Evidence of rapid recovery from perceptual odor adaptation using a new stimulus paradigm

By attenuating neural and perceptual responses to sustained stimulation, adaptation enhances the detection of new, transient stimuli. Disadaptation serves a similarly important role as a temporal filter for chemoreceptor cells, producing rapid recovery of sensitivity upon termination of the adapting odorant. Previous research from our laboratory indicated that a rapid form of odor adaptation can be measured using a novel, simultaneous-odorant paradigm. In the present study, we extended the earlier method by measuring recovery from adaptation. Perceptual odor adaptation was measured by estimating psychophysical detection thresholds in a group of college-aged student volunteers (N = 20; 12 females, eight males) for a self-adapting odorant, vanilla extract. To induce adaptation, the time between the onset of the adapting odorant and the onset of the target odorant was systematically varied. By first quantifying adaptation, recovery of sensitivity could therefore be investigated by using different time points following the termination of the adapting odorant. Consistent with our previous work, thresholds estimated in the presence of the simultaneous adapting odorant were significantly increased, reflecting a decrease in sensitivity due to adaptation. Conversely, approximately 100 ms following termination of the adapting stimulus (the briefest delay tested), sensitivity began to rapidly recover. Nevertheless, some residual adaptation was evident at the longest offset delay of 500 ms. These findings suggest that the recovery from adaptation proceeds at least as rapidly as the onset of adaptation, a finding that is consistent with physiological evidence from olfactory receptors. These data also suggest the effectiveness of this new odorant paradigm in characterizing the temporal characteristics underlying these critical olfactory mechanisms.     

Subject‐Involving Luck

In recent years, philosophers have tended to think of luck as being a relation between an event (taken in the broadest sense of the term) and a subject; to give an account of luck is to fill in the right‐hand side of the following biconditional: an event e is lucky for a subject S if and only if ____. We can call such accounts of luck subject‐relative accounts of luck, since they attempt to spell out what it is for an event to be lucky relative to a subject. This essay argues that we should understand subject‐relative luck as a secondary phenomenon. What is of philosophical interest is giving an account of subject‐involving luck, i.e., filling in the right‐hand side of this biconditional: it is a matter of luck that S ?s iff ____. The essay argues that one of the upshots of focusing on subject‐involving luck is that lack of control accounts of luck (LCALs) become more attractive. In particular, a range of counterexamples to LCALs of subject‐relative luck do not apply to LCALs of subject‐involving luck.     

Informing Children of Their Newborn Screening Carrier Result for Sickle Cell or Cystic Fibrosis: Qualitative Study of Parents’ Intentions,Views and Support Needs

Newborn screening for cystic fibrosis and sickle cell disease enables the early identification and treatment of affected children, prolonging and enhancing their quality of life. Screening, however, also identifies carriers. There are minimal or no health concerns for carriers. There are, however, potential implications when carriers reach reproductive age, and thus research attention has been given to how best to convey information about these implications in a meaningful, balanced way which does not raise undue anxieties. Most research focuses on the communication from health professional to parent, yet ultimately this information is of greatest significance to the child. This study examines parents’ intentions to inform their child of newborn screening carrier results. Semi-structured interviews with 67 family members explored their intentions to inform the child, and related views and support needs. Parents almost unanimously indicated they planned to inform the child themselves. Health professionals were expected, however, to provide guidance on this process either to parents through advice and provision of written materials, or directly to the child. Although parents initially stated that they would convey the result once their child had developed the ability to understand the information, many appeared to focus on discrete life events linked to informed reproductive decision making. The results highlight ways in which health care providers may assist parents, including providing written material suitable for intergenerational communication and ensuring that cascade screening is accessible for those seeking it. Priorities for further research are identified in light of the results.     

Will They or Won’t They? Secret Telling in Interpersonal Interactions

This study investigated predictors of within-gender secret telling. Eighty-eight participants were exposed to either a “positive” or a “negative” secret about another individual. Just under 20% of participants told the secret. Conscientiousness, secret condition, empathy, and the conscientiousness by secret condition interaction had effects on the rate of secret telling, χ² (5,82) = 17.78, p = .003, AIC = 80.60. Conscientiousness had a negative effect on secret telling among participants that told the “negative” secret.     

Critical Notice: Paul Russell's The Riddle of Hume's Treatise: Skepticism,Naturalism, and Irreligion (OUP 2008)

In The Riddle of Hume's Treatise: Skepticism, Naturalism, and Irreligion (2008), Paul Russell makes a strong case for the claim that “The primary aim of Hume's series of skeptical arguments, as developed and distributed throughout the Treatise, is to discredit the doctrines and dogmas of Christian philosophy and theology with a view toward redirecting our philosophical investigations to areas of ‘common life,’ with the particular aim of advancing ‘the science of man’” (2008, 290). Understanding Hume in this way, according to Russell, sheds light on the “ultimate riddle” of the Treatise: “is it possible to reconcile Hume's (extreme) skeptical principles and conclusions with his aim to advance the ‘science of man’” (2008, 3)? Or does Hume's skepticism undermine his “secular, scientific account of the foundations of moral life in human nature” (290)? Russell's controversial thesis is that “the irreligious nature of Hume's fundamental intentions in the Treatise” is essential to solving the riddle (11). Russell makes a compelling case for Hume's irreligion as well as his atheism. Contrary to this interpretation I argue that Hume is an irreligious theist and not an atheist.     

Effect of Platform Used for Data Collection on Open-Ended Response Quality

Although the validity of collecting quantitative data using electronic platforms has been widely accepted, there has been concern that qualitative data collected on an electronic platform may not provide the same depth and richness in response quality as data collected using the pen-and-paper format. This article compares the quality of responses to open-ended questions collected using the pen-and-paper platform with responses collected using an electronic platform. Data for a program evaluation study were collected using either the pen-and-paper platform, an iPad, or an iPad Mini at a series of after-hours events for adults at the Center of Science and Industry, a Midwest science center. Metrics were designed to calculate a comprehensive response score consisting of the breadth of information and the richness of detail in open-ended item responses, allowing us to compare the overall response quality between the three platforms. Results indicate that qualitative data collected using electronic devices are as broad and detailed as data collected using traditional pen-and-paper techniques.     

A duration model analysis of consumer preferences and determinants of video game consumption

Despite the enormous revenues generated by the video game industry in recent years, relatively little research has been undertaken into consumer preferences and the determinants of video game consumption. This study addresses this deficiency through the analysis of data from a popular online video game that includes historic behavioural information for 1,408 consumers participating in 728,811 unique rounds of gameplay. We analyse these data with the goal of estimating determinants of the aggregate amount of time that a consumer spends playing the game. Through the estimation of duration models, we show that less experienced consumers are less likely to continue playing the game at any given point, possibly due to having achieved mastery and becoming bored. However, we also find that consumers tend to play the game for longer periods when using a wider range of character roles and vehicles, implying that a consumer's interest can be maintained through exposure to greater variety. Our results represent the first such evidence on in‐game consumer preferences, which has important implications for video game consumption through optimisation of gameplay experiences to satisfy these preferences.     

Biosocial selfhood: overcoming the ‘body-social problem’ within the individuation of the human self

In a recent paper, Kyselo (2014) argues that an enactive approach to selfhood can overcome ‘the body-social problem’: “the question for philosophy of cognitive science about how bodily and social aspects figure in the individuation of the human individual self” (Kyselo 2014, p. 4; see also Kyselo and Di Paolo (2013)). Kyselo’s claim is that we should conceive of the human self as a socially enacted phenomenon that is bodily mediated. Whilst there is much to be praised about this claim, I will demonstrate in this paper that such a conception of self ultimately leads to a strained interpretation of how bodily and social processes are related. To this end, I will begin the paper by elucidating the body-social problem as it appears in modern cognitive science and then expounding Kyselo’s solution, which relies on a novel interpretation of Jonas’s (1966/2001) concept of needful freedom. In response to this solution, I will highlight two problems which Kyselo’s account cannot overcome in its current state. I will argue that a more satisfactory solution to the body-social problem involves a re-conception of the human body as irrevocably socially constituted and the human social world as irrevocably bodily constituted. On this view, even the most minimal sense of selfhood cannot privilege either bodily or social processes; instead, the two are ontologically entwined such that humans are biosocial selves.     

Non-organizational Religious Participation,Subjective Religiosity,and Spirituality among Older African Americans and Black Caribbeans

This study utilizes data from the National Survey of American Life to examine the sociodemographic and denominational correlates of religious involvement and spirituality among older African Americans and Black Caribbeans. Eleven measures of non-organizational religious participation, subjective religiosity, and spirituality are utilized. The findings indicate significant gender, income, region, marital status, denominational, and immigration status differences in religiosity and spirituality. Among older Black Caribbeans, income was a consistent correlate of religious participation and spirituality. The findings are discussed in relation to prior work in the area of religious involvement among older adults.