Dichotomous perception of animal categories in infancy

ABSTRACT

Although there is a wealth of knowledge on categorization early in life, there are still many unanswered questions about the nature of category representation in infancy. For example, it is unclear whether infants are sensitive to boundaries between complex categories, such as types of animals, or whether young infants exhibit such sensitivity without explicit experience in the lab. Using a morphing technique, we linearly altered the category composition of images and measured 6.5-month-olds’ attention to pairs of animal faces that either did or did not cross the categorical boundary, with the stimuli in each pair being equally dissimilar from one another across the two types of image pairs. Results indicated that infants dichotomize the continua between cats and dogs and between cows and otters, but only when the images are presented in their canonical, upright orientations. These findings demonstrate a propensity to dichotomize early in life that could have implications for social categorizations, such as race and gender.     

Men's grooming in the Latter-day Saints Church: A qualitative study of norm violation

The role of personal grooming as an indicator of commitment to church hierarchy is examined in a study of one congregation of the Church of Jesus Christ of Latter-day Saints. Latter-day Saints Church policy urges men to be clean-shaven. In the present study, we interview all men in one ward who have worn beards or mustaches, in order to investigate questions of authority, identity, and conflict that occurred as a result of violating the grooming norm. Interviewees describe an identity conflict, with self-expression conflicting with the desire to demonstrate faithfulness to their church. In some cases, they reconcile the conflict by conforming to the norm; in others, they violate the norm out of a sense of asserting their own identity, but this comes at a cost of distance from their church identity.     

Effects of Age,Domain, and Processing Demands on Memory Span: Evidence for Differential Decline

Analysis of cross-sectional data from the normative sample of the Wechsler Memory Scale - Third Edition (WMS-III) revealed different patterns of age-related differences in memory span measures depending on the type of memory item, processing demands, and the age of the older adult group. Regression of memory span on age revealed that the slope for Spatial Span raw scores was significantly more negative than the slope for Digit Span raw scores. There was no significant difference, however, either between the slopes for forward and backward Digit Span or between the slopes for forward and backward Spatial Span. Regression of Letter-Number Sequencing raw scores on age showed a distinctive, curvilinear pattern. Taken together, the present findings suggest that at least two mechanisms are involved in age-related differences in memory span. One mechanism, associated with a relatively linear decrease in memory span as a function of age, may differentially affect the storage of different types of information (e.g., sequences of digits vs. spatial locations). The other mechanism, evidenced by the curvilinear trend in Letter-Number Sequencing scores, may be tentatively attributed to a decline in executive aspects of working memory that becomes increasingly pronounced with age.     

Quantifying the Value of Emotions Using a Willingness to Pay Approach

People generally seek out positive moods and avoid negative moods; however, it is unclear which motivation is more pronounced. Two studies addressed this issue by developing a value-based ranking of emotions based on the willingness to pay (WTP) approach. The approach utilizes money’s cardinal properties and assumes opportunity costs as with everyday purchases. In Study 1 British participants indicated they would be willing to pay more to experience positive than to avoid negative emotions. In Study 2 this positivity bias was replicated with another sample of British participants. However, Hong Kong Chinese participants did not show such a preference, and were willing to pay significantly less to experience positive emotions but more to avoid negative emotions when compared with British participants. Experiencing Love was given the highest WTP judgment in all samples. Thus, some emotions are universally valued, whereas preferences for others differ across cultural groups, perhaps shaped by norms. Implications concerning valuations of psychological states for policy purposes are discussed.     

Communicative intentions in wild chimpanzees: persistence and elaboration in gestural signalling

We examine evidence for communicative intent during conspecific interactions in wild chimpanzees (Budongo Forest, Uganda), focusing on persistence in gestural communication. Previous research indicates that great apes have large gestural repertoires and produce gestural communication in a flexible and intentional manner, including the production of gesture sequences. Although there is a lack of consensus on the form and function of sequences, there is some evidence that sequences are produced when signallers fail to receive any response from a recipient. Here, we provide first systematic evidence for communicative persistence in wild chimpanzees. Rather than examining only the presence or absence of a response, we used the most commonly observed response to assign meanings to gestures and examined sequence production in relation to response congruency. Chimpanzees ceased communication if successful, but persevered when unsuccessful. Chimpanzees repeated gestures when a response partially matched their goal but substituted the original gesture when a response was incongruent. Persistence was also mediated by recipient intent to respond, with more sequences produced within competitive than affiliative contexts. Gestures within sequences were homogenous in semantic meaning and signallers continued until the response matched the assigned meaning of the initial gesture. Gestural sequence production was not primarily affective; gesture intensity (in terms of modality) did not increase within sequences. Chimpanzee gestural sequences emerged to achieve specific outcomes; given variability in recipient behaviour following initial gestures, signallers were flexible in their persistence towards these goals.     

Causal powers and preventers: An explanatory account of cue interaction effects in human causal judgement

According to the causal powers theory, all causal relations are understood in terms of causal powers of one thing producing an effect by acting on liability of another thing. Powers can vary in strength, and their operation also depends on the presence of preventers. When an effect occurs, there is a need to account for the occurrence by assigning sufficient strength to produce it to its possible causes. Contingency information is used to estimate strengths of powers and preventers and the extent to which they account for occurrences and nonoccurrences of the outcome. People make causal judgements from contingency information by processes of inference that interpret evidence in terms of this fundamental understanding. From this account it is possible to derive a computational model based on a common set of principles that involve estimating strengths, using these estimates to interpret ambiguous information, and integrating the resultant evidence in a weighted averaging model. It is shown that the model predicts cue interaction effects in human causal judgement, including forward and backward blocking, second and third order backward blocking, forward and backward conditioned inhibition, recovery from overshadowing, superlearning, and backward superlearning.     

Linguistic and nonlinguistic influences on the eyes' landing positions during reading

Two eye tracking experiments show that, for near launch sites, the eyes land nearer to the beginning of words with orthographically irregular than with regular initial letter sequences. In addition, the characteristics of words, at least at the level of orthography, influence the direction and length of within-word saccades. Importantly, these effects hold both for lower case and for visually less distinctive upper case text. Furthermore, contrary to previous evidence (Tinker & Paterson, 1939), there is little effect of type case on reading times. Additional analyses of oculomotor behaviour suggest that there is an inverted optimal viewing position for single fixation durations on words. Both the supplementary analyses and the effects of orthography on fixation positions are relevant to current models of eye movements in reading.     

Quality of Reasons and Degrees of Responsibility

Traditionally, theories of moral responsibility feature only the minimally sufficient conditions for moral responsibility. While these theories are well-suited to account for the threshold of responsibility, it’s less clear how they can address questions about the degree to which agents are responsible. One feature that intuitively affects the degree to which agents are morally responsible is how difficult performing a given action is for them. Recently, philosophers have begun to develop accounts of scalar moral responsibility that make use of this notion of difficulty [Coates and Swenson 2013; Nelkin 2016]. In this paper, I argue that these accounts, although innovative, are incomplete. The degree to which agents are morally responsible is determined not only by the difficulties that agents face but also by the quality of the reasons for which they act.     

Characteristics of Individuals Seeking Treatment for Obsessive-Compulsive Disorder

Despite severe functional impairment, only 35% to 40% of individuals with obsessive-compulsive disorder (OCD) seek treatment, and fewer than 10% receive evidence-based treatment. The current study examined the characteristics of 525 individuals who contacted the clinic of the Center for the Treatment and Study of Anxiety at the University of Pennsylvania to inquire about OCD treatment and completed a phone screen. Callers who were deemed appropriate for the clinic (n = 396, 75%) were invited to participate in an in-person intake evaluation. Only 137 (35%) of the eligible individuals completed the intake evaluation (“treatment intake group”) whereas the majority (n = 259, 65%) did not (“phone screen–only group”). Compared to individuals in the phone screen–only group, those in the treatment intake group were younger, less likely to endorse depressed mood, and more likely to have received a diagnosis of OCD, to have previously sought psychological services, and to have taken psychotropic medication. The findings suggest that familiarity with their diagnosis and past contact with mental health professionals enhance openness to explore yet another treatment. In contrast, lack of awareness about the problem and depressed mood may reduce openness to seek treatment.