Understanding of and reasoning about object–object relationships in long-tailed macaques?

Diagnostic reasoning, defined as the ability to infer unobserved causes based on the observation of their effects, is a central cognitive competency of humans. Yet, little is known about diagnostic reasoning in non-human primates, and what we know is largely restricted to the Great Apes. To track the evolutionary history of these skills within primates, we investigated long-tailed macaques’ understanding of the significance of inclinations of covers of hidden food as diagnostic indicators for the presence of an object located underneath. Subjects were confronted with choices between different objects that might cover food items. Based on their physical characteristics, the shape and orientation of the covers did or did not reveal the location of a hidden reward. For instance, hiding the reward under a solid board led to its inclination, whereas a hollow cup remained unaltered. Thus, the type of cover and the occurrence or absence of a change in their appearance could potentially be used to reason diagnostically about the location of the reward. In several experiments, the macaques were confronted with a varying number of covers and their performance was dependent on the level of complexity and on the type of change of the covers’ orientation. The macaques could use a board’s inclination to detect the reward, but failed to do so if the lack of inclination was indicative of an alternative hiding place. We suggest that the monkeys’ performance is based on a rudimentary understanding of causality, but find no good evidence for sophisticated diagnostic reasoning in this particular domain.     

Object features, object locations, and object files: which does selective attention activate and when?

The representation within which attention operates was investigated in 3 experiments. The task was similar to that of R. Egly, J. Driver, and R. D. Rafal (1994). Participants had to detect the presence of a target at 1 of 4 ends of 2 shapes, differing in color and form. A precue appeared at 1 of the 4 possible corners. The 2 shapes occupied either the same or different locations in the cuing and target displays. The results showed that the cued object location was attended whether or not space was task relevant, whereas the cued object features (color and form) were attended only when these were task relevant. Moreover, when object file continuity was maintained through continuous movement, attention was found to follow the cued object file as it moved while also accruing to the cued location.     

Effects of acute stress and GluN2B-containing NMDA receptor antagonism on object and object–place recognition memory

The mechanisms underlying the complex effects of acute stress on memory are incompletely understood. Previous work suggests that the activation of N-methyl-d-aspartate (NMDA) receptors specifically containing GluN2B subunits may underlie the disruptions in spatial memory retrieval caused by acute stress (Wong et al., 2007 PNAS 104:11471). The present experiments were designed to assess whether a similar mechanism is involved in recognition memory. Recognition memory retrieval was assessed in Sprague–Dawley rats using an object recognition test and an object–place recognition test, both of which rely on patterns of spontaneous exploration. Exposure to acute stress for 30 min immediately before the test phase of either test disrupted memory retrieval. Administration of the GluN2B-selective antagonist Ro25-6981 (6 mg/kg; i.p.) enhanced memory in the object recognition test regardless of whether animals were exposed to acute stress. In the object–place test, Ro25-6981 had no effect on memory retrieval in the absence of stress but promoted memory following acute stress. These data highlight the specific contributions made by GluN2B-containing NMDA receptors to recognition memory for different types of stimuli.     

Mother—infant interaction structures and presymbolic self‐ and object representations

Using research on the purely social face‐to‐face exchange, we examine patterns of mother—infant interaction and their relevance for the presymbolic origins of self and object representations, focusing on the representation of inter‐relatedness between self and object. Based on a dyadic systems view in which the system is defined by both self‐ and interactive‐regulation processes, we argue that characteristic patterns of self and interactive regulation form early interaction structures, which provide an important basis for emerging self and object representations. What will be represented, presymbolically, is the dynamic interactive process itself, the interplay, as each partner influences the other from moment to moment. This is a dynamic, process view of “interactive”; or “dyadic”; representations. The argument that early interaction structures organize experience is based on a transformational model in which there are continuous transformations and restructurings, where development is in a constant state of active reorganization. To define the capacities on which a presymbolic representational capacity is based, we review the last decade's research on infant perception and memory, which has radically changed our concepts of representation. The interaction structures we describe illustrate the salience of arousal, affect, space, and time in the early organization of experience: (1) state transforming, the expectation that an arousal state can be transformed through the contribution of the partner; (2) facial mirroring, the expectation of matching and being matched in the direction of affective change; (3) disruption and repair, the expectation of degree of ease and rapidity of interactive repair following facial‐visual mismatches; (4) “chase and dodge,”; the expectation of the misregulation and derailment of spatial‐orientation patterns, without repair; and (5) interpersonal timing, the expectation of degree of vocal rhythm matching.     

Categorization and action: What about object consistence?

Categorization studies have focused on the importance of a variety of perceptual properties (shape, size, weight). The present study explored whether the softness or hardness of an object might influence the way we categorize and consider category members. Of additional interest was whether information on consistence is automatically activated and whether it is modulated by the kind of task and of response modality. Three experiments demonstrated that information on consistence is automatically activated, and it helps us to distinguish between artefacts and natural objects. Interestingly, the results are in agreement with the simulation hypothesis; namely, when we consider artefacts, we simulate using them and information on their consistence is activated; this simulation is modulated by the task. The way we differently process artefacts and natural objects across the experiments confirms the simulation hypothesis and our sensitivity to the response modality.     

The present and absent object—on thinking and the capacity to symbolize

In this paper, Bion's different theories on the development of thinking will be introduced: on the one hand, his theory of thoughts as resulting from tolerance for the absence of the object, and on the other hand, dream thoughts and thoughts as resulting from the presence of the object, originally through the mother's containing function. The effects of failures in this development will be discussed; among other things, a hypertrophy of the apparatus of projective identification at the expense of thinking capacities. Briefly, a comparison will be made between a facilitating relation between container and contained and the oscillation between the paranoid-schizoid and depressive position, which Bion describes as a prerequisite for open symbolizing processes. Bion's theories and concepts will be supplemented by Winnicott's theories on the “creative illusion” and the breast/the mother as a “subjective object” as a precondition for the symbolizing capacity that later develops in the “potential space”. Very briefly, a comparison is made between Winnicott's term “the subjective object” and Segal's term “symbolic equation”. Clinical vignettes are interpolated.     

Changing within-trial array location and target object position enhances rats’ (Rattus norvegicus) missing object recognition accuracy

Six rats were trained to find a previously missing target or 'jackpot' object in a square array of four identical or different objects (the test segment of a trial) after first visiting and collecting sunflower seeds from under the other three objects (the study segment of a trial). During training, objects' local positions within the array and their global positions within the larger foraging array were varied over trials but were not changed between segments within a trial. Following this training, rats were tested on their accuracy for finding the target object when a trial's test array was sometimes moved to a different location in the foraging arena or when the position of the target object within the test array had been changed. Either of these manipulations initially slightly reduced rats' accuracy for finding the missing object but then enhanced it. Relocating test arrays of identical objects enhanced rats' performance only after 10-min inter-segment intervals (ISIs). Relocating test arrays of different objects enhanced rats' performance only after 2-min ISIs. Rats also improved their performance when they encountered the target object in a new position in test arrays of different objects. This enhancement effect occurred after either 2- or 30-min ISIs. These findings suggest that rats separately retrieved a missing (target) object's spatial and non-spatial information when they were relevant but not when they were irrelevant in a trial. The enhancement effects provide evidence for rats' limited retrieval capacity in their visuo-spatial working memory.     

Do top and bottom contribute to object perception more than left and right?

To examine whether the top–bottom axis has an inherent advantage in object perception over the left–right one, three experiments were conducted. In all of them, on each trial one of two alternative stimuli, identical in shape but opposite in direction (viz, related by reflection), was presented. Both reflection about the vertical axis and reflection about the horizontal axis were applied, in different blocks. In Experiment 1, objects with an orientation-free definition (arrows, incomplete squares) were presented. Subjects were to respond when the stimulus pointed in a specific direction, and to refrain from responding when it was reflected, namely pointed in the opposite direction. Axis of reflection (vertical, horizontal) was varied between blocks. In Experiment 2, the object was a Hebrew character asymmetric on both axes, presented either in its normal appearance or reflected. Subjects were to respond only when the stimulus was normal. Both axis of reflection (vertical, horizontal) and orientation angle (upright, tilted by 90°) were varied between blocks. In Experiment 3, stimuli were the same as in Experiment 2, but the task explicitly asked for a binary reflection judgment (normal vs. reflected). No sign for the presence of an axis effect was observed in any of those experiments, which seems incompatible with the hypothesis of vertical advantage in object perception. It is suggested that most vertical advantage observed before is due to extra-perceptual processing.

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Imageability and body–object interaction ratings for 599 multisyllabic nouns

We collected imageability and body–object interaction (BOI) ratings for 599 multisyllabic nouns. We then examined the effects of these variables on a subset of these items in picture-naming, word-naming, lexical decision, and semantic categorization. Picture-naming latencies were taken from the International Picture-Naming Project database (Szekely, Jacobsen, D’Amico, Devescovi, Andonova, Herron, et al. Journal of Memory and Language, 51, 247–250, 2004), word-naming and lexical decision latencies were taken from the English Lexicon Project database (Balota, Yap, Cortese, Hutchison, Kessler, Loftis, et al. Behavior Research Methods, 39, 445–459, 2007), and we collected semantic categorization latencies. Results from hierarchical multiple regression analyses showed that imageability and BOI separately accounted for unique latency variability in each task, even with several other predictor variables (e.g., print frequency, number of syllables and morphemes, age of acquisition) entered first in the analyses. These ratings should be useful to researchers interested in manipulating or controlling for the effects of imageability and BOI for multisyllabic stimuli in lexical and semantic tasks.     

A PET meta‐analysis of object and spatial mental imagery

Neuroimaging studies have described the functional neuroanatomy of mental imagery. Taken separately, specific studies vary in the nature of the task used and are limited by statistical power and sensitivity. We took advantage of a multistudy PET database of 54 subjects acquired in our laboratory to reveal the neural bases of spatial versus object mental imagery tasks. Our first goal was to evaluate to what extent the activated foci elicited by both object and spatial studies overlap. A second aim was to compare activations elicited by spatial imagery tasks to those elicited by object imagery tasks. We also explored applying regression analyses to the relationships between the scores on the Mental Rotations Test (MRT) and changes in regional cerebral blood flow (rCBF) during spatial and object imagery tasks. This meta‐analysis yielded the following observations: (1) both spatial and object imagery tasks shared a common neural network composed of occipitotemporal (ventral pathway) and occipitoparietal (dorsal pathway) regions and also by a set of frontal regions (related to memory); (2) the superior parietal cortex was more strongly implicated during spatial imagery; (3) object imagery specifically engaged the anterior part of the ventral pathway, including the fusiform, parahippocampal, and hippocampal gyrus; (4) object imagery activated the early visual cortex, whereas spatial imagery induced a deactivation of the early visual cortex; (5) blood flow values in some of the regions noted above were positively correlated with scores on the MRT: the higher the subjects performed on the MRT, the more pronounced the rCBF was in these regions. These results may reconcile some of the apparent discrepancies among previous studies concerning the activation of early visual cortex in mental imagery. They also contribute to a better knowledge of the neural bases of object and spatial mental imagery.     

Subject‐object polarity

The Royal Society report updates the anthropogenic impacts on ecosystems services and our inability to rise to this challenge. Sustainable development is argued to be a linguistic device that has been instrumental in deflecting us from addressing the paradox at the heart of the oxymoron. The relationships between the social, environmental, and economic are explored together with the utility of the I = PAT equation, with reference to the Hardin Taboo, Jevons's, and Easterlin's paradoxes. A more prominent role for phronesis in the management of human affairs and the adoption of ethics as the language for dealing with such issues are advocated.     

On the relation between object and action: Response consistency and stimulus–response compatibility

A series of four experiments investigated factors influencing the selection of objects and responses associated with the objects. The experiments focused on the interaction between response consistency and the spatial compatibility of the response (involving inhibition of an irrelevant distractor) in conditions of task switching. To test for the response consistency effect, a cue indicated the dimension of the display to be selected for the participant's response. The stimulus displays were either consistent, neutral, or inconsistent (including a distractor stimulus) with the response to the stimulus. The responses were either compatible or incompatible with the location of the stimulus. Intertrial dependences were examined by switching or repeating the tasks across trials. The results suggest that links between objects and actions set up by targets can be replaced by links between a distractor and a response under certain conditions. The implications for stimulus and response selection are discussed.     

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.     

Which spatial abilities and strategies predict males' and females' performance in the object perspective test?

The present study aimed to investigate whether different spatial abilities and strategies sustain perspective-taking (PT) performance in males and females. The PT task used was the Object Perspective Test (OPT, Kozhevnikov and Hegarty in Mem Cogn 29:745-756, 2001; Hegarty and Waller in Intelligence 32:175-191, 2004). A sample of 40 males and 40 females completed the OPT and several other visuo-spatial tasks and questionnaires. Multiple regression analysis showed that OPT performance was predicted positively by a spatial imagery preference and negatively by the specific use of mental rotation strategy (i.e. turning the sheet of paper). Gender interacted with the Embedded Figure Test (EFT), a spatial visualization task, since high EFT scores only positively predicted the OPT results in males. Overall, our results show that OPT performance is sustained by specific spatial abilities and strategies modulated, at least in part, by gender.     

Is object recognition automatic?

A new paradigm is proposed that involves a simple judgment on an object’s perceptual feature that is independent of object identity. Subjects were required to categorize as vertical or horizontal the main axis of elongation of an object picture. Both fake and real-world objects were presented, and a graphical manipulation was applied to their shapes so that the canonical elongation of the real-world objects was incongruent with the elongation of their shapes after the manipulation. The results showed an influence of the identity of the objects on the perceptual task in the form of a cost in judging the elongation of the incongruent real-world objects. The results are taken as evidence for automatic activation of objects’ stored representations. A “horse-race” model of the influence of these representations on the perceptual task is proposed in the final section of the article.     

Nine-month-olds’ shared visual attention as a function of gesture and object location

Two factors hypothesized to affect shared visual attention in 9-month-olds were investigated in two experiments. In Experiment 1, we examined the effects of different attention-directing actions (looking, looking and pointing, and looking, pointing and verbalizing) on 9-month-olds’ engagement in shared visual attention. In Experiment 1 we also varied target object locations (i.e., in front, behind, or peripheral to the infant) to test whether 9-month-olds can follow an adult’s gesture past a nearby object to a more distal target. Infants followed more elaborate parental gestures to targets within their visual field. They also ignored nearby objects to follow adults’ attention to a peripheral target, but not to targets behind them. In Experiment 2, we rotated the parent 90° from the infant’s midline to equate the size of the parents’ head turns to targets within as well as outside the infants’ visual field. This manipulation significantly increased infants’ looking to target objects behind them, however, the frequency of such looks did not exceed chance. The results of these two experiments are consistent with perceptual and social experience accounts of shared visual attention.