Exemplar-based learning requires: (1) a segmentation procedure for identifying the units of past experiences that a present experience can be compared to, and (2) a similarity function for comparing these past experiences to the present experience. This article argues that for a learner to learn a language these two mechanisms will require…

This article reviews two aspects of human learning: (1) people draw inferences that appear to rely on hierarchical conceptual representations; (2) some categories are much easier to learn than others given the same number of exemplars, and some categories remain difficult despite extensive training. Both of these results are difficult to reconcile…

Humans are sensitive to the properties of individual items, and exemplar models are useful for capturing this sensitivity. I am a proponent of an extension of exemplar-based architectures that I briefly describe. However, exemplar models are very shallow architectures in which it is necessary to stipulate a set of primitive elements that make up…

Ambridge argues that the existence of exemplar models for individual phenomena (words, inflection rules, etc.) suggests the feasibility of a unified, exemplars-everywhere model that eschews abstraction. The argument would be strengthened by a description of such a model. However, none is provided. I show that any attempt to do so would immediately…

The radical exemplar model resonates with work on perceptual classification and categorization highlighting the role of exemplars in memory representations. Further development of the model requires acknowledgment of both the fleeting and fragile nature of perceptual representations and the gist-based, good-enough quality of long-term memory…

Kathy Hirsh-Pasek is the Stanley and Debra Lefkowitz Faculty Fellow in the Department of Psychology at Temple University and a Senior Fellow at the Brookings Institution. She is the past president of the International Society for Infant Studies, served as the Associate Editor of "Child Development" and is on the governing counsel of the…

Ambridge argues that there is widespread agreement among child language researchers that learners store linguistic abstractions. In this commentary the authors first argue that this assumption is incorrect; anti-representationalist/exemplar views are pervasive in theories of child language. Next, the authors outline what has been learned from this…

John McDowell begins his essay "Knowledge by Hearsay" (1993) by describing two ways language matters to epistemology. The first is that, by understanding and accepting someone else's utterance, a person can acquire knowledge. This is what philosophers call "knowledge by testimony." The second is that children acquire knowledge in the course of…

Stoel-Gammon (this issue) states that "from birth to age 2 ; 6, the developing phonological system affects lexical acquisition to a greater degree than lexical factors affect phonological development" (this issue). This conclusion is based on a wealth of data; however, the available data are somewhat limited in scope, focusing on rather holistic…

The article by Carota and Sirigu addresses a fundamental issue, namely the domain specificity of people's ability to learn and implement sequential structures of events. The authors review theoretical positions and empirical findings related to this issue, providing a useful summary of representative models of sequential event structures, and a…

The theory that language acquisition is guided and constrained by inborn linguistic knowledge is assessed. Specifically, the "no negative evidence" view, the belief that linguistic theory should be restricted in such a way that the grammars it allows can be learned by children on the basis of positive evidence only, is explored. Child language…

In her book on Wittgenstein's "Philosophical Investigations", Beth Savickey points out that few critics pay explicit attention to Wittgenstein's references to the child and childhood, particularly in his later work. She argues (paraphrasing Wittgenstein) that "the figure of the child is the figure that draws together the concepts of teaching and…

It is proposed that, in contrast to Chomsky's argument, it is possible to arrive at an empirically grounded definition of innate linguistic competence that guides the child in the construction of grammar, particularly when this process is viewed as developmental. This approach treats language acquisition as a process of change. It is suggested…

Claims that the way people symbolize their experiences in speaking, listening, and writing can help them to understand literature and, ultimately, their personal life experiences. Claims that making meaning is fundamental to all language learning and that reading literature is analogous to other language learning experiences. (JD)

Deals with several related problems of language contact, approximative systems, and language learning situations. Proposes the recognition of "fixed approximative languages" in relation to learning situations. (Author)