@cite{potts-etal-2016}: Embedded Implicatures as Pragmatic Inferences #
@cite{potts-etal-2016}
"Embedded Implicatures as Pragmatic Inferences under Compositional Lexical Uncertainty." Journal of Semantics 33(4): 755–802.
The Puzzle #
Scalar implicatures interact asymmetrically with logical operators:
- UE (upward-entailing): "Every player hit some of his shots" → embedded implicature "some but not all" (enriched reading SSS preferred)
- DE (downward-entailing): "No player hit some of his shots" → global reading preferred, no embedded implicature (NNN preferred)
The Model: Compositional Lexical Uncertainty #
The key innovation is lexical uncertainty: L1 marginalizes over possible lexica (refinements of "some") rather than using a fixed literal semantics. Two lexica:
- Weak: "some" = "at least one" (standard lower-bound semantics)
- Strong: "some" = "some but not all" (enriched semantics)
This uses the standard RSAConfig latent variable mechanism: Latent := Lexicon.
No special infrastructure needed — the same mechanism handles observations
(@cite{goodman-stuhlmuller-2013}), scope readings (@cite{scontras-pearl-2021}),
and QUDs (@cite{kao-etal-2014-hyperbole}).
Architecture #
The experiment (Section 6) uses 3 players, each with outcome N (nothing) /
S (scored but not aced) / A (aced). The 10 equivalence classes are the
multisets of 3 outcomes. Utterances are PlayerQ × ShotQ (outer × inner
quantifier): "every/exactly one/no player hit all/none/some of his shots."
Predictions #
The asymmetry arises from monotonicity:
- DE (under "no"): strong "some" widens the true-world set → less informative → L1 prefers weak lexicon → global reading (NNN)
- UE (under "every"): strong "some" narrows the true-world set → more informative → L1 prefers strong lexicon → enriched reading (SSS)
World state as equivalence class over 3 players' outcomes. Each player's outcome: N (nothing), S (scored but not aced), A (aced). 10 classes = multisets of size 3 from {N, S, A}.
- NNN : World
- NNS : World
- NNA : World
- NSS : World
- NSA : World
- NAA : World
- SSS : World
- SSA : World
- SAA : World
- AAA : World
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- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.instBEqUtterance.beq x✝¹ x✝ = false
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Lexicon: how "some" is interpreted.
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Number of players who scored (hit ≥ 1 shot, i.e. S or A).
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- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NNN.numScored = 0
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NNS.numScored = 1
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NNA.numScored = 1
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NSS.numScored = 2
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NSA.numScored = 2
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NAA.numScored = 2
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.SSS.numScored = 3
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.SSA.numScored = 3
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.SAA.numScored = 3
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.AAA.numScored = 3
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Number of players who aced (hit all shots).
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- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NNN.numAced = 0
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NNS.numAced = 0
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NNA.numAced = 1
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NSS.numAced = 0
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NSA.numAced = 1
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NAA.numAced = 2
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.SSS.numAced = 0
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.SSA.numAced = 1
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.SAA.numAced = 2
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.AAA.numAced = 3
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Number of players who scored but did not ace.
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- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NNN.numScoredNotAced = 0
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NNS.numScoredNotAced = 1
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NNA.numScoredNotAced = 0
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NSS.numScoredNotAced = 2
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NSA.numScoredNotAced = 1
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NAA.numScoredNotAced = 0
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.SSS.numScoredNotAced = 3
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.SSA.numScoredNotAced = 2
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.SAA.numScoredNotAced = 1
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.AAA.numScoredNotAced = 0
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Number of players who did nothing (hit 0 shots).
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- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NNN.numNothing = 3
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NNS.numNothing = 2
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NNA.numNothing = 2
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NSS.numNothing = 1
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NSA.numNothing = 1
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.NAA.numNothing = 1
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.SSS.numNothing = 0
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.SSA.numNothing = 0
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.SAA.numNothing = 0
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.World.AAA.numNothing = 0
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Count of players satisfying the inner predicate, under a given lexicon.
all: number who acednone_: number who did nothingsome_: depends on lexicon:- weak: number who scored (≥ 1 shot)
- strong: number who scored but did not ace
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- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.predCount Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.ShotQ.all lex w = w.numAced
- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.predCount Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.ShotQ.none_ lex w = w.numNothing
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Truth value of an utterance in a world under a lexicon.
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- Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.utteranceTruth lex Phenomena.ScalarImplicatures.Studies.PottsEtAl2016.Utterance.null x✝ = true
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@cite{potts-etal-2016} lexical uncertainty model.
Latent variable = Lexicon (weak vs strong "some"). L0: literal listener under lexicon l. S1: belief-based scoring, rpow(L0(w|u), α). L1: marginalizes over lexica with uniform prior.
Uniform priors, α = 1, no utterance cost. Qualitative predictions (DE blocking, UE enrichment) hold across a range of rationality parameters.
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Lexica agree on all non-"some" utterances. The lexicon only affects the interpretation of "some"; "all" and "none" are unambiguous.
DE context: strong "some" widens the set of true worlds relative to weak. Under "no player hit some of his shots":
- Weak "some": only NNN satisfies (1 world)
- Strong "some": NNN, NNA, NAA, AAA satisfy (4 worlds) Widening makes the utterance less informative under the strong lexicon.
UE context: strong "some" narrows the set of true worlds relative to weak. Under "every player hit some of his shots":
- Weak "some": SSS, SSA, SAA, AAA satisfy (4 worlds)
- Strong "some": only SSS satisfies (1 world) Narrowing makes the utterance more informative under the strong lexicon.
"No player hit some of his shots" → NNN preferred.
Under the weak lexicon, only NNN makes the utterance true (1 world, maximally informative). Under the strong lexicon, NNN, NNA, NAA, and AAA all make it true (4 worlds, less informative). L1 marginalizes over lexica weighted by informativity, preferring the weak lexicon for this utterance. Result: NNN receives the highest posterior — the global reading.
DE blocking: NNN > NNA.
DE blocking: NNN > NAA.
DE blocking: NNN > AAA.
"Every player hit some of his shots" → SSS preferred.
Under the strong lexicon, only SSS makes the utterance true (1 world, maximally informative). Under the weak lexicon, SSS, SSA, SAA, and AAA all make it true (4 worlds, less informative). L1 marginalizes and prefers the informative strong lexicon for this utterance. Result: SSS receives the highest posterior — the embedded implicature.
UE enrichment: SSS > SSA.
UE enrichment: SSS > SAA.
UE enrichment: SSS > AAA.
The 6 qualitative findings from the @cite{potts-etal-2016} LU model. 3 DE blocking predictions (global reading preferred under "no") + 3 UE enrichment predictions (enriched reading preferred under "every").
- de_NNN_vs_NNA : Finding
- de_NNN_vs_NAA : Finding
- de_NNN_vs_AAA : Finding
- ue_SSS_vs_SSA : Finding
- ue_SSS_vs_SAA : Finding
- ue_SSS_vs_AAA : Finding
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All findings.
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Map each empirical finding to the RSA model prediction that accounts for it.
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The RSA model accounts for all 6 qualitative findings from @cite{potts-etal-2016}.
The outer quantifiers "every" and "no" in the @cite{potts-etal-2016} model
agree with the generic quantity domain semantics from RSA.Domains.Quantity.meaning.
This grounds the stipulated utteranceTruth in the shared quantifier infrastructure.
See also: GoodmanStuhlmuller2013.quantifier_meaning_grounded.
"Every player hit X" ↔ Quantity.meaning 3 .all applied to predCount.
"No player hit X" ↔ Quantity.meaning 3 .none_ applied to predCount.
The @cite{potts-etal-2016} predictions connect to two other parts of linglib:
someAllBlocking(ScalarImplicatures.Basic): The empirical datum that "some" implicatures are present in UE and blocked in DE. The Potts model derives both sides: UE enrichment (§7) and DE blocking (§6).Geurts2010(ScalarImplicatures.Studies.Geurts2010): Notes that the minimal LU model inverts the predictions, but "the full Potts et al. model derives the correct pattern." The theorems here are the formal backing.EmbeddedSIPrediction(LexicalUncertainty.Compositional): Tracks embedded SI predictions by context type. The Potts model demonstrates the negation case: local reading dispreferred in DE (global NNN preferred).
The Potts model matches the someAllBlocking empirical pattern:
UE enrichment present (implicatureInUE = true) and
DE blocking present (implicatureInDE = false).