Emotion and object processing in Parkinson’s disease

The neuropsychological literature on the processing of emotions in Parkinson’s disease (PD) reveals conflicting evidence about the role of the basal ganglia in the recognition of facial emotions. Hence, the present study had two objectives. One was to determine the extent to which the visual processing of emotions and objects differs in PD. The other was to assess the impact of cognitive load on the processing of these types of information. Thirty-one patients with idiopathic PD (IPD) under dopamine replacement therapy (DRT) were compared to 30 control subjects on emotion and object recognition tasks. Recognition of objects was more accurate and faster than recognition of facial expressions of emotion, for both groups of subjects. In a second experiment using an N-back procedure with the same stimuli—a more demanding task with a higher cognitive load—patients with IPD were as accurate as control subjects in detecting the correct sequential presentation of stimuli, but were much slower in their decision responses. This indicates that IPD patients under DRT are not impaired in encoding emotion or object information, but that they have difficulty with the processing demands of the N-back task. Thus, patients with IPD appear to be more sensitive to cognitive load than to type of information, whether facial emotions or objects. In this perspective, one must consider that a deafferented dopaminergic system has problems processing more complex information before one can posit the existence of deficits affecting a specific type of information.     

与用客体表征连续性解释OSPBs效应的商榷

Mitroff等人的研究发现了OSPBs效应量反映的客体运动方式与主观报告结果相分离的现象,并以两可刺激情景或实体性原则违背假设对该现象作了解释。本文以3个实验与其研究进行了商榷。结果表明,两可刺激情景与实体性违背均不能解释上述分离现象(实验1);其实验范式中混入了距离因素(实验2与实验3)和方位朝向因素(实验1)。基于本研究的结果,笔者认为Mitroff等人的OSPBs效应是由距离效应和方位倾斜效应所致,即可能主要反映了基于空间的选择性注意的影响,而不能以客体表征连续性加以解释。     

Towards the logic of projective identification

This paper is devoted to the ‘logic of the unconscious’ and its application to the analysis of projective intentionality in psychoanalysis.Subjective assumptions concerning the existence and identity of intentional objects are often unconscious. They result from personal experience through its assimilation and transformation in further psychological (e.g. defensive) processes. Formal aspects of these subjective assumptions and their influence on our judgment and action have been studied by a number of psychoanalytic authors, in particular by Silvano Arieti, Ignacio Matte-Blanco and their followers who tried to develop ‘logic of the unconscious’. My project consists in the reformulation, clarification and elaboration of the logic of the unconscious using contemporary modal and relevant logics, in particular Graham Priest's logic of intentionality. An important advantage of this logic is that it allows for truth indeterminacy and paraconsistency of the propositional content of intentional states. In this article I explore the logic of projective identification, which I assume plays the central role in the logic of the unconscious.Special attention is given to the logical analysis of the notion of an internal object, and to a logical reconstruction of the fantasy of projective identification.     

Representation of object orientation in children: Evidence from mirror-image confusions

Although many cognitive functions require information about the orientations of objects, little is known about representation or processing of object orientation. Mirror-image confusion provides a potential clue. This phenomenon is typically characterized as a tendency to confuse images related by left–right reflection (reflection across an extrinsic vertical axis). However, in most previous studies the stimuli were inadequate for identifying a specific mirror-image (or other) relationship as the cause of the observed confusions. Using stimuli constructed to resolve this problem, Gregory and McCloskey (2010) found that adults’ errors were primarily reflections across an object axis, and not left–right reflections. The present study demonstrates that young children's orientation errors include both object–axis reflections and left–right reflections. We argue that children and adults represent object orientation in the same coordinate-system format (McCloskey, 2009), with orientation errors resulting from difficulty encoding or retaining one (adults) or two (children) specific components of the posited representations.     

Recognizing disguised faces

Across three experiments, we evaluated the effects of “disguises” on observers’ face identification performance using naturalistic images in which individuals posed with a variety of wigs and eyeglasses. Experiment 1 tested recognition memory performance with and without disguises and showed that any changes in these facial attributes hindered performance, replicating previous findings. More interestingly, Experiment 1 revealed that a change in hairstyle or the removal of eyeglasses had more impact on performance than did the addition of eyeglasses. In Experiment 2, disguised and undisguised faces were presented upright or inverted to examine whether the performance decrements seen in Experiment 1 were attributable to disruption of processing strategies for faces. Despite showing an overall effect of disguise on performance, there was no interaction between inversion and disguise. This suggests that disguises are not directly affecting processing strategies, but instead disguises are likely encoded as part of the overall representation. Similarly, in Experiment 3, the composite face paradigm was used to examine whether the impact of disguises is attributable to disruption of holistic processing for faces. Again, we found an overall effect of disguise on performance, but here we also observed that the presence of disguises interacted with participants’ tendency to form holistic face representations.     

Conceptual knowledge attenuates viewpoint dependency in visual object recognition

Learning verbal semantic knowledge for objects has been shown to attenuate recognition costs incurred by changes in view from a learned viewpoint. Such findings were attributed to the semantic or meaningful nature of the learned verbal associations. However, recent findings demonstrate surprising benefits to visual perception after learning even noninformative verbal labels for stimuli. Here we test whether learning verbal information for novel objects, independent of its semantic nature, can facilitate a reduction in viewpoint-dependent recognition. To dissociate more general effects of verbal associations from those stemming from the semantic nature of the associations, participants learned to associate semantically meaningful (adjectives) or nonmeaningful (number codes) verbal information with novel objects. Consistent with a role of semantic representations in attenuating the viewpoint-dependent nature of object recognition, the costs incurred by a change in viewpoint were attenuated for stimuli with learned semantic associations relative to those associated with nonmeaningful verbal information. This finding is discussed in terms of its implications for understanding basic mechanisms of object perception as well as the classic viewpoint-dependent nature of object recognition.     

Eccentricity biases of object categories are evident in visual working memory

In high-order object areas, face-selective areas prefer centrally presented stimuli, whereas building-selective areas prefer peripherally presented stimuli (Levy et al., 2001). We investigated whether this eccentricity bias was also evident in visual working memory. In Experiment 1, we found that working memory performance for faces decreased towards the periphery while the performance for buildings remained unchanged across different eccentricities. To rule out the possibility that lower level features influence these results, we manipulated the spatial frequency of faces and buildings (Experiment 2) and the spatial layout information of the buildings (Experiment 3). In both of the experiments, we replicated the results of Experiment 1, even when these lower level features of stimuli were controlled. Consistent with previous findings, the current results suggest that each object category is processed in a different manner depending on the eccentricity. This eccentricity bias is likely the result of how the high-order object areas represent different object categories.     

Electrophysiological evidence for colour effects on the naming of colour diagnostic and noncolour diagnostic objects

In this study, we investigated the level of visual processing at which surface colour information improves the naming of colour diagnostic and noncolour diagnostic objects. Continuous electroencephalograms were recorded while participants performed a visual object naming task in which coloured and black-and-white versions of both types of objects were presented. The black-and-white and the colour presentations were compared in two groups of event-related potentials (ERPs): (1) The P1 and N1 components, indexing early visual processing; and (2) the N300 and N400 components, which index late visual processing. A colour effect was observed in the P1 and N1 components, for both colour and noncolour diagnostic objects. In addition, for colour diagnostic objects, a colour effect was observed in the N400 component. These results suggest that colour information is important for the naming of colour and noncolour diagnostic objects at different levels of visual processing. It thus appears that the visual system uses colour information, during naming of both object types, at early visual stages; however, for the colour diagnostic objects naming, colour information is also recruited during the late visual processing stages.     

The role of temporal synchrony in perceptual object formation and updating

The appearance and disappearance of an object in the visual field is accompanied by changes to multiple visual features at the object's location. When features at a location change asynchronously, the cue of common onset and offset becomes unreliable, with observers tending to report the most recent pairing of features. Here, we use these last feature reports to study the conditions that lead to a new object representation rather than an update to an existing representation. Experiments 1 and 2 establish that last feature reports predominate in asynchronous displays when feature durations are brief. Experiments 3 and 4 demonstrate that these reports also are critically influenced by whether features can be grouped using nontemporal cues such as common shape or location. The results are interpreted within the object-updating framework (Enns, Lleras, & Moore, 2010), which proposes that human vision is biased to represent a rapid image sequence as one or more objects changing over time.     

Conferring humanness: The role of anthropomorphism in hoarding

Hoarding is characterized by a persistent and extreme difficulty with discarding one’s possessions, often resulting in cluttered living spaces and marked distress or impairment. Despite being increasingly recognized as a substantial public health burden, much remains unknown about the etiology. One facet within the cognitive-behavioral model of hoarding that remains poorly understood is the strong emotional attachment to possessions. The tendency to anthropomorphize (i.e., see human-like qualities in non-human entities) may be one possible mechanism contributing to this emotional attachment. The current report is the first empirical study to examine the association between anthropomorphism and hoarding. Non-clinical participants (n = 72) completed a battery of self-report measures focused on hoarding symptoms, saving cognitions, anthropomorphism, and emotional attachments to personal and novel items. Anthropomorphic tendencies were significantly associated with greater saving behaviors and the acquisition of free things. Levels of anthropomorphism moderated the relationship between specific hoarding beliefs and acquiring tendencies, as well as the emotional attachment towards a novel item. Results are discussed with regard to future research directions, and implications for the cognitive-behavioral model of hoarding.