The costs of doing two things at once for young and older adults: talking while walking,finger tapping,and ignoring speech or noise

Young and older adults provided language samples in response to questions while walking, finger tapping, and ignoring speech or noise. The language samples were scored on 3 dimensions: fluency, complexity, and content. The hypothesis that working memory limitations affect speech production by older adults was tested by comparing baseline samples with those produced while the participants were performing the concurrent tasks. There were baseline differences: Older adults' speech was less fluent and less complex than young adults' speech. Young adults adopted a different strategy in response to the dual-task demands than older adults: They reduced sentence length and grammatical complexity. In contrast, older adults shifted to a reduced speech rate in the dual-task conditions.     

Song copying by humpback whales: themes and variations

Male humpback whales (Megaptera novaeangliae) produce long, structured sequences of sound underwater, commonly called songs. Humpbacks progressively modify their songs over time in ways that suggest that individuals are copying song elements that they hear being used by other singers. Little is known about the factors that determine how whales learn from their auditory experiences. Song learning in birds is better understood and appears to be constrained by stable core attributes such as species-specific sound repertoires and song syntax. To clarify whether similar constraints exist for song learning by humpbacks, we analyzed changes over 14 years in the sounds used by humpback whales singing in Hawaiian waters. We found that although the properties of individual sounds within songs are quite variable over time, the overall distribution of certain acoustic features within the repertoire appears to be stable. In particular, our findings suggest that species-specific constraints on temporal features of song sounds determine song form, whereas spectral variability allows whales to flexibly adapt song elements.Electronic Supplementary Material Supplementary material is available for this article at .     

Reconciling nuclear risk: the impact of the Fukushima accident on comparative preferences for nuclear power in U.K. electricity generation

Polls conducted in the United Kingdom following the Fukushima nuclear accident (March 2011) indicated a fairly muted and temporary shift in public approval of nuclear power. This study investigated how: (a) comparative preferences for nuclear power in the United Kingdom might have been affected by the accident; and (b) how “supporters” of nuclear power reconciled their pro‐nuclear attitude in the wake of the disaster. Between‐subjects comparisons with a pre‐Fukushima sample revealed our post‐Fukushima sample to have comparable preferences for nuclear power. Further analysis suggested that “supporters” retained their pro‐nuclear stance in response to Fukushima by emphasizing the necessity of nuclear power in the U.K. context. The theoretical, practical and methodological implications for these findings are discussed.     

The Scientific Self: Reclaiming Its Place in the History of Research Ethics

How can the history of research ethics be expanded beyond the standard narrative of codification—a story that does not reach back beyond World War II—without becoming so broad as to lose all distinctiveness? This article proposes a history of research ethics focused on the “scientific self,” that is, the role-specific identity of scientists as typically described in terms of skills, competencies, qualities, or dispositions. Drawing on three agenda-setting texts from nineteenth-century history, biology, and sociology, the article argues that the “revolutions” these books sought to unleash were, among other things, revolts against inherited conceptions of scientific selfhood. They tried to redefine the scientific self in their respective fields of inquiry by advocating particular catalogs of virtues or character traits. These ideals of selfhood, their contested nature notwithstanding, translated into practice in so far as they influenced hiring and selection policies and found their way into educational systems. The project of reclaiming the scientific self as an important subject of study in the history of research ethics is not an antiquarian pursuit, but related to an ethical question faced by scientists today: How are their scientific selves being shaped by funding schemes, research evaluation protocols, and academic hiring policies?     

Aging and the vulnerability of speech to dual task demands

Tracking a digital pursuit rotor task was used to measure dual task costs of language production by young and older adults. Tracking performance by both groups was affected by dual task demands: time on target declined and tracking error increased as dual task demands increased from the baseline condition to a moderately demanding dual task condition to a more demanding dual task condition. When dual task demands were moderate, older adults' speech rate declined but their fluency, grammatical complexity, and content were unaffected. When the dual task was more demanding, older adults' speech, like young adults' speech, became highly fragmented, ungrammatical, and incoherent. Vocabulary, working memory, processing speed, and inhibition affected vulnerability to dual task costs: vocabulary provided some protection for sentence length and grammaticality, working memory conferred some protection for grammatical complexity, and processing speed provided some protection for speech rate, propositional density, coherence, and lexical diversity. Further, vocabulary and working memory capacity provided more protection for older adults than for young adults although the protective effect of processing speed was somewhat reduced for older adults as compared to the young adults.     

Recruitment Strategies for a Home-Based Physical Activity Intervention for Breast Cancer Patients

Recruiting cancer patients for randomized trials investigating psychosocial interventions presents several unique challenges. This paper describes the challenges and yields for different recruitment methods used in Moving Forward, a randomized trial of a home-based moderate-intensity physical activity program for early-stage breast cancer survivors. Recruitment methods included letters sent to patients by their oncologists, direct referrals from oncologists, in-person recruitment in oncology clinics, referrals from nurses and medical assistants, passive recruitment, other mailings, and community outreach strategies. Of the 424 screenings completed, 86 (20.3%) participants were randomized. Physician letters yielded the greatest number of initial screenings (147; 34.7%) and participants randomized (28; 32.5%). In-person recruitment also proved to be a productive recruitment strategy; 14 (16.3%) of the participants were recruited via this strategy. Community outreach efforts did not provide as great a yield and were labor intensive. We discuss suggestions for recruitment of cancer patients in future trials.