical type, over the last 100,000 years or so, it would follow that almost all the languages of the world would have evolved to be analytic languages (which does not seem to be the case). Therefore, it is possible that there are processes that remorphologize languages. I am not saying that there is a cyclical process, as I know a researcher who found that there are some irreversible trends, which have been growing as the world population went from 10 million (late Paleolithic) to almost 8 billion today. So I consider that in the matter of the existence of morphological flexion there are fluctuations whereby it sometimes decreases and sometimes increases.

(b) This is not clear, but the changes in the Neolithic settlements caused people who spoke different languages to concentrate in larger political organizations, in fact, the work I mention by my colleague showed that it was near the areas where agriculture emerged that there were greater tendencies towards a specific type. However, it is not clear what the specific mechanism would be, by which languages change in the presence of speakers of different languages.

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    Can you name the researcher you know? This would add a lot of value to your answer since it can than be cross-checked and that researcher can be cited for the work. Jun 13, 2022 at 9:05
  • @jk-ReinstateMonica sure, of course, although the work I am referring to is a doctoral thesis that was not even written in English, so I didn't think it would be of interest either, since the work is not easily accessible for that reason.
    – Davius
    Jun 13, 2022 at 14:57
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    @Davius: but without a citation, or even a name, your answer is just a "friend of a friend" anecdote, and we cannot know how reliable anythign in it is.
    – Colin Fine
    Jun 15, 2022 at 22:17
  • @ColinFine I do not agree at all. An anecdote is not the same as a doctoral thesis with organized data (even if scientifically it is preliminary).. I mentioned a possibility and argued for it (I have included the link, FYI, but I don't think that equally makes it indisputable, perhaps I should have cited other papers along the same lines that are published in a suitable journal).
    – Davius
    Jun 16, 2022 at 12:08
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    @Davius: thank you for including the link. That makes all the difference, because now we can look at it and make our own evaluation of its worth. Without a link we were unable to do that.
    – Colin Fine
    Jun 16, 2022 at 13:49
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I will preface this by saying all views here are my own, and are not necessarily the standard view in historical linguistics, which regards PIE, Proto-Uralic etc. as having emerged ex nihilo as far as we are or can be aware. I disagree with this view, I think that Allen Bomhard's recent work has provided enough shared morphology and lexical cognates with regular sound laws to establish his Nostratic superfamily, minus Korean and Japanese. With that caveat out of the way, let me explain how I think a synthetic/fusional language like PIE emerged from Proto-Nostratic.

First. A clarification on Bomhard's tree: according to Bomhard, first there was Proto-Nostratic, from which Proto-Afro-Asiatic branched off first, then Proto-Zagrosian (aka Proto-Elamo-Dravidian), then Proto-Kartvelian and Proto-Eurasiatic. I think that descended from Proto-Eurasiatic are Proto-Indo-European, Proto-Uralo-Siberian (see Fortescue and Vajda 2022, "Mid-Holocene Language Relations between Asia and North America"-- PUS is the ancestor of Proto-Uralo-Yukaghir and Proto-Inuit-Yupik-Unangan), Proto-Nivkh-Chukotko-Kamchatkan (also a Fortescue-suggested macrofamily), and Proto-Micro-Altaic (ancestor of Proto-Turkic, Proto-Serbi, and Proto-Tungusic), and Proto-Tyrsenian (ancestor of Etruscan, Rhaetic, and Lemnian).

And now, with this perspective in mind, here is my answer to the question. Janus Bahs Jacquet mentioned a typological cycle, and I think that a close reading of Bomhard suggests that, atleast with respect to the particles that became case suffixes and verb endings in Finnish, the Proto-Nostratic ancestors of those case suffixes and verb endings were standalone words, according to Bomhard, and that Proto-Nostratic was a fairly analytic language, and English has actually gone through a full cycle from analytic Proto-Nostraric to agglutinative Proto-Eurasiatic to fusional/synthetic PIE and once English finally loses the -s, -ren, goose/geese plurals and -d past English will become analytic again. To illustrate this development more precisely:

The Proto-Nostratic postpositions *nV genitive, *kV allative, *tV locative, (and more) were just postpositions.

Only the intermediate stage between Proto-Nostratic and Proto-Afro-Asiatic allowed the postpositions to sometimes go before the word they modify, becoming prepositions, which turned into prefixes in PAA. PAA also did have suffixes though, from the older postpositions. This is how we know that in Proto-Nostratic *nV, *kV, *tV etc. had to be free-standing to an extent.

In Proto-Zagrosian (PZ), there is a *-n- genitive (found in the Elamite [X]-inni "made of [X]" as well as in the Proto-Dravidian *-n- oblique augment), as well as a *-k(k)V allative (if I am not mistaken from here are the Brahui -kki allative, Elamite -ka/-ki allative) and a locative in *-t(t)V. All of this comes from synthesizing various things I'd read in papers by David McAlpin.

Proto-Dravidian (PDr) has a very interesting reflex of the PZ *-k(k)V allative, found in a PDr *-nk(k)V dative -- I interpret this as an instance of "case-stacking", where a new dative suffix is formed by gluing the genitive to the allative to produce a new suffix of identical or similar meaning. This is a phenomenon attested in Hyderabad (India) dialects of Hindi-Urdu. While standard Hindi-Urdu has mujh ko (the accusative/dative for the 1st singular pronoun, formed from oblique mujh + postposition ko), in Hyderabad, we say mereku instead (genitive mere + ku, for ku cf. ko). This is because in Hindustani, the genitive functions also as a case with which you can use postpositions, cf. Standard Hindustani mere sāmne "in front of me", mere liye "for (the sake of) me", etc.

I said the word "glue". We know where this is leading. Yes, Proto-Zagrosian and Proto-Dravidian clearly took those old Proto-Nostratic postpositions and turned them into stackable case suffixes, in typical fashion for an agglutinative language. So here is an example of going from analytic (PN) to agglutinative (PZ, PDr).

Proto-Eurasiatic apparently did the same thing, because Proto-Uralo-Siberian is extremely stereotypically agglutinative. Fortescue (2022) provides many examples of stacking case suffixes and demonstrative stems, e.g.

PUS *-n genitive singular PUS *-(V)t nominative/absolutive plural PUS *-n(V)t genitive plural = *-n-(V)t

Many Uralo-Siberian languages also stacked the demonstrative stem (PUS *na/nä) onto pronoun stems, e.g. PUS *ki(nä) "who" and the *-n in the PUS personal pronouns 1sg *mV(n), 2sg *tVn and (identical!) subject verbal suffixes 1sg *-mV(n), 2sg *-tV(n).

Proto-Eurasiatic likely did this kind of case-stacking, or started on the way towards it.

This kind of agglutinative behavior stuck around in Finnish and Inuktitut, but it did not stick around in PIE, another Eurasiatic language which took a very different route.

The *nV genitive is survived in the only PIE hysterokinetic noun stems, which take *-r/l for the nom./acc./voc. and *-n- for the oblique cases. The way this happened is that a formerly agglutinative language simplified clusters of stacked case suffixes until they became fusional morphs. For instance, the *-n- genitive became frozen in the oblique forms of nouns like *wód-r̥ nom./acc., *ud-n-é-s gen. and a new suffix *-(e)s with possessive meaning was reanalyzed as the genitive. So here we see agglutinative (PEur) to synthetic (PIE).

And the final step- synthetic back to analytic again, is something we all know about. It is what English is in the process of doing. We gutted all the old PIE oblique cases, now in Modern English we only have "water", inherited from the nom./acc. form *wód-r̥. To express a genitive meaning in Modern English we use a preposition "of", i.e. "of water". We still have a few case suffixes and ablaut grammar left in English- note the plurals water/waters, goose/geese, child/children. Once English loses that, and sounds more like:

"Today I will go to the store and I will buy three apple because I have three sister and they done each ask me for one apple"

English will have completed one full typological cycle, and it will only have taken 15,000 years (Bomhard's date for PN). Arguably some dialects of English already do this, and as those dialects replace Standard American and Standard British English (I am hopeful they will) English will finally be coming one full revolution of the typological cycle.

My direct answer to your question "how could such a morphologically complex language as PIE emerge--and from what?" is effectively the typological cycle hypothesis, which says languages cycle from analytic->agglutinative->synthetic->analytic. This cycle of course only describes changes in certain morphological elements in Nostratic languages, and is not meant to be taken as "the thing all languages must do all the time". I have merely provided an example throughout language families where this happens, and what kinds of changes can cause a language to change typology. There could very well be other possible changes too, as some other commenters have alluded to.

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  • Can you give some examples from Bomhard about the roots that you consider the most reliable for Proto-Nostratic or common between Proto-Eurasiatic and Proto-Kartvellian and Dravidian? I have looked it up and it did not impress me as convincing at all (see my post about his reconstrucion for the word for tongue).
    – Anixx
    Aug 27, 2023 at 14:43
  • My current hypothesis of beyond-Eurasiatic reconstruction does not include Kartvellian and Dravidian at all. I also reliably do not include Japanese but regarding Korean I am not sure.
    – Anixx
    Aug 27, 2023 at 14:45
  • Using the numbering for the cognate sets given in Bomhard (2011). I've barely reviewed the lexical items, but so far these ones have atleast three (fairly) historically strong reflexes in high-level proto-langs of Nostratic branches. *kil- 'to speak' [383] *kʼʷatʼ- ‘to cut’ [474] *qʷ’al- 'to kill, strike' [507] *t͡ɬakʷ- 'to prick, pierce, stab' [515] *wet’- 'be wet; water' [723] *mal- 'suckle' [753] (the PIE *h₂- in *h₂mel- 'to milk' though poses problems-- we still have PAA *mal- 'squeeze, suckle' and PUS *mälV(ɣ) 'breast') PAA=Proto-Afroasiatic, PUS=Proto-Uralo-Siberian
    – abhishek
    Aug 27, 2023 at 21:48
  • *kil - well, I reconstruct "mouth" as tkel, tongue as "tkeln". Fits with me. *wet - can be (plus Mapuche witru- "stream", utru- "to pour liquid"), but I suspect, initial w- is not stable. I suspect he derived these mainly in Eurasiatic data? As to *kʼʷat', *qʷ’al, these easily could be onomatopoeias. Do you believe, these roots are the most reliable in Bomhard?
    – Anixx
    Aug 27, 2023 at 22:31
  • *wet’- (with glottalic *t' to account for *-d- in PIE) > Proto-Peninsular-Dravidian *ot-/ōt- (DEDR 1047), cf. Tamil ōtam 'moisture', Kannada odde 'wetness', Naiki vad, vod 'dew', and possibly also DEDR 743: non-Telugu South II Dravidian languages have *ūt- 'to become wet'. *wet'- > *wot'- > *ot'- is a very plausible phonetic development mirroring exactly what happened with many Dravidian stems in *pe- that became po- sporadically in daughter languages, rounding of the vowel caused by the labial consonant. *ot'- later becomes *ot- with long form *ōt- (length alternates regularly in Drav stems)
    – abhishek
    Aug 28, 2023 at 19:54
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First of all, the immediate predecessor of PIE was probably Proto-Indo-Uralic, then something like Proto-Eurasiatic, while Proto-Nostratic is more hypothetical than not.

So, we can look at Uralic languages in an attempt to grasp what do they have in common with PIE that could be an inherited trait.

And what we see? The most of Uralic languages are agglutinative.

Indeed, it is usually assumed that language development is cyclic: analytic->agglutinative->fusional-> analytic.

What does it mean? In an analytic language like English or Chinese, the meanings of the words are conducted with service words, like modal verbs, articles, proverbs and prepositions. In the second stage of development, those service words are attached to the roots and stems so to become morphemes. In the third stage, those morphemes fuse together so that a morpheme conducts not only one meaning like case or number, but the both, case and number at the same time (for instance). And then the cycle repeats, the complicated morphemes get dropped, and this process is accelerated especially with creolization, when non-native speakers start to speak the language.

Even in PIE we see that the most morphemes, like suffixes or prefixes at that stage still had structure, similar to the roots. They had usually one vowel in various ablaut grades, like suffixes -ter-/-tor-/-tr-, -iea̯-/-ia̯- or -is-/-ios-/-ies-. The endings also had ablaut grades.

Moreover, the prefixes in PIE were mostly adverb-prepositions in shortened ablaut grade. semism-, a̯entia̯nt-, peripro-, a̯epia̯po-, e̯enie̯n-, e̯neue̯nu-, etc.

More to this, PIE was great at concatenation of the roots into one word, and it is often impossible to tell if the word is just a two-root word or a root with some suffix/prefix. Is dusdius ("bad-sky", thunder) a prefix+root or two roots? What about sma̯eḱsia̯ ("one-axis", carriot)? What about ḱleupa̯ter ("famous-father")?

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  • Why are the downvotes?
    – Anixx
    Jun 19, 2022 at 17:00
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    Indeed, long after posting this question, such an explanation makes a lot of sense, and I have even begun to see this development in modern languages, like hindustani, for example. While the language is generally considered to be fairly analytic, with tense and aspect in verbs being marked with modal verbs following the main verb, these verbs are currently merging with the actual verb in the spoken language, basically becoming inflected endings. Even in nouns, postpositions mean that things like case markers merge onto the end of the noun, similarly becoming inflected endings. Jun 21, 2022 at 14:43
  • Also, about your comment on Proto-Nostratic, are you dismissing the specific idea of Proto-Nostratic itself or the general idea of all (or most at least) natural languages having a common ancestor? Because while my second I do strongly believe that they did, I also believe this supposed period of unity was too long ago to be traced or for the language to be reconstructed to any degree. Jun 21, 2022 at 14:47
  • @QuintusCaesius-RM I am skeptical about specifically proto-Nostratic, even though Proto-Afro-Asiatic definitely had common features with PIE, such as one-vowel root. The farthest reasonably definable common node for PIE ancestry in my opinion are the "mitian" languages, the languages which have in common singular first-person pronouns starting with m- (as in English "me") and singular second-person pronouns starting with t- (as in English "thou"). This is the most ancient reliably recognizable feature of PIE ancestry.
    – Anixx
    Jun 21, 2022 at 14:53
  • @QuintusCaesius-RM this is not to say PIE and PAA did not common root but my skepticism is related to the current reconstruction efforts.
    – Anixx
    Jun 21, 2022 at 14:55

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