Semantic and phonological influences on the processing of words and pseudohomophones

In two experiments, we investigated the relationship between semantics and phonology in the lexical decision task. In the first experiment, lexical decisions to words with large semantic neighborhoods were faster than those to words with sparse semantic neighborhoods. Conversely, this effect of semantic neighborhood was reversed for pseudohomophones (e.g., nale). That is, pseudohomophones based on words with large semantic neighborhoods took longer to reject than did those based on words with sparse semantic neighborhoods. In the second experiment, we found the magnitude of the semantic neighborhood effect for words to be a function of nonword foil type. Taken together, these results indicate that semantic neighborhood size affects processing of both words and pseudohomophones, and that the effect of semantic neighborhood size for words is more pronounced when pseudohomophone foils are employed. These effects are discussed in terms of a model in which the orthographic, phonological, and semantic systems are fully interactive.     

Task preparation in macaque monkeys (<Emphasis Type="Italic">Macaca mulatta</Emphasis>)

We investigated whether macaque monkeys possess the ability to prepare abstract tasks in advance. We trained two monkeys to use different stimulus-response (S-R) mappings. On each trial, monkeys were first informed with a visual cue which of two S-R mapping to use. Following a delay, a visual target was presented to which they would respond with a left or right button-press. We manipulated delay time between cue and target and found that performance was faster and more accurate with longer delays, suggesting that monkeys used the delay time to prepare each task in advance. Electronic Publication     

Editorial

Editorial Introduction

Editorial     

The Risk and Protective Functions of Perceived Family and Peer Microsystems Among Urban Adolescents in Poverty

Utilized a pattern-based approach to discover the different constellations of perceived social transactions separately for family and peer systems and explored the risk and protective functions of these microsystem profiles for both depression and antisocial behavior among a sample of ethnically and racially diverse urban adolescents living in poverty. Measures of perceived social support, involvement and hassles with family and peers, as well as perceived social acceptance and peers' values were entered into two sets of iterative cluster analyses to identify distinct profiles of family and peer transactions. From each of the perceived family and peer transactional analyses, six replicated profiles emerged. Several of the profiles were consistent with expectations from prior literature such as Enmeshing families and Rejecting peer networks, while others were novel and intriguing such as Entangling peers. Family profiles were consistent in their risk and protective associations for both depression and antisocial behavior, while the peer profiles varied in their effects for each developmental outcome. For example, the Rejecting peer profile placed adolescents at increased risk for depression but protected them from antisocial behavior. Implications for future research and preventive intervention are discussed.     

On the relevance of locus equations for production and perception of stop consonants

We examined the possible relevance of locus equations to human production and perception of stop consonants. The orderly output constraint (OOC) of Sussman, Frachter, and Cable (1995) claims that humans have evolved to produce speech such thatF2 at consonant release andF2 at vowel midpoint are linearly related for consonants so that developing perceptual systems can form representations in anF2 _ons-by-F2 _vowel space. The theory claims that this relationship described by locus equations can distinguish consonants, and that the linearity of locus equations is captured in neural representations and is thus perceptually relevant. We investigated these claims by testing how closely locus equations reflect the production and perception of stop consonants. In Experiment 1, we induced speakers to change their locus equation slope and intercept parameters systematically, but found that consonants remained distinctive in slope-by-intercept space. In Experiment 2, we presented stop-consonant syllables with their bursts removed to listeners, and compared their classification error matrices with the predictions of a model using locus equation prototypes and with those of an exemplar-based model that usesF2 _ons andF2 _vowel, but not locus equations. Both models failed to account for a large proportion of the variance in listeners’ responses; the locus equation model was no better in its predictions than the exemplar model. These findings are discussed in the context of the OOC.     

Graph-theoretic representations for proximity matrices through strongly-anti-Robinson or circular strongly-anti-Robinson matrices

There are various optimization strategies for approximating, through the minimization of a least-squares loss function, a given symmetric proximity matrix by a sum of matrices each subject to some collection of order constraints on its entries. We extend these approaches to include components in the approximating sum that satisfy what are called the strongly-anti-Robinson (SAR) or circular strongly-anti-Robinson (CSAR) restrictions. A matrix that is SAR or CSAR is representable by a particular graph-theoretic structure, where each matrix entry is reproducible from certain minimum path lengths in the graph. One published proximity matrix is used extensively to illustrate the types of approximation that ensue when the SAR or CSAR constraints are imposed.The authors are indebted to Boris Mirkin who first noted in a personal communication to one of us (LH, April 22, 1996) that the optimization method for fitting anti-Robinson matrices in Hubert and Arabie (1994) should be extendable to the fitting of strongly anti-Robinson matrices as well.     

When writing helps to heal: E-mail as therapy

A new form of therapy termed therap-e-mail, developed by the authors for use in their Internet-based counselling service Therapy Online, is explained. Two major challenges that have been brought up by other professionals concerning on-line therapy are addressed, and solutions to these challenges are proposed. Five significant advantages of therap-e-mail are discussed The need for research, and the implications for guidance and counselling, are addressed     

The mental illness defense in the capital penalty hearing

Several defense strategies are available to the capital defendant who is arguing for life in the penalty phase, including a mental illness (MI) defense. An MI defense presents psychiatric testimony to the effect that the defendant was mentally disturbed at the time of the offense and, therefore, should not be held completely responsible. The few studies available suggest that an MI defense will be ineffective because (1) death-qualified jurors do not respond favorably to purely psychological explanations of criminal behavior and (2) an MI defense may erroneously mislead the jury regarding the defendant's unpredictability and dangerousness. Analagous studies of insanity acquittals suggest certain factors that may be associated with a succesful MI defense.