Intellectual ability and aggressive behavior in nonclinical-nonforensic males

The purpose of this study was to test the relationship between IQ and physical aggression in a nonclinical-nonforensic male sample in a laboratory setting. Thirty males completed an abbreviated version of the Wechsler Adult Intelligence Scale—Revised. Aggression was measured using a modified version of the Taylor reaction-time (RT) aggression paradigm in which subjects competed on a RT task and both received and delivered shocks to a fictitious opponent in provoking and nonprovoking conditions. Provocation conditions (High and Low) were defined by the intensity of shocks the subjects received. Results demonstrated strong inverse correlations between IQ and aggressive behavior under both High and Low Provocation conditions.     

Allophonic mode of speech perception in dyslexia

Perceptual discrimination between speech sounds belonging to different phoneme categories is better than that between sounds falling within the same category. This property, known as "categorical perception," is weaker in children affected by dyslexia. Categorical perception develops from the predispositions of newborns for discriminating all potential phoneme categories in the world's languages. Predispositions that are not relevant for phoneme perception in the ambient language are usually deactivated during early childhood. However, the current study shows that dyslexic children maintain a higher sensitivity to phonemic distinctions irrelevant in their linguistic environment. This suggests that dyslexic children use an allophonic mode of speech perception that, although without straightforward consequences for oral communication, has obvious implications for the acquisition of alphabetic writing. Allophonic perception specifically affects the mapping between graphemes and phonemes, contrary to other manifestations of dyslexia, and may be a core deficit.     

Intellectual ability correlates of the Marlowe-Crowne Social Desirability Scale

The hypothesis that the Marlowe-Crowne Scale would be negatively related to a variety of intellectual ability measures was investigated in a sample of college students. As predicted, MC scores were negatively correlated with measures of intelligence (Quick Test), associational ability (Remote Associates Test), and academic achievement (course grades). These results suggest that the vulnerable self-esteem and defensiveness traditionally ascribed to high versus low MC scorers may at least in part, reflect a history of poorer performance in intellectual and academically related activities.     

The case against a speech mode of perception

On the basis of evidence from six areas of speech research, it is argued that there is no reason to assume that speech stimuli are processed by structures that are inherently different from structures used for other auditory stimuli. It is concluded that speech and non-speech auditory stimuli are probably perceived in the same way.     

Pitch direction ability predicts melodic perception in autism

Individuals with autism spectrum disorders (ASDs) often present atypical auditory perception. Previous work has reported both enhanced low-level pitch discrimination and superior abilities to detect local pitch structure on higher-level melodic tasks in ASD. However, it is unclear how low and high levels of auditory perception are related in ASD or typical development (TD), or how this relationship might change across development and stimulus presentation rates. To these aims, in the present study, children with ASD and TD were tested on a low-level pitch direction discrimination task and a high-level melodic global-local task. Groups performed similarly on both of these auditory tasks. Moreover, individual differences in low-level pitch direction ability predicted performance on the higher-level global-local task, with a stronger relationship in ASD. Age did not affect the relationship between low-level and high-level pitch performance in either ASD or TD. However, there was a more positive effect of age on the high-level global-local task performance in TD than ASD. Finally, there was no effect of stimulus rate on the relationship between low-level and high-level pitch performance in either group. These findings provide a better understanding of how perception is associated across levels of processing in ASD versus TD. This work helps to better understand individual differences in auditory perception and to refine ASD phenotypes.     

Speech perception and memory coding in relation to reading ability

Previous work has demonstrated that children who are poor readers have short-term memory deficits in tasks in which the stimuli lend themselves to phonetic coding. The aim of the present study was to explore whether the poor readers' memory dificit may have its origin in perception with the encoding of the stimuli. Three experiments were conducted with third grade good and poor readers. As in earlier experiments, the poor readers were found to perform less well on recall of random word strings and to be less affected by the phonetic characteristics (rhyming or not rhyming) of the items (Experiment 1). In addition, the poor readers produced more errors of transposition (in the nonrhyming strings) than did the good readers, a further indication of the poor readers' problems with memory for order. The subjects were tested on two auditory perception tasks, one employing words (Experiment 2) and the other nonspeech environmental sounds (Experiment 3). Each was presented under two conditions: with a favorable signal-to-noise ratio and with masking. The poor readers made significantly more errors than the good readers when listening to speech in noise, but did not differ in perception of speech without noise or in perception of nonspeech environmental sounds, whether noise-masked or not. Together, the results of the perception studies suggest that poor readers have a perceptual difficulty that is specific to speech. It is suggested that the short-term memory deficits characteristic of poor readers may stem from material-specific problems of perceptual processing.     

Sex differences in facial emotion perception ability across the lifespan

Perception of emotion in the face is a key component of human social cognition and is considered vital for many domains of life; however, little is known about how this ability differs across the lifespan for men and women. We addressed this question with a large community sample (N?=?100,257) of persons ranging from younger than 15 to older than 60 years of age. Participants were viewers of the television show “Tout le Monde Joue”, and the task was presented on television, with participants responding via their mobile devices. Applying latent variable modeling, and establishing measurement invariance between males and females and across age, we found that, for both males and females, emotion perception abilities peak between the ages of 15 and 30, with poorer performance by younger adults and declining performance after the age of 30. In addition, we show a consistent advantage by females across the lifespan, which decreases in magnitude with increasing age. This large scale study with a wide range of people and testing environments suggests these effects are largely robust. Implications are discussed.     

Subjective time perception and behavioral activation system strength predict delay of gratification ability

This study investigated the relationship between subjective time perception and behavioral impulsivity in a healthy, undergraduate population. Data were collected from 62 participants on internal clock speed (ICS, a measure of subjective time perception), behavioral impulsivity, intelligence, and Behavioral Inhibition and Activation Strengths (BIS and BAS). As expected, after controlling for other significant predictors, ICS accounted for a significant amount of variance in behavioral impulsivity. Surprisingly, participants who had slower ICSs were more behaviorally impulsive than participants who had faster ICSs. In addition, and as anticipated, participants who had less accurate ICSs were significantly more impulsive than participants who were more accurate. Last, higher BAS significantly predicted decreased behavioral impulsivity. Results are discussed in terms of current theory relating ICS to impulsivity, and a new theoretical framework is advanced.     

Seeing and doing: ability to act moderates orientation effects in object perception

We investigated whether the impact of an object's orientation on a perceiver's actions (an orientation effect) is moderated by the perceiver's ability to act on the object in question. To do this, we manipulated the physical location of presented objects (Experiment 1) and the perceiver's action capacity (Experiment 2). Regardless of the physical distance of the object, manual responses were sensitive to the object's orientation (the orientation effect) when the object was within the participant's action range but not when the object was outside of the action range. These results support an embodied view of object perception and shed light on peripersonal space representation.     

Intellectual ability in young men separated temporarily from their parents in childhood

We examined the effects of early life stress (ELS) on intellectual ability in 2,725 20-year-old male participants, of whom 321 were separated temporarily (mean 1.7 years) from both their parents during World War II, at an average age of 4.3 years. Intellectual ability was tested when entering compulsory military service. The separated men had − 0.28 (95% CI − 0.39, − 0.16), − 0.13 (95% CI − 0.25, − 0.01), − 0.18 (95% CI − 0.29, − 0.06), and − 0.19 (95% CI − 0.30, − 0.07) SD units lower verbal, visuospatial, arithmetic, and composite score of intellectual ability, respectively, compared to non-separated. Participants who were separated for more than a year and between two and four years had the lowest ability scores. ELS showed most consistent associations with verbal ability, but were not limited to it. Children beyond infancy and before their school-age may be the most vulnerable to the adverse effects of the ELS.     

Relationship between expressive language ability and rhythm perception, pitch perception, vocal range, and vocal midpoint among mentally retarded adults

This study investigated the relationship between expressive language ability and rhythm perception, pitch perception, vocal range, and vocal midpoint for 28 mentally retarded adults. A standardized speech test determined language scores, a standardized music test assessed rhythm and pitch perception, and vocalization determined vocal range and midpoint. Multiple correlation and multiple linear regression analyses indicated a significant correlation between expressive language ability and rhythm perception. Further research with music tests more appropriate for mentally retarded adults is recommended.     

The impact of mode of presentation on gender differences in social perception

This research investigated the conditions under which males might perceive sexuality in females in heterosexual interactions (the Abbey effect). Caucasian male and female couples participated in a brief interaction in which they were rated by observers. Interactants also rated themselves as well as their partners. These live interactions were videotaped, audiotaped, and photographed, and subsequently rated by other observers (subjects). Subjects made ratings on a variety of dimensions, including adjectives relating to the sexuality of the interactants as well as the interactants' desire for future interaction with their partners. Results indicated that males attributed more sexuality and a higher desire for future interactions to females they observed or with whom they interacted than females did. Further, the tendency to attribute sexuality was affected by way in which stimuli were presented to the raters. Photos, which had the least amount of information relative to the other methods, produced the highest sexuality and future interaction ratings, suggesting that stereotyping might play a role. Implications of the results and future research are discussed.This research was based on a master's thesis conducted by the first author under the direction of the second author. We gratefully acknowledge the assistance of Anthony J. Conger in the design and analysis of this research.To whom reprint requests should be addressed at Purdue University, Department of Psychological Sciences, West Lafayette, IN 47907.