Mental scanning in auditory imagery for songs.

Four experiments examined how people operate on memory representations of familiar songs. The tasks were similar to those used in studies of visual imagery. In one task, subjects saw a one word lyric from a song and then saw a second lyric; then they had to say if the second lyric was from the same song as the first. In a second task, subjects mentally compared pitches of notes corresponding to song lyrics. In both tasks, reaction time increased as a function of the distance in beats between the two lyrics in the actual song, and in some conditions reaction time increased with the starting beat of the earlier lyric. Imagery instructions modified the main results somewhat in the first task, but not in the second, much harder task. The results suggest that song representations have temporal-like characteristics. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Video games and aggressive thoughts, feelings, and behavior in the laboratory and in life.

Two studies examined violent video game effects on aggression-related variables. Study 1 found that real-life violent video game play was positively related to aggressive behavior and delinquency. The relation was stronger for individuals who are characteristically aggressive and for men. Academic achievement was negatively related to overall amount of time spent playing video games. In Study 2, laboratory exposure to a graphically violent video game increased aggressive thoughts and behavior. In both studies, men had a more hostile view of the world than did women. The results from both studies are consistent with the General Affective Aggression Model, which predicts that exposure to violent video games will increase aggressive behavior in both the short term (e.g., laboratory aggression) and the long term (e.g., delinquency). (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

It's the thought that counts: The role of hostile cognition in shaping aggressive responses to social exclusion.

Prior research has confirmed a casual path between social rejection and aggression, but there has been no clear explanation of why social rejection causes aggression. A series of experiments tested the hypothesis that social exclusion increases the inclination to perceive neutral information as hostile, which has implications for aggression. Compared to accepted and control participants, socially excluded participants were more likely to rate aggressive and ambiguous words as similar (Experiment 1a), to complete word fragments with aggressive words (Experiment 1b), and to rate the ambiguous actions of another person as hostile (Experiments 2-4). This hostile cognitive bias among excluded people was related to their aggressive treatment of others who were not involved in the exclusion experience (Experiments 2 and 3) and others with whom participants had no previous contact (Experiment 4). These findings provide a first step in resolving the mystery of why social exclusion produces aggression. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Auditory scene analysis in European starlings (Sturnus vulgaris): Discrimination of song segments, their segregation from multiple and reversed conspecific songs, and evidence for conspecific song categorization.

The ability of male European starlings (Sturnus vulgaris) to perceive conspecific song amid a variety of background distractor conditions was investigated. In Experiment 1, test starlings rapidly discriminated 10 song segments produced by conspecific Starling A from 10 song segments produced by Starling B. Experiment 2 demonstrated that birds maintained the A vs. B discrimination against a background of song from a novel singer, Starling C. Experiment 3 demonstrated that birds could discriminate song segments from Starling A and Starling B amid superimposed distractor songs from 4 conspecifics. Experiment 4 demonstrated that the Starling A vs. Starling B discrimination could be maintained in the presence of starling song played backward. Experiments 1 and 5 suggested that test starlings were treating the A and B songs as open-ended, possibly abstract, auditory categories. Thus, starlings identify and discriminate conspecific songs amid many types of conspecific distractors. The results are well described by principles of auditory scene analysis. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Characterization of four toxins from Buthus martensi scorpion venom, which act on apamin-sensitive Ca2+-activated K+ channels

What are the relative roles of imitation, improvisation and invention in the development of large song repertoires in species of the songbird family Mimidae? This question was addressed in a laboratory study of the vocal development of young grey catbirds, Dumetella carolinensiscollected from western Massachusetts. Two groups heard a repeated 10-s, tape-tutored segment of catbird song, two other groups heard a repeated 16-min segment and a fifth group heard no tape-tutored songs. One male selected for study from each group developed a large repertoire of seemingly normal songs, and wild males responded strongly to songs of the male that had heard no tape-tutored song. Relying little on precise imitation and largely on improvising or inventing, each male developed a highly unique repertoire. A geographical survey of catbird song revealed little to no evidence of song sharing or microgeographical variation, which is consistent with the idea that imitation plays a relatively minor role in song development. Perhaps simultaneous selection for large repertoires and reduced geographical variation has led to such an emphasis on song individuality and non-imitative developmental processes.     

I wish I were a warrior: The role of wishful identification in the effects of violent video games on aggression in adolescent boys.

This study tested the hypothesis that violent video games are especially likely to increase aggression when players identify with violent game characters. Dutch adolescent boys with low education ability (N=112) were randomly assigned to play a realistic or fantasy violent or nonviolent video game. Next, they competed with an ostensible partner on a reaction time task in which the winner could blast the loser with loud noise through headphones (the aggression measure). Participants were told that high noise levels could cause permanent hearing damage. Habitual video game exposure, trait aggressiveness, and sensation seeking were controlled for. As expected, the most aggressive participants were those who played a violent game and wished they were like a violent character in the game. These participants used noise levels loud enough to cause permanent hearing damage to their partners, even though their partners had not provoked them. These results show that identifying with violent video game characters makes players more aggressive. Players were especially likely to identify with violent characters in realistic games and with games they felt immersed in. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Hostility, cigarette smoking and alcohol consumption in the general population

Hostility has been associated with coronary heart disease, and hostility may affect coronary risk through its influence on risk factors such as cigarette smoking and alcohol consumption. The objective of this study was to determine relationships between hostile personality, cigarette smoking and alcohol consumption in the general population. The Edinburgh Artery Study comprises a cross-sectional survey of 1592 men and women aged 55-74 years sampled from age-sex registers of 10 general practices throughout the city. The Bedford-Foulds Personality Deviance Questionnaire was used to elicit extrapunitiveness (including hostile thoughts), dominance (including hostile acts) and intropunitiveness. Social class, age and deprivation score were controlled for in multivariate analyses. The hostile thoughts scale emerged as a significant independent predictor of alcohol consumption in men and women (P < or = 0.01), and the models accounted for 4-9% of the variance in alcohol consumption. Hostile acts were independently predictive of smoking in men (P < or = 0.001), with the model accounting for 5% of the variance in smoking. Hostile thoughts were independently predictive of smoking in women (P < or = 0.001), and the model accounted for 4% of the variance in their smoking. We conclude that hostility may affect coronary risk through its influence on lifestyle-related coronary risk factors, although in future further elucidation of hostility type and standard measurement of hostility are necessary.     

Violent thoughts and violent behavior following hospitalization for mental disorder.

Using a standardized schedule of questions, this study examined (a) the prevalence of self-report of violent thoughts by patients hospitalized for mental disorders compared with nonpatients, (b) the persistence of violent thoughts after discharge, and (c) the relation between patients' violent thoughts while hospitalized and violent acts within 20 weeks after hospital discharge. About 1/3 of the patients reported thoughts of violence while hospitalized, more than twice the proportion found among nonpatients. Reporting violent thoughts in hospital was significantly related to engaging in violent acts within 20 weeks after discharge for non-White patients, patients without major mental disorder but with substance abuse diagnoses, patients with high symptom severity, and patients whose reports of violent thoughts persisted after discharge. Reporting violent thoughts was significantly related to measures of psychopathy, anger, and impulsiveness. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Does Zebra finch (Taeniopygia guttata) preference for the (familiar) father's song generalize to the songs of unfamiliar brothers?

Several studies have demonstrated that zebra finches (Taeniopygia guttata) prefer their fathers' songs over unfamiliar songs. Songs of tutors (i.e., fathers) and tutees (i.e., sons) resemble each other as a result of cultural transmission. Subjects (N=18) with a previously established preference for the father's song could choose between the song of an unfamiliar brother or a random unfamiliar song in an operant task. Most subjects showed a significant preference for either category of song, but overall, the songs of unfamiliar brothers were not preferred, although they were more similar to the father's song than were the unfamiliar songs. This suggests that subjects did not generalize their learned preference for a song of a particular tutor to the songs of his tutees. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Articulated thoughts of maritally violent and nonviolent men during anger arousal.

The cognitive correlates of anger arousal were investigated in community-based samples of maritally violent (MV), maritally distressed-nonviolent (DNV), and maritally satisfied-nonviolent (SNV) husbands. Participants performed the Articulated Thoughts in Simulated Situations (ATSS) paradigm while listening to anger-arousing audiotapes. Trained raters coded for irrational beliefs, cognitive biases, hostile attributional biases, and anger control statements. Results indicated that MV men articulated significantly more irrational thoughts and cognitive biases than DNV and SNV men. MV men articulated more hostile attributional biases than DNV and SNV men across all ATSS scenarios. SNV men, however, articulated more anger control statements during ATSS anger arousal than MV or DNV participants. Discriminant function analyses indicated that specific thoughts discriminated between the groups and differentiated mildly from severely violent Ss. ATSS cognitive distortions (a) were not correlated with questionnaire measures of cognitive distortion, and (b) were superior to questionnaire measures in discriminating between the groups. The findings are interpreted in light of recent advances in understanding the relationship between information processing, anger, and marital aggression. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Psychopathy in instrumental and reactive violent offenders.

Can violent offenders who commit acts of instrumental aggression for goal-oriented purposes such as robbery be distinguished from those who commit acts of reactive (or hostile) aggression in response to provocation? Because violent offenders often have a history of both instrumental and reactive aggression, this study distinguished between offenders with a history of at least 1 instrumental violent offense and offenders with a history of reactive violent offenses. Two studies tested the hypothesis that instrumental offenders would score higher than reactive offenders and nonviolent offenders on R. D. Hare's (1991) Psychopathy Checklist. The first study sample consisted of 106 violent and nonviolent offenders recruited from a medium-security correctional facility. The second study sample consisted of 50 violent offenders referred for pretrial forensic evaluation. In both samples, instrumental offenders could be reliably distinguished from reactive offenders on the basis of violent crime behavior and level of psychopathy. Group differences could not be attributed to participant age, race, length of incarceration, or extent of prior criminal record. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Anger, hostility, and depression in domestically violent versus generally assaultive men and nonviolent control subjects.

Anger, hostility, and depression were examined across four groups: a clinical sample of domestically violent men, two samples of more generally assaultive men, and a nonviolent control group. All subjects (N?=?129) were assessed using the Buss-Durkee Hostility Inventory, the Hostility and Direction of Hostility Questionnaire, and the Beck Depression Inventory. The domestically violent men and the generally assaultive men evidenced significantly higher levels of anger and hostility than the control subjects. The anger and hostility scores were very similar in the domestically violent and the generally assaultive men. However, the domestically violent men were more likely to be significantly depressed. The findings support the idea that anger dyscontrol is a key issue in the psychological profile of domestically violent men and indicate the need for clinical attention to depression as well as anger. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Projection of hostility on the TAT as a function of stimulus, background, and personality variables.

The effects of stimulus, background, and personality factors on the TAT were examined. Stimulus was measured by scaling the TAT for hostility and background by use of 2 instructional sets, "look your best" and "impersonal," and personality, by selecting via pooled rankings, 96 college men and women from an initial sample of 802 who were extremely hostile or friendly (group judgments) and who thought of themselves as hostile or friendly. Hypotheses that hostile persons would not project more hostility than friendly persons, but persons with hostile self-concepts would project more hostility than persons with friendly self-concepts were confirmed. The stimulus was the most important determinant of response, and low and medium hostile cards better than highly hostile ones in discriminating groups. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Social-cognitive processes of severly violent, moderately aggressive, and nonaggressive boys.

Examined social–cognitive processes of aggressive and nonaggressive boys at preadolescent and early adolescent age levels. The social-cognitive variables included processing of cues, attributions, social problem solving, affect labeling, outcome expectations, and perceived competence and self-worth. Results indicated that a wide range of social-cognitive processes is distorted and deficient for violent and moderately aggressive children, and that different types of social cognition contribute unique variance in discriminating among groups. Severely violent boys at both age levels had difficulties with cue recall, attributions, social problem solving, general self-worth, and a pattern of endorsing unusually positive affects that they may experience in different settings. Moderately aggressive boys shared some of the social-cognitive difficulties demonstrated by severely violent boys, but they also displayed indications that their aggression may be more planfully aimed to achieve expected outcomes. When the moderately aggressive and the violent boys differed from the nonaggressive boys on attributional biases and low perceived self-worth, a continuum existed with violent boys displaying more extreme social-cognitive dysfunctions than the moderately aggressive boys. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Early experience and plasticity of song in adult male zebra finches (Taeniopygia guttata).

Zebra finches (Taeniopygia guttata) learn song primarily at 35–65 days of age, but birds deprived of experience at that stage may modify their songs later. Experiments on 5 groups examined the effect of varying early social experience on the plasticity of adult song. Major changes of song in adulthood were rare, and new syllables were memorized only in the more socially impoverished groups. Most songs underwent minor changes, in syllable structure or stereotypy, as well as in the addition or deletion of syllables. Two factors appeared to be important in determining the amount of change: the extent of social deprivation that the bird had experienced and, in the case of group-reared birds, the degree of song matching between social companions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Song learning in brood-parasitic indigobirds Vidua chalybeata: song mimicry of the host species

Brood-parasitic village indigobirds, Vidua chalybeata, were bred in captivity and foster-reared by their normal host, red-billed firefinch, Lagonosticta senegala, or by an experimental foster species, Bengalese finch, Lonchura striata. Male indigobirds reared by Bengalese finches developed the songs of Bengalese finches, and males reared by firefinches developed songs of firefinches. Males copied their foster father only when they had lived with him long after independence (45 days post-fledging), while males separated normally at independence (22-24 days post-fledging) copied songs of other individuals and not songs of their foster father. Males reared by Bengalese finches showed no preference to learn firefinch song over songs of the experimental foster species or other control finch species even when they had lived with firefinches as companions from the time of fledging to independence. Males copied several song themes, acquired the same number of mimicry songs, and acquired their songs at the same age, whether reared by Bengalese finches or by firefinches. When they lived with other indigobirds, the male indigobirds copied mimicry songs of male indigobirds that mimicked the same foster species. We predicted mimicry-song specificity and repertoire size in experimental indigobirds from a hypothesis of an early developmental period when young indigobirds focus their attention on their foster parents, and a later period when they direct their attention to other birds with similar songs. The predictions, based on field observations of wild birds, were that (1) males reared by a novel foster species other than the normal host would learn the song of that foster species, and (2) males that left their foster parents at the normal time of independence would copy the songs of other individuals, including other adult indigobirds that mimicked the same foster species. Begging calls of young indigobirds did not mimic the calls of young firefinches. Indigobirds reared alone, or with young of the normal host or of the experimental foster species, all developed begging calls in adult song that resembled their own begging as nestlings and fledglings, and only males that heard other adult indigobirds with firefinch-mimicry begging developed firefinch begging in their song. The incorporation of the innate begging calls as well as the learned begging calls into adult song, and the modification of the song themes of their individual song models, suggest that song development involves processes in addition to copying the songs of their own foster species and of older adult male indigobirds with songs like their own foster parents. Copyright 1998 The Association for the Study of Animal Behaviour. Copyright 1998 The Association for the Study of Animal Behaviour.     

Biased decision-making processes in aggressive boys.

Recent evidence has suggested that aggressive boys demonstrate a bias toward attributing hostility to peers in unwarranted circumstances. The present study explored 2 aspects of cognitive processing that might be related to attributional bias: speed of decision making and selective recall of hostile cues. 81 aggressive and nonaggressive boys at 3 age levels (kindergarten–2st grade, 2nd–3rd, and 4th–5th) participated in a detective game in which the task was to accumulate evidence to decide whether or not a peer had acted with benevolence or hostility. Aggressive boys were found to respond more quickly and with less attention to available social cues. They also overattributed hostility to peers in unwarranted circumstances, but only when they responded quickly. This restriction suggests that training aggressive boys to respond more slowly could lead to fewer biased attributions on their part. Selective recall was also related to biased attributions for both groups of boys. This suggests that training boys to recall all cues nonselectively could reduce the frequency of their biased attributions. Results are discussed in terms of a cognitive model of aggressive behavior. (16 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Conspecific song perception in zebra finches (Taeniopygia guttata)

Adult male and female zebra finches (Taeniopygia guttata), previously trained with operant conditioning to discriminate between conspecific songs, were tested to determine their dependence on 2 properties of songs, the presence of song syllables and the temporal order of songs. The removal of song syllables disrupted discrimination performance but usually only if the stimulus was the bird's own song. All birds initially failed to identify reversed songs correctly, but males relearned discriminations with reversed songs in fewer trials than did females. The results suggest that there are 3 levels of song perception: a bird's own song, other males' songs as processed by males, and songs as processed by females. Each of these levels correlates with the known electrophysiological and neuroanatomical properties of the song system and with the natural history of song.     

The stimulating effects of a vicarious aggressive activity.

Previous research had demonstrated the reductive as well as the stimulation effect of aggressive activity upon feelings of aggression. To explain this inconsistency, it was herein assumed that unless the original hostile intent was aroused at the time of vicarious aggressive activity, reduction in feelings of hostility would not occur. Measurement of aggressive feelings was in terms of responses in a word association test and an attitude questionnaire. Exposure to personal insult and a film depicting aggressive activity interacted to produce less manifest hostility than groups exposed to a neutral film. The Ss' answers to the projective were different from these on the more structured test; suggested the inhibitory presence of guilt. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Breeding context and response to song playback in mockingbirds (Mimus polyglottos).

Northern mockingbirds (Mimus polyglottos) sing more during nest building than at any other time in the breeding cycle. Playback tests in which the songs of nest-building and unmated males were played to mated males during incubation and nest building were conducted to determine if nest-building song is a mate guarding signal. Analyses indicated no greater aggressive response to song during nest building versus incubation in mated males. Singing itself was never evoked by song playback, and neither mated nor unmated males responded differently to songs produced by unmated versus nest-building males. The aggressive responses of unmated males were greater than those of mated males nest building without offspring, and males nest building with older offspring present responded as much as unmated males and more than males nest building without offspring. Aggressive response to song playback in once-mated males, whose mates disappeared during the breeding season, did not change as much as two months after disappearance of the mate. Nonetheless, ambient song production increased significantly above that apparent in the same birds when mated. These experiments indicate that aggressive reaction to song playback fluctuates across breeding contexts but not as predicted by the use of song as a mate guarding signal and not in a manner that parallels natural fluctuations in song production. (PsycINFO Database Record (c) 2010 APA, all rights reserved)