scholarly journals Khoekhoegowab tone sandhi: New experimental evidence

2021 ◽  
Author(s):  
Leland Paul Kusmer
Keyword(s):  
Experimental Evidence ◽  
The Other ◽  
Tone Sandhi ◽  
Production Experiment ◽  
Embedded Clauses ◽  
Independent Domain

Khoekhoegowab has a tone sandhi process that replaces each underlying tonal melody with an arbitrary secondary melody. This process at first appears to be an unusual example of a "left-dominant" sandhi process in the sense of Yue-Hashimoto (1987) or Zhang (2007). Within a given domain, the leftmost word retains its base from, but the other words undergo paradigmatic substitution; left-dominant systems typically involve spreading of a tonal melody rather than substitution. However, this description of Khoekhoegowab sandhi seems to break down when we consider verbs. Prior descriptions disagree as to whether verb sandhi depends on the placement of a tense-marking clitic (Haacke 1999) or the embedding status of the clause (Brugman 2009). This paper presents the results of a new prosodic production experiment aimed at resolving this conflict. The result is a hybrid generalization: verbs in matrix clauses undergo sandhi when preceded by a tense marker, but verbs in embedded clauses resist sandhi across the board. Thus, Khoekhoegowab continues to look like an exceptional left-dominant system: The verb and tense marking form a sandhi domain in matrix clauses (triggering sandhi on the verb whenever it is not leftmost within that domain), but in embedded clauses verbs form their own independent domain instead.

How “Native” Are Heritage Speakers?

2013 ◽  
Vol 10 (2) ◽  
pp. 153-177 ◽  
Author(s):  
Silvina Montrul
Keyword(s):  
Language Learning ◽  
Experimental Evidence ◽  
Native Speakers ◽  
Learning Experience ◽  
Age Of Acquisition ◽  
The Other ◽  
Gender Agreement ◽  
Heritage Speakers ◽  
High Incidence ◽  
Incomplete Acquisition

One of the chief characteristics of heritage speakers is that they range in proficiency from “overhearers” to “native” speakers. To date, the vast majority of linguistic and psycholinguistic studies have characterized the non-target-like linguistic abilities of heritage speakers as a product of incomplete acquisition and/or attrition due to reduced exposure and opportunities to use the language during childhood. This article focuses on the other side of the problem, emphasizing instead the high incidence of native-like abilities in adult heritage speakers. I illustrate this issue with recent experimental evidence from gender agreement in Spanish, a grammatical feature that is mastered at almost 100% accuracy in production by native speakers;yet it is one of the most difficult areas to master for non-native speakers, including near-natives.I discuss how age of acquisition and language-learning experience explain these effects.

Are mesoionic compounds aromatic?

1998 ◽  
Vol 76 (6) ◽  
pp. 869-872 ◽  
Author(s):  
Alfredo Mayall Simas ◽  
Joseph Miller ◽  
Petrônio Filgueiras de Athayade Filho
Keyword(s):  
Experimental Evidence ◽  
Key Words ◽  
Dipole Moments ◽  
The Other ◽  
Side Chain ◽  
Theoretical Studies ◽  
X Ray Diffraction ◽  
Ring Plane ◽  
X Ray ◽  
Single Bonds

We have evaluated the experimental evidence relevant to the structure and character of mesoionic compounds, accumulated for more than 100 years and including X-ray diffraction studies. We have also evaluated relevant theoretical studies. All these, including our own extensive work, lead us to conclude that mesoionic compounds are not aromatic. According to our recent definition “mesoionic compounds are planar five-membered heterocyclic betaines with at least one side chain whose α-atom is also in the ring plane and with dipole moments of the order of 5 D. Electrons are delocalized over two regions separated by what are essentially single bonds. One region, which includes the a-atom of the side chain is associated with the HOMO and negative π-charge whereas the other is associated with the LUMO and positive π-charge.” Key words: mesoionic compounds, betaines, aromaticity.

Some notes on the relationship of plant viruses with vector and non-vector insects

Parasitology ◽  
1941 ◽  
Vol 33 (1) ◽  
pp. 110-116 ◽  
Author(s):  
Kenneth M. Smith
Keyword(s):  
Sugar Beet ◽  
Experimental Evidence ◽  
Plant Viruses ◽  
Artificial Feeding ◽  
The Body ◽  
The Other ◽  
Insect Vector ◽  
Feeding Methods ◽  
Relationship Of ◽  
The Relationship

Extracts of caterpillars and other insects are shown to inhibit the infective power of tobacco mosaic and tobacco necrosis viruses. The inhibitor is not sedimented after spinning for 2½ hr. at 30,000 r.p.m. Experiments with non-vector insects such as caterpillars have shown that the virus of sugar-beet curly-top, of tobacco ringspot and other viruses, are destroyed within the body of the insect. On the other hand, tobacco mosaic virus passes through the body of the caterpillar unchanged though greatly reduced in concentration. By the use of the specific insect vector and artificial feeding methods it was possible to recover the virus of curly-top 24 hr. after it had been injected into the blood of the caterpillar but the viruses of tobacco mosaic and tobacco necrosis could not be so recovered. Experimental evidence is given to show that the virus of beet curly-top is present in the saliva of viruliferous insects.

On invisibility and experimental evidence

2014 ◽  
Vol 18 (1) ◽  
pp. 25-26 ◽  
Author(s):  
ALBERT COSTA ◽  
MIREIA HERNÁNDEZ ◽  
MARCO CALABRIA
Keyword(s):  
Executive Function ◽  
Experimental Evidence ◽  
Executive Control ◽  
The Other ◽  
Bilingual Group

At the outset of her article Valian (2014) advocates for the existence of an effect of bilingualism on executive control (EC). She is commended for being very clear about her position. She argues that: “There is a benefit of bilingualism for executive function, but that benefit competes with other benefits that both mono- and bilinguals have to varying degrees. Depending on the composition of each group in any given experiment, the other benefits may be more plentiful in the monolingual than bilingual group (or sufficiently plentiful in both groups), so that the benefits of bilingualism are invisible. This is the possibility that I favor.”

Mischkolonien auxotropher und Wildtypzellen nach Behandlung von Esdierichia coli-Zellen mit salpetriger Säure

1963 ◽  
Vol 18 (3) ◽  
pp. 245-252 ◽  
Author(s):  
F. Kaudewitz ◽  
K. Moebus ◽  
H. Kneser
Keyword(s):  
Experimental Evidence ◽  
Nitrous Acid ◽  
Single Cells ◽  
The Other ◽  
Mathematical Treatment ◽  
E Coli ◽  
Type 3 ◽  
Good Agreement ◽  
Hybrid Dna ◽  
In Cells

Cells of E. coli incubated in nitrous acid give rise 1. to unchanged wildtype colonies, 2. to colonies composed of wildtype and auxotrophic cells and 3. to colonies consisting of auxotrophic cells only. The mixed colonies are considered to originate from single cells each of them harbouring hybrid DNA with one subunit, probably a sisterstrand, changed by deamination of a cytosine or adenine, the other one with unchanged wildtype composition. In cells producing type 3 colonies this wildtype strand is mutated lethally by a separate deamination of a cytosine or adenine. A mathematical treatment of this hypothesis leads to predictions which are in good agreement with experimental evidence. The data obtained are used for an estimation of the number of gene-loci of E. coli.

scholarly journals Predation selects for smaller eye size in a vertebrate: effects of environmental conditions and sex

2019 ◽  
Vol 286 (1897) ◽  
pp. 20182625 ◽  
Author(s):  
Richard Svanbäck ◽  
Frank Johansson
Keyword(s):  
Visual Acuity ◽  
Phenotypic Plasticity ◽  
Experimental Evidence ◽  
Predation Risk ◽  
Environmental Conditions ◽  
Retinal Image ◽  
The Other ◽  
Eye Size ◽  
Fish Predators ◽  
Resource Levels

Increased eye size in animals results in a larger retinal image and thus improves visual acuity. Thus, larger eyes should aid both in finding food as well as detecting predators. On the other hand, eyes are usually very conspicuous and several studies have suggested that eye size is associated with predation risk. However, experimental evidence is scant. In this study, we address how predation affects variation in eye size by performing two experiments using Eurasian perch juveniles as prey and either larger perch or pike as predators. First, we used large outdoor tanks to compare selection due to predators on relative eye size in open and artificial vegetated habitats. Second, we studied the effects of both predation risk and resource levels on phenotypic plasticity in relative eye size in indoor aquaria experiments. In the first experiment, we found that habitat altered selection due to predators, since predators selected for smaller eye size in a non-vegetated habitat, but not in a vegetated habitat. In the plasticity experiment, we found that fish predators induced smaller eye size in males, but not in females, while resource levels had no effect on eye size plasticity. Our experiments provide evidence that predation risk could be one of the driving factors behind variation in eye size within species.

Progeny Testing of Dairy Bulls at Different Levels of Management

1954 ◽  
Vol 1954 ◽  
pp. 83-85 ◽  
Author(s):  
I. L. Mason
Keyword(s):  
Dairy Cattle ◽  
Experimental Evidence ◽  
Environmental Conditions ◽  
The Other ◽  
Progeny Testing ◽  
Laboratory Mice ◽  
Dairy Bulls ◽  
The Tropics ◽  
Different Levels ◽  
European Cattle

There are two schools of thought concerning the most appropriate environment in which to select breeding animals. One says ‘ Always select animals under environmental conditions similar to those where they are to be used ‘. The other says ‘ Select breeding animals in the optimum environment so that they have the best chance of revealing their genetic capabilities ‘. Experiments on growth of laboratory mice and experience with European cattle in the tropics have shown the advisability of the first course in these cases. In regard to hill sheep and dairy cattle in Britain, on the other hand, practice favours the second course, but there is little experimental evidence to support it.

scholarly journals THE COEXISTENCE OF PROTOZOAN-LIKE PARASITES AND MENINGOENCEPHALITIS IN MICE

1924 ◽  
Vol 40 (1) ◽  
pp. 51-62 ◽  
Author(s):  
E. V. Cowdry ◽  
F. M. Nicholson
Keyword(s):  
Experimental Evidence ◽  
Small Proportion ◽  
Clinical Symptoms ◽  
The Other ◽  
Laboratory Mice ◽  
Direct Experimental Evidence

A small proportion of laboratory mice, which appear to be normal, are in reality suffering from an obscure disease characterized by the presence of marked meningoencephalitic lesions which are often accompanied by protozoan-like parasites. Both the lesions and the parasites closely resemble others previously reported in rabbits, which likewise fail to reveal themselves by pronounced clinical symptoms. In the absence of direct experimental evidence it is suggested either that one species of parasite is capable of producing the lesions in both animals, or else that we have to do with two kinds of parasites which are closely related and, in the stages thus far observed, are indistinguishable one from the other.

Which Parties Can Lead Opinion? Experimental Evidence on Partisan Cue Taking in Multiparty Democracies

2012 ◽  
Vol 46 (11) ◽  
pp. 1485-1517 ◽  
Author(s):  
Ted Brader ◽  
Joshua A. Tucker ◽  
Dominik Duell
Keyword(s):  
Great Britain ◽  
Political Parties ◽  
Experimental Evidence ◽  
The Other ◽  
Policy Preferences ◽  
Policy Issues ◽  
Ideological Position ◽  
Ideological Clarity ◽  
The Impact ◽  
Opposition Parties

Political parties not only aggregate the policy preferences of their supporters, but also have the ability to shape those preferences. Experimental evidence demonstrates that, when parties stake out positions on policy issues, partisans become more likely to adopt these positions, whether out of blind loyalty or because they infer that party endorsements signal options consistent with their interests or values. It is equally clear, however, that partisans do not always follow their party’s lead. The authors investigate the impact of three party-level traits on partisan cue taking: longevity, incumbency, and ideological clarity. As parties age, voters may become more certain of both the party’s reputation and their own allegiance. Governing parties must take action and respond to events, increasing the likelihood of compromise and failure, and therefore may dilute their reputation and disappoint followers. Incumbency aside, some parties exhibit greater ambiguity in their ideological position than other parties, undermining voter certainty about the meaning of cues. The authors test these hypotheses with experiments conducted in three multiparty democracies (Poland, Hungary, and Great Britain). They find that partisans more strongly follow their party’s lead when that party is older, in the opposition, or has developed a more consistent ideological image. However, the impact of longevity vanishes when the other factors are taken into account. Underscoring the importance of voter (un)certainty, ideologically coherent opposition parties have the greatest capacity to shape the policy views of followers.

Phonotactic c(l)ues to Bantu noun class disambiguation

2016 ◽  
Vol 2 (1) ◽  
Author(s):  
Aaron Braver ◽  
Wm. G. Bennett
Keyword(s):  
South Africa ◽  
Experimental Evidence ◽  
The Other ◽  
Bantu Language ◽  
Noun Classes ◽  
Noun Class ◽  
Present Experimental Evidence

AbstractWhile a number of phonologists assume that phonotactics can provide clues to abstract morphological information, this possibility has largely gone unconsidered in work on Bantu noun classes. We present experimental evidence from isiXhosa (a Bantu language of the Nguni family, from South Africa), showing that speakers make use of root phonotactics when assigning noun classes to nonce words. Nouns in Xhosa bear class-indicating prefixes, but some of these prefixes are homophonous – and therefore ambiguous. Our findings show that when speakers are presented with words that have prefixes ambiguous between two classes, phonotactic factors can condition them to treat the nouns as one class or the other. This suggests that noun class (and other abstract morphological information) is not only stored in the lexicon, but is also redundantly indicated by phonotactic clues.

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