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The ratio peak at Stimulus 8 for the 60-mel intervals is reliable (i.e., fixed and roving discriminations are significantly different) and indicates the existence of a perceptual anchor effect at that location. - "Perceptual magnet and phoneme boundary effects in speech perception: Do they arise from a … THE PERCEPTUAL-MAGNET EFFECT: AN EMERGENT CONSEQUENCE OF EXEMPLAR-BASED PHONETIC MEMORY Francisco Lacerda Institute of Linguistics, Stockholm University, S-106 91 Stockholm, Sweden ABSTRACT This paper uses a mathematical model of infant speech perception to examine the assumptions and consequences of Kuhl's Native Language Magnet theory (NLM). A class of selective attention models often applied to speech perception is used to study effects of training on the perception of an unfamiliar phonetic contrast. Attention-to-dimension (A2D) models of perceptual learning assume that the dimensions that structure listeners ’ perceptual space are constant and that learning involves only the These representations, stored in the brain, constitute the beginnings of language-specific speech perception and serve as a blueprint which guides infants' attempts to produce speech. The native language magnet effect works to partition the infant's perceptual space in a way that conforms to phonetic categories in the language that is heard. The present study investigated the existence of a ‘‘perceptual magnet’’ effect [Kuhl, Percept. Psychophys.

Abstract. The perceptual magnet effect describes an increased generalization capability for the perception of vowels, if the perceived vowels are prototypical. We here propose an unsupervised, adaptive neural network model which allows to control the relation between stimulus density and generalization capability, and which can account for the perceptual magnet effect. This is the essence of ‘perceptual magnet theory’ (=-=Kuhl and Iverson 1995-=-) in which the phonetic prototypes of one’s native language act like magnets, or, in neural network terms, attractors (Van Geert 1993, 1994), distorting the perception of items in their vicinity to ma Mapping the perceptual magnet effect for speech using signal detection theory and multidimensional scaling February 1995 The Journal of the Acoustical Society of America 97(1):553-62 Consonantal categori-cal perception directly occurs during babbling while the vocalic perceptual magnet effect occurs later on during language specific imitation training. The question of whether sensitivity peaks at vowel boundaries (i.e., phoneme boundary effects) and sensitivity minima near excellent category exemplars (i.e., perceptual magnet effects) stem from claimed shrinking of perceptual space around prototypes has been termed the perceptual magnet effect (see Kuhl, 1991). This effect, if reliable, has important implications for how we categorize speech information. The perceptual magnet effect suggests that category centers are the basis for speech representation.

The results demonstrated that sensitivity peaks at vowel boundaries were more influenced by stimulus range than were perceptual magnet effects; peaks in sensitivity near the /i/-/e/ boundary were reduced with restricted stimulus ranges and one-step intervals, but nüfüma in discrimination near the best exemplars of /i/ were present in all conditions.

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The term perceptual magnet effect refers to the perceptual phenomenon of sensitivity minima near best exemplars, and the exact cause of the perceptual mag-net effect is unknown. Empirical Distinctions Research on the perceptual magnet effect has primar-ily been concerned with establishing the correlation be- The question of whether sensitivity peaks at vowel boundaries (i.e., phoneme boundary effects) and sensitivity minima near excellent category exemplars (i.e., perceptual magnet effects) stem from the same stage of perceptual processing was examined in two experiments. As with the phoneme boundary effect, the perceptual magnet effect has been strongly linked to a hypothesized mechanism; the perceptual magneteffecthas been seen to imply that pho neme categories Iverson, P., Kuhl, P.K. Perceptual magnet and phoneme boundary effects in speech perception: Do they arise from a common mechanism?.

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Effects of vocal loading on the phonation and collision threshold pressures.

Perceptual magnet effect in speech perception

Mapping the perceptual magnet effect for speech using signal detection theory and multidimensional scaling February 1995 The Journal of the Acoustical Society of America 97(1):553-62 CiteSeerX - Scientific documents that cite the following paper: Perceptual magnet and phoneme boundary effects in speech perception: do they arise from a common mechanism?
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Iverson and P. Kuhl}, journal={Perception & Psychophysics}, year={2000}, volume Magnet Effect and Neural Mans ABSTRACT The perceptual magnet effect is one of the earliest known language-specific phenomena arising in infant speech development.

av S Mishra · Citerat av 6 — negative effect of noise on memory of speech for persons with age-related hearing loss.
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In these studies, AX-discrimination tasks purportedly reveal that discriminability of speech sounds from a single category varies with judged phonetic ‘‘goodness’’ of the sounds. However, one possible confound is that category membership is 2006-06-01 Keywords: perceptual magnet effect; categorical perception; Bayesian modeling; computational linguistics Phonetic categories inﬂuence perception of speech sounds, with stimuli belonging to different categories being easier to discriminate than stimuli from a single category (Liberman, Harris, Hoffman, & Grifﬁth, 1957; Kuhl, 1991). However, Taken together, the results of the present series of experiments call into question the use of the perceptual magnet effect as evidence for the role of phonetic prototypes in speech perception. A more precise definition of a phonetic prototype will be necessary before it will be a useful theoretical construct in the field of speech perception and spoken language processing.

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Keywords: perceptual magnet effect; speech perception It has long been known that categories inﬂuence percep-tion, especially in the domain of speech sounds (Liberman, Harris, Hoffman, & Grifﬁth, 1957). Similar categorical ef-fects have been described in other domains, including color perception (Davidoff, Davies, & Roberson, 1999) and ar- THE PERCEPTUAL-MAGNET EFFECT: AN EMERGENT CONSEQUENCE OF EXEMPLAR-BASED PHONETIC MEMORY Francisco Lacerda Institute of Linguistics, Stockholm University, S-106 91 Stockholm, Sweden ABSTRACT This paper uses a mathematical model of infant speech perception to examine the assumptions and consequences of Kuhl's Native Language Magnet theory (NLM).