Toddlers use speech disfluencies to predict speakers' referential intentions

The ability to infer the referential intentions of speakers is a crucial part of learning a language. Previous research has uncovered various contextual and social cues that children may use to do this. Here we provide the first evidence that children also use speech disfluencies to infer speaker intention. Disfluencies (e.g. filled pauses 'uh' and 'um') occur in predictable locations, such as before infrequent or discourse-new words. We conducted an eye-tracking study to investigate whether young children can make use of this distributional information in order to predict a speaker's intended referent. Our results reveal that young children (ages 2;4 to 2;8) reliably attend to speech disfluencies early in lexical development and are able to use disfluencies in online comprehension to infer speaker intention in advance of object labeling. Our results from two groups of younger children (ages 1;8 to 2;2 and 1;4 to 1;8) suggest that this ability emerges around age 2.     

Physical Activity, Life Satisfaction, and Self-Rated Health of Middle School Students

Little research has examined the association between life satisfaction, self-rated health (SRH), and physical activity concurrently for middle school students. A convenience sample of 245 students in grades 7 and 8 was surveyed about physical activity, life satisfaction, and SRH using the U.S. Centers for Disease Control and Prevention (CDC) 2005 Middle School Youth Risk Behavior Survey. ANOVA analyses revealed significantly reduced life satisfaction for females who reported not engaging in vigorous physical activity during the past 7 days [p < .01, effect size (ES) = .75]. Significantly reduced life satisfaction was detected for both males (p < .001, ES = .66) and females (p < .0001, ES = .80) who reported not playing on sports teams. Additionally, logistic regression analyses showed the odds of reporting fair/poor SRH increased 5.4 times for males (CI = 1.30–22.39, p < .05) and 30.9 times for females (CI = 3.74–255.43, p < .001) who reported not playing on sports teams. Preliminary findings suggest physical activity and sports participation is associated with improved life satisfaction and SRH for middle school students. In addition, although some gender differences were observed, consistent findings for sports participation suggest sports participation may carry multiple social, mental, and physical benefits for youth.     

Temporary inactivation of the dorsal entorhinal cortex impairs acquisition and retrieval of spatial information

We tested the effects of temporary inactivation of the dorsal entorhinal cortex on spatial discrimination using a conditioned cue preference (CCP) paradigm. The three phases of the procedure were: pre-exposure: unreinforced exploration of the center platform and two adjacent arms of an eight-arm radial maze; training: rats were confined to the ends of the two arms on alternate days – one arm always contained food and the other never contained food; testing: unreinforced exploration of the center platform and the two arms. Rats that received bilateral infusions of saline into the dorsal entorhinal cortex before the training trials or before the test trial spent significantly more time in the arm that previously contained food than in the arm that never contained food, demonstrating that they had acquired and were able to express information that discriminated between the two adjacent maze arms. In contrast, rats that received bilateral, intra-entorhinal infusions of muscimol, a gamma-aminobutyric acid_a (GABA_a) agonist, before either training or testing spent equal amounts of time in the two arms, indicating that they failed to acquire and were unable to express this information. Interactions between the entorhinal cortex and hippocampus in the acquisition and expression of the information required for this discrimination are discussed.     

Mobile phone use while driving: An investigation of the beliefs influencing drivers’ hands-free and hand-held mobile phone use

This study explored the psychological influences of hands-free and hand-held mobile phone use while driving. Participants were 796 Australian drivers aged 17–76 years who owned mobile phones. A cross-sectional survey assessed frequency of calling and text messaging while driving (overall, hands-free, hand-held) as well as drivers’ behavioural, normative, and control beliefs relating to mobile phone use while driving. Irrespective of handset type, 43% of drivers reported answering calls while driving on a daily basis, followed by making calls (36%), reading text messages (27%), and sending text messages (18%). In total, 63.9% of drivers did not own hands-free kits and, of the drivers that owned hand-free kits, 32% did not use it most or all of the time. Significant differences were found in the behavioural, normative, and control beliefs of frequent and infrequent users of both types of handset while driving. As expected, frequent users reported more advantages of, more approval from others for, and fewer barriers that would prevent them from, using either a hands-free or a hand-held mobile phone while driving than infrequent users. Campaigns to reduce mobile phone use while driving should attempt to minimise the perceived benefits of the behaviour and highlight the risks of this unsafe driving practice.     

Indirect peer aggression in adolescence and reproductive behavior

Evolutionary psychologists have suggested that indirect aggression during adolescence is a strategy to compete with same-sex peer rivals for resources, status, and mating opportunities. We collected survey data on 143 young adults to determine retrospectively, the amount of indirect aggressive behavior they perpetrated and the amount of indirect victimization they experienced in middle school and high school. We also collected information about reproductive opportunities such as age at first sexual intercourse and number of lifetime sex partners to determine whether aggression or victimization could be used to predict measures of reproductive opportunity. We performed a principal components analysis to develop factors from 16 aggression and victimization variables. Results indicate that females who reported indirect aggression toward peers had earlier ages at first sexual intercourse and females who were more victimized in adolescence experienced later ages at first sexual intercourse. We discuss these results in terms of intrasexual competition and evolutionary theory.     

Seeking social connectedness: interdependent self-construal and impression formation using photographic cues of social connectedness

Impression formation research has traditionally focused on either the characteristics of the target or of the participant, failing to examine their interplay. In the present study, we explored the role of interdependent self-construal on ratings of others who are portrayed as alone or connected. We hypothesized that participants with an interdependent view of the self would prefer others who are portrayed as socially connected, while the opposite would be true for participants low on interdependence. Results showed that college students high on interdependence rated a university professor photographed with another person relatively more positively than a professor photographed alone. This pattern was reversed for participants low on interdependence.     

Exploring the effects of similarity on mapping spatial relations

Solving a map task requires transferring information acquired in one spatial context to another context, an ability that marks an important step in cognitive development. This study investigated how preschoolers’ mapping performance was affected by the extent of similarity between spaces. Whereas prior work examined effects of similarity in tasks involving matching individual objects, our tasks required considering spatial relations among objects. We found that the accuracy of mapping between two spaces with somewhat different perceptual features was higher than the accuracy of mapping between spaces with identical features. Yet, a further increase in differences between the two spaces had a detrimental effect on mapping. The results suggest that some degree of similarity between spaces is beneficial to children’s ability to transfer relational information. However, when the spaces have the same surface features, it may draw children’s attention to individual objects and inhibit their ability to focus on common relations across contexts.