THE ROLE OF RESPONSE DELAY IN IMPROVING THE DISCRIMINATION PERFORMANCE OF AUTISTIC CHILDREN

This study investigated the influence of a response delay requirement on the discrimination performance of autistic children. In the context of a multiple baseline design with subsequent repeated reversals, two conditions were compared: a no-response-delay condition, where the child was allowed to make the target response immediately after presentation of the discriminative stimulus versus a response-delay condition, where the target response was permitted three seconds following the discriminative stimulus when the therapist would signal the child to respond. The results showed that the response-delay condition produced higher levels of correct responding than the no-response-delay condition. In addition, teachers in the research setting rated the response-delay procedure to be a practical and effective teaching technique that could be implemented in a classroom setting. The results were discussed in relation to the literature on impulsivity, and were interpreted as indicating that the response-delay procedure provides a valuable technique for teaching autistic children.     

Evidence from auditory simple reaction times for both change and level detectors

We examine the form of distributions of simple reaction time. The stimuli we use are the offset of weak pure tones masked by wide-band noise. The hazard functions of the RT distributions (i.e, the probability of a response given that one has not already occurred) are monotone increasing for very weak tones but become peaked for stronger tones. Of the models available in the literature, none is very satisfactory, although two can account for the general qualitative shape of the peaked hazard functions. We propose a model wherein both a change and a level detector function in parallel. If one assumes that the change detector and level detector have slightly different thresholds, this model can account for both the monotone increasing and the peaked hazard functions.     

Case descriptions of nonfluency and loci Initial and follow-up conversations with three preschool children

It has been hypothesized that fluency development may be influenced by linguistic uncertainty, slow speech milestones, and language delay. The purpose of this study was to describe the nonfluent speech characteristics of a stuttering child, a language-impaired child, and a nonstuttering child. Initial assessment results revealed that the stutterer produced more stuttering, the language-impaired child emitted more normal disfluency, and the nonstutterer had only a few normal disfluencies. Six months after therapy, the stutterer had decreased stuttering behavior but increased in normal disfluency. Six months after the initial evaluation and without fluency intervention, the language-impaired child showed an overall decrease in nonfluent behaviors, especially in part-word, whole-word, and phrase repetitions. Both the stutterer and the language-impaired children revised. Minimal nonfluency was observed in the nonstutterer during the initial and postobservation periods. All children produced more nonfluencies on conjunctions and pronouns. Implications for language therapy will be presented.     

A web-based interface to calculate phonotactic probability for words and nonwords in English.

Phonotactic probability refers to the frequency with which phonological segments and sequences of phonological segments occur in words in a given language. We describe one method of estimating phonotactic probabilities based on words in American English. These estimates of phonotactic probability have been used in a number of previous studies and are now being made available to other researchers via a Web-based interface. Instructions for using the interface, as well as details regarding how the measures were derived, are provided in the present article. The Phonotactic Probability Calculator can be accessed at http://www.people.ku.edu/-mvitevit/PhonoProbHome.html.     

To paint the invisible

In this essay, which is preceded by an interview with the translator, the author revisits her earlier critique of Merleau-Ponty’s privileging of the visible, but also takes further her own thinking by drawing specifically on the issues raised within the context of painting. The focal point of her discussion is Merleau-Ponty’s essay, “Eye and Mind.” This paper was first published in Italian as “Dipingere l’invisible,” Segni e Comprensione 44 (December 2001): 10–16. This English translation is from the French version.     

Declarative Memory

ABSTRACT— Neuroimaging of declarative memory is not an endeavor divorced from psychology but, instead, is another path through which a more complete understanding of memory has emerged. Specifically, neuroimaging allows us to determine if differences between memory states emerge from quantitatively or qualitatively distinct underlying encoding operations. Further, it has allowed for greater specification of the putative control operations adopted when we make decisions about our memories. We describe some examples of insights provided by neuroimaging into the many and varied processes that support encoding and retrieval of declarative memory.     

Appraising the Appraisal‐Tendency Framework

This article considers the consumer research implications of the Appraisal‐Tendency Framework (ATF; Han, Lerner, & Keltner, 2007). This article outlines how the ATF approach could be applied to sequential consumer choices (e.g., effects of emotional responses to stockouts on later decisions) and high‐stakes decisions (e.g., medical decisions). This article also proposes several areas in which the ATF might be extended: examining complex sequences of choices with emotional consequences, considering how incidental and integral emotions interact, characterizing how both evaluative and regulatory mechanisms may influence the effects of emotion on judgment and choice, and extending the range of positive emotions and appraisal dimensions considered.     

Why stereotypes don't even make good defaults

Many concepts have stereotypes. This leaves open the question of whether concepts are stereotypes. It has been argued elsewhere that theories that identify concepts with their stereotypes or with stereotypical properties of their instances (e.g., Rosch, E. (1978). Principles of categorization. In E. Rosch & B. B. Lloyd (Ed.), Cognition and Categorization. Hillsdale, NJ: Lawrence Erlbaum Associates; Smith, E. E., Medin, D. L. (1981). Categories and Concepts. Cambridge, MA: Harvard University Press.) fail to provide an adequate account of the compositionality of concepts (Fodor, J., Lepore, E. (1996). The red herring and the pet fish: Why concepts still cannot be prototypes. Cognition, 58, 253-270.; Fodor, J. (1998). Concepts: Where cognitive science went wrong. New York, NY: Oxford University Press.). This paper extends this argument and reports an experiment suggesting that participants do not assume, even as a default strategy, that complex concepts inherit the stereotypes of their constituents. Thus propositions such as "Baby ducks have webbed feet" were judged to be less likely to be true than propositions like "Ducks have webbed feet." Moreover, manipulation of the type and number of noun phrase modifiers revealed a systematic departure from the unmodified noun's stereotype both with the addition of stereotypical modifiers ("Quacking ducks have webbed feet" versus "Ducks have webbed feet") and with the addition of a second modifier ("Baby Peruvian ducks have webbed feet" versus "Baby ducks have webbed feet"). Thus, in the general case the stereotypical properties of a head noun are systematically discounted when that head noun combines with modifiers. This effect represents a general principle of conceptual combination that argues against the inheritance of stereotypical features of concepts as a default strategy. Instead, we advocate a model of conceptual combination where concepts remain inert under combination, supported by a separate machinery that introduces pragmatic and knowledge-dependent inferences.     

Increased exposure and phonetic context help listeners recognize allophonic variants

This study examines the influence of increased exposure and phonetic context on the recognition of words that are produced with nasal flaps in American English (e.g., the word center produced as cenner). Previous work has shown that despite their high frequency of occurrence, words produced with nasal flaps are recognized more slowly and less accurately compared with canonical pronunciation variants produced with /nt/, which occur less frequently. We conducted two experiments in order to investigate how exposure and phonetic context influence this reported processing disadvantage for flapped variants. Experiment 1 demonstrated that the time to recognize flapped variants presented in isolation decreased over the course of the experiment, while accuracy increased. Experiment 2 replicated this finding and showed further that flapped variants that were presented in a casually produced sentence context were recognized faster compared with flapped variants presented in a carefully produced sentence context. Interestingly, the effect of context emerged only in late responses and was present only for flapped but not for canonical variants. Our results thus show that increased exposure and phonetic context help listeners recognize allophonic variants. This finding provides further support for the notion that listeners are flexible and adapt to phonetic variation in speech.     

Form-based priming in spoken word recognition: the roles of competition and bias.

Phonological priming of spoken words refers to improved recognition of targets preceded by primes that share at least one of their constituent phonemes (e.g., BULL-BEER). Phonetic priming refers to reduced recognition of targets preceded by primes that share no phonemes with targets but are phonetically similar to targets (e.g., BULL-VEER). Five experiments were conducted to investigate the role of bias in phonological priming. Performance was compared across conditions of phonological and phonetic priming under a variety of procedural manipulations. Ss in phonological priming conditions systematically modified their responses on unrelated priming trials in perceptual identification, and they were slower and more errorful on unrelated trials in lexical decision than were Ss in phonetic priming conditions. Phonetic and phonological priming effects display different time courses and also different interactions with changes in proportion of related priming trials. Phonological priming involves bias; phonetic priming appears to reflect basic properties of activation and competition in spoken word recognition.