منابع مشابه
Why are Korean tense stops acquired so early?: The role of acoustic properties
Transcription-based studies have shown that tense stops appear before aspirated or lax stops in most Korean-acquiring children's speech. This order of mastery is predicted by the short lag Voice Onset Time (VOT) values of Korean tense stops, as this is the earliest acquired phonation type across languages. However, the tense stop also has greater motor demands than the other two phonation types...
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We present an extension of the ACT-R model by Taatgen and Anderson (2002) of learning the English past tense that can take into account the production of irregularization errors. These errors are produced by using examples of irregular verbs as the basis for analogy. The relative rareness of irregularization errors puts constraints on the rule generalization process The model explains this by t...
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Clicks occur abundantly in the languages of southern Africa, but are not found anywhere else. This is unexpected since the clicks seem to be both auditorily salient and easy to produce. This paper suggests that the reason for the areal skewness of clicks lies in the African phonetictypological environment rather than in production or perception constraints. In particular, clicks are limited to ...
متن کاملWhy so many sperm cells?
A key limiting step in fertility is the search for the oocyte by spermatozoa. Initially, there are tens of millions of sperm cells, but a single one will make it to the oocyte. This may be one of the most severe selection processes designed by evolution, whose role is yet to be understood. Why such a huge redundancy is required and what does that mean for the search process? we discuss here the...
متن کاملWhy are so many trees hollow?
In many living trees, much of the interior of the trunk can be rotten or even hollowed out. Previously, this has been suggested to be adaptive, with microbial or animal consumption of interior wood producing a rain of nutrients to the soil beneath the tree that allows recycling of those nutrients into new growth via the trees roots. Here I propose an alternative (non-exclusive) explanation: suc...
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ژورنال
عنوان ژورنال: Journal of Cell Biology
سال: 2007
ISSN: 1540-8140,0021-9525
DOI: 10.1083/jcb.1764rr4