What’s the object of object working memory in infancy? Unraveling ‘what’ and ‘how many’

Infants have a bandwidth-limited object working memory (WM) that can both individuate and identify objects in a scene, (answering ‘how many?’ or ‘what?’, respectively). Studies of infants’ WM for objects have typically looked for limits on either ‘how many’ or ‘what’, yielding different estimates of infant capacity. Infants can keep track of about three individuals (regardless of identity), but appear to be much more limited in the number of specific identities they can recall. Why are the limits on ‘how many’ and ‘what’ different? Are the limits entirely separate, do they interact, or are they simply two different aspects of the same underlying limit?We sought to unravel these limits in a series of experiments which tested 9- and 12-month-olds’ WM for object identities under varying degrees of difficulty. In a violation-of-expectation looking-time task, we hid objects one at a time behind separate screens, and then probed infants’ WM for the shape identity of the penultimate object in the sequence. We manipulated the difficulty of the task by varying both the number of objects in hiding locations and the number of means by which infants could detect a shape change to the probed object. We found that 9-month-olds’ WM for identities was limited by the number of hiding locations: when the probed object was one of two objects hidden (one in each of two locations), 9-month-olds succeeded, and they did so even though they were given only one means to detect the change. However, when the probed object was one of three objects hidden (one in each of three locations), they failed, even when they were given two means to detect the shape change. Twelve-month-olds, by contrast, succeeded at the most difficult task level.Results show that WM for ‘how many’ and for ‘what’ are not entirely separate. Individuated objects are tracked relatively cheaply. Maintaining bindings between indexed objects and identifying featural information incurs a greater attentional/memory cost. This cost reduces with development. We conclude that infant WM supports a small number of featureless object representations that index the current locations of objects. These can have featural information bound to them, but only at substantial cost.     

‘Core Knowledges’: a dissociation between spatiotemporal knowledge and contact‐mechanics in a non‐human primate?

Human toddlers demonstrate striking failures when searching for hidden objects that interact with other objects, yet successfully locate hidden objects that do not undergo mechanical interactions. This pattern hints at a developmental dissociation between contact-mechanical and spatiotemporal knowledge. Recent studies suggest that adult non-human primates may exhibit a similar dissociation. Here, I provide the first direct test of this dissociation using a search paradigm with adult rhesus monkeys. Subjects watched as a plum rolled behind one of two opaque barriers. In Experiment 1, subjects had to locate the plum based on the position of a wall that blocked the plum's trajectory. Subjects searched incorrectly, apparently neglecting information about the location of the wall. However, subjects searched correctly in Experiments 2-4 when they were given spatiotemporal information about the plum's movement. Results indicate that adult monkeys use spatiotemporal information, but not contact-mechanical information, to locate hidden objects. This dissociation between contact-mechanical and spatiotemporal knowledge is discussed in light of developmental theories of core knowledge and the literature on object-based attention in human adults.     

Do maternal stress and home environment mediate the relation between early income‐to‐need and 54‐months attentional abilities?

Using Ecological Systems Theory and stage sequential modelling procedures for detecting mediation, this study examined how early developmental contexts impact preschoolers' performances on a measure of sustained attention and impulse control. Data from 1273 European‐American and African‐American participants in the NICHD Study of Early Child Care were used to identify the potential mediators of the relation between early household income‐to‐need (INR) and 54‐month impulsivity and inattention. Exploratory analyses were also conducted to determine whether the relationships between early income, home environment, parenting stress, and the outcome variables differ for African‐American versus European‐American‐American children. We found modest support for the study hypothesis that 36‐month home environment quality mediated the INR/attention relationship. INR accounted for more home environment score variance and home environment accounted for more Impulsivity score variance for African‐American children. Home environments were related to inattention in the European‐American, but not African‐American, group. Copyright © 2007 John Wiley & Sons, Ltd.     

Interrupting infants’ persisting object representations: an object‐based limit?

Making sense of the visual world requires keeping track of objects as the same persisting individuals over time and occlusion. Here we implement a new paradigm using 10-month-old infants to explore the processes and representations that support this ability in two ways. First, we demonstrate that persisting object representations can be maintained over brief interruptions from additional independent events - just as a memory of a traffic scene may be maintained through a brief glance in the rearview mirror. Second, we demonstrate that this ability is nevertheless subject to an object-based limit: if an interrupting event involves enough objects (carefully controlling for overall salience), then it will impair the maintenance of other persisting object representations even though it is an independent event. These experiments demonstrate how object representations can be studied via their 'interruptibility', and the results are consistent with the idea that infants' persisting object representations are constructed and maintained by capacity-limited mid-level 'object-files'.     

Does culture shape face perception in autism? Cross‐cultural evidence of the own‐race advantage from the UK and Japan

Autism spectrum disorders (ASD) are associated with face perception atypicalities, and atypical experience with faces has been proposed as an underlying explanation. Studying the own‐race advantage (ORA) for face recognition can reveal the effect of experience on face perception in ASD, although the small number of studies in the area present mixed findings. This study probed the ORA in ASD by comparing two cultural groups simultaneously for the first time. Children with ASD in the UK (N = 16) and Japan (N = 26) were compared with age‐ and ability‐matched typically developing (TD) children in the UK (N = 16) and Japan (N = 26). Participants completed a two‐alternative forced‐choice task, whereby they had to recognize a just seen face from a foil which was manipulated in one of four ways (IC: identity change; EE: easy eyes; HE: hard eyes; HM: hard mouth). Face stimuli were Asian and Caucasian, and thus the same stimuli were own and other race depending on the cultural group. The ASD groups in the UK and Japan did not show impaired face recognition abilities, or impairments with recognizing faces depending on manipulations to the eye region, and importantly they showed an ORA. There was considerable heterogeneity in the presence of the ORA in ASD and TD and also across cultures. Children in Japan had higher accuracy than children in the UK, and TD children in Japan did not show an ORA. This cross‐cultural study challenges the view that atypical experiences with faces lead to a reduced/absent ORA in ASD.     

Danger and usefulness: An alternative framework for understanding rapid evaluation effects in perception?

Previous studies have shown effects of rated danger and usefulness on lexical access. All of them have used stimuli selected for connotations of danger and/or usefulness. Stimuli for the present lexical decision study were all of the nouns, verbs, and adjectives from the Balota et al. (2002) English Lexicon Project (subject to constraints relating to experimental control; none had anything to do with danger or usefulness). The interaction between danger and usefulness ratings previously demonstrated (Wurm & Vakoch, 2000; Wurm, Vakoch, Seaman, & Buchanan, 2004; Wurm, Whitman, Seaman, Hill, & Ulstad, 2007) was found for nouns, even when age of acquisition was controlled. It was also found for verbs and adjectives. The interaction is believed to reflect competing pressures to (1) avoid dangerous objects/events and (2) approach valuable resources. It may be a manifestation of the rapid evaluation effects pervasive in the literature. Post hoc analyses showed that danger and usefulness explain as much variance as valence and arousal, or evaluation, potency, and activity.     

Do humor styles matter in the relationship between personality and subjective well‐being?

The primary goal of this research was to examine the role of humor styles in the relationships between personality (extraversion and neuroticism) and two components of subjective well-being: life satisfaction and affective well-being. The sample consisted of 225 young adults, with mean age 23.61 years. Results indicated that the relationship between both extraversion and neuroticism and satisfaction with life could be partially explained by the mediating role of self-enhancing humor. Additionally, affiliative humor proved to be a partial mediator of the relationship between neuroticism and affective well-being. The findings of this research suggested that adaptive humor styles might be one of the mechanisms linking personality and subjective well-being.     

Cultural differences in self‐recognition: the early development of autonomous and related selves?

Fifteen‐ to 18‐month‐old infants from three nationalities were observed interacting with their mothers and during two self‐recognition tasks. Scottish interactions were characterized by distal contact, Zambian interactions by proximal contact, and Turkish interactions by a mixture of contact strategies. These culturally distinct experiences may scaffold different perspectives on self. In support, Scottish infants performed best in a task requiring recognition of the self in an individualistic context (mirror self‐recognition), whereas Zambian infants performed best in a task requiring recognition of the self in a less individualistic context (body‐as‐obstacle task). Turkish infants performed similarly to Zambian infants on the body‐as‐obstacle task, but outperformed Zambians on the mirror self‐recognition task. Verbal contact (a distal strategy) was positively related to mirror self‐recognition and negatively related to passing the body‐as‐obstacle task. Directive action and speech (proximal strategies) were negatively related to mirror self‐recognition. Self‐awareness performance was best predicted by cultural context; autonomous settings predicted success in mirror self‐recognition, and related settings predicted success in the body‐as‐obstacle task. These novel data substantiate the idea that cultural factors may play a role in the early expression of self‐awareness. More broadly, the results highlight the importance of moving beyond the mark test, and designing culturally sensitive tests of self‐awareness.     

How do 8‐month‐old infants recognize causality in object motion and that in human action?1

Abstract: In Experiment 1, 8‐month‐old infants were first habituated to the event in which a moving object collided with another behind an occluder, then they were shown the two test events with no occluder: the contact event, in which the two objects actually collided, and the non‐contact event, in which the second object started to move without contact with the first. The infants looked at both events for an equal amount of time. In Experiment 2, in which the first object was a human actor, however, infants looked at the non‐contact event reliably longer than the contact event. In Experiment 3, in which both objects were human actors stood face‐to‐back, infants looked at the non‐contact event longer, whereas in Experiment 4, in which human actors faced toward each other, infants looked at both events equally. In Experiment 5, in which the first actor told the second to go, 10‐month‐old infants looked at both events for an equal amount of time. These results suggest that 8‐ and 10‐month‐old infants appreciate different causal principles between objects and humans, and that, in doing this, they may acknowledge the possibility of communication between humans.     

Autism,early narcissistic injury and self‐organization: a role for the image of the mother’s eyes?

Holland elucidated the new paradigm of self-organization in complex adaptive systems. This paradigm holds for all living systems, including the personality. In conjunction with the theory of archetypes, self-organization suggests two radical hypotheses, one about early development, the other about the origins of autism. Autism is associated with several medical conditions, with genetic markers, and with infant visual deprivation. However none of these factors is either necessary or sufficient to cause autism. It is hypothesized that each of these factors increases the likelihood of a primary psychological deficit: failure to acquire, or retain, the image of the mother's eyes. This hypothesis was initially derived from analytic work with patients who have early narcissistic injury and with patients who have mild autistic traits. Both diagnoses may arise from the same initial disturbance: Symington argued that autism is an extreme form of infantile narcissism. Indirect evidence for the image-of-the-eyes hypotheses comes from the evolution of primates, from infant-mother observations, from observations of infant vision, and from experiments on vision in other vertebrates. Byrd recently confirmed that the incidence of autism is increasing dramatically. The image-of-the-eyes hypotheses suggest that this increase may be linked to increased use of non-maternal childcare for young infants.     

Will the young support the old? An individual‐ and family‐level study of filial obligations in two New Zealand cultures

Do people feel that they are obliged to look after older parents and grandparents, support them financially, respect, obey, and maintain contact with them, as well as please them and make them happy? Two surveys of filial obligations were conducted in New Zealand involving 100 Chinese and 103 European families respectively. Across the 587 individuals from two generations, a widely shared obligation hierarchy emerged with social contact and respect on top of all others. Chinese were higher than Europeans on obedience and financial support as predicted, but also on most other obligations. Gender differences, contrary to prediction, were generally absent; but children were significantly higher than their parents on obedience. Obligations were moderately intercorrelated, and also correlated with corresponding expectations. K‐means cluster analysis was used in a novel way to discover three European and four Chinese family obligation types. Further family‐level analysis showed that parental income, grandparents’ residence, and motivations in communicating with elders differentiated the family types.     

Does child verbal ability mediate the relationship between maternal sensitivity and later self‐regulation? A longitudinal study from infancy to 4 years

There is a need to further examine the mechanisms by which maternal sensitivity influences the development of child self‐regulation. This study investigated the role of maternal sensitivity when infants were 10 months old and child verbal ability at 18 months, in relation to various aspects of self‐regulation at 48 months, in a sample of 95 typically developing children (46.3% girls). In particular, the study examined, from a Vygotskian perspective, whether child verbal ability, as measured by receptive and expressive language, mediated the relationship between maternal sensitivity and hot and cool aspects of self‐regulation in the child. As hypothesized, maternal sensitivity predicted child verbal ability, as well as working memory, set shifting, and delay of gratification. Child receptive language predicted set shifting, inhibition, and delay of gratification. In addition, receptive language mediated the relationship between maternal sensitivity and inhibition only. Additive effects of maternal sensitivity and child receptive language in relation to set shifting were found, and a main effect of maternal sensitivity on child delay of gratification. The results add to the body of research suggesting that responsive parenting and child verbal ability are important for the development of self‐regulation, and suggest that different mechanisms may be at work for different aspects of self‐regulation.     

Action in perception? Empirical and philosophical arguments against the enactive approach to perception

This paper focuses on the epistemic conditions of visual perception, ie it concentrates on the question of what kind of knowledge is required for us in order to be able to see colours and shapes as spatial properties of things. According to contemporary theories of sensory perception that follow the tradition of George Berkeley, like Alva Noe's so-called enactive approach to perception, this type of visual perception requires a certain kind of implicit practical knowledge, namely implicit sensorimotor knowledge of the way sensory stimulation varies as the perceiver moves. Two objections are presented against this central claim of the enactive approach. First, empirical evidence from psychological research on children's cognitive and motor development suggests that visual content is entirely independent of sensorimotor knowledge. Second, the enactive approach gets involved in the characteristic problems of classical sense--datum theories by introducing the extremely problematic claim that the recognition of appearances is the epistemic starting point for the perception of things and their properties.     

What do infants see in faces? ERP evidence of different roles of eyes and mouth for face perception in 9‐month‐old infants

The study examined whether face‐specific perceptual brain mechanisms in 9‐month‐old infants are differentially sensitive to changes in individual facial features (eyes versus mouth) and whether sensitivity to such changes is related to infants' social and communicative skills. Infants viewed photographs of a smiling unfamiliar female face. On 30% of the trials, either the eyes or the mouth of that face were replaced by corresponding parts from a different female. Visual event‐related potentials were recorded to examine face‐sensitive brain responses. Results revealed that increased competence in expressive communication and interpersonal relationships was associated with a more mature response to faces, as reflected in a larger occipito‐temporal N290 with shorter latency. Both eye‐ and mouth changes were detected, though infants derived different information from these features. Eye changes had a greater impact on the face perception mechanisms and were not correlated with social or communication development, whereas mouth changes had a minimal impact on face processing but were associated with levels of language and communication understanding. Copyright © 2009 John Wiley & Sons, Ltd.     

An ‘Oedipus pattern’ in the Old Testament?

The Oedipus myth and a scapegoat pattern have been central issues in both Walter Burkert's and René Girard's writings about ancient Greek religion. This article proposes the existence of a comparable pattern in the Old Testament legend about the Ark (1-2 Samuel). Together with other Old Testament narratives (David, Moses) and other ancient Near Eastern legends and rituals, these instances form a transformational network, which shows some fundamental positions in a trans-cultural scapegoat-pattern of actantial positions: king, hero, villain and scapegoat.     

Is multiple object tracking carried out automatically by an early vision mechanism independent of higher‐order cognition? An individual difference approach

Existing theories of multiple object tracking (MOT) offer different predictions concerning the role of higher level cognitive processes, individual differences, effortful attention and parallel processing in MOT. Pylyshyn's model (1989) argues for an automatic parallel processing mechanism separate from other cognition, whereas alternative models (e.g., Kahneman & Treisman, 1984 or spotlight models) are based on higher level cognition such as spatial short‐term memory and/or effortful attention switching. These predictions were examined in Experiment 1 where identical objects and in Experiment 2 where visually and semantically distinct objects were tracked. Both experiments demonstrated a substantial individual variation in the estimated tracking capacity. Tasks measuring visuospatial short‐term memory and attention switching proved to be significant predictors of MOT. In addition, tracking performance deteriorated as a function of tracking time and set size. Our results are in contrast to Pylyshyn's model. A mechanism with both parallel and serial processing and temporary spatial memory is outlined to accommodate the observed pattern of results.