Spatial reference in multiple object tracking

Spatial reference in multiple object tracking is available from configurations of dynamic objects and static reference objects. In three experiments, we studied the use of spatial reference in tracking and in relocating targets after abrupt scene rotations. Observers tracked 1, 2, 3, 4, and 6 targets in 3D scenes, in which white balls moved on a square floor plane. The floor plane was either visible thus providing static spatial reference or it was invisible. Without scene rotations, the configuration of dynamic objects provided sufficient spatial reference and static spatial reference was not advantageous. In contrast, with abrupt scene rotations of 20°, static spatial reference supported in relocating targets. A wireframe floor plane lacking local visual detail was as effective as a checkerboard. Individually colored geometric forms as static reference objects provided no additional benefit either, even if targets were centered on these forms at the abrupt scene rotation. Individualizing the dynamic objects themselves by color for a brief interval around the abrupt scene rotation, however, did improve performance. We conclude that attentional tracking of moving targets proceeds within dynamic configurations but detached from static local background.     

Disquotationalism, reference, and object dependence

In this paper I consider whether disquotationalist accounts of reference can accommodate our intuitions concerning reference. I argue that, if our intuitions are to be satisfactorily accommodated, the disquotationalist must regard the semantic content of a referring singular term as depending upon the object which is the intuitive referent of that singular term. Granted this, however, the way then looks open for the inflationist about reference to simply identify the object dependence relation with the reference relation. I consider how damaging this is for the disquotationalist, and how she might respond, concluding on a note of pessimism for disquotationalist accounts of reference.     

Selecting spatial frames of reference for visual target localization

This study examined the selection of spatial frames of reference for target localization in visual search. Participants searched for local target characters in global character configurations. The local targets could be localized relative to the character configuration in which they were embedded or relative to the presentation screen on which the configurations were displayed. We investigated under which conditions the configurations, or the screen served as frame of reference for target localization. Three experiments revealed an increasing impact of screen-related target localization with decreasing spatial uncertainty of targets in screen-related coordinates. The results indicate the capability of the visual system to localize relevant visual stimuli with respect to those frames of reference that yield the most redundant spatial distribution of these stimuli.     

The spatial frame of reference in object naming and discrimination of left-right reflections

The effects of stimulus rotation and observer's head-tilt position on various pattern-recognition tasks were investigated to compare the external directions most closely aligned with the spatial frame of reference. Specifically, the effects of these factors on the time to name objects were compared with their effects on the time to discriminate left-facing from right-facing lateral views of these objects, as well as with their effects on the time to discriminate normal from mirror-imaged alphanumeric characters. The naming task relied upon a reference frame more closely aligned with retinal directions than with environmental directions. In contrast, both discrimination tasks relied upon a frame aligned more closely with environmental directions. Overall, the nature of the task exerts a greater influence on the directions with which the frame of reference is aligned than do the stimulus attributes.     

Interactions between symmetry and elongation in determining reference frames for object perception.

Many theories of object recognition posit that objects are encoded with respect to a perceptual frame of reference. Such theories assume that factors such as symmetry and elongation are critical for the assignment of an object's primary axis, and consequently for the extraction of an object's reference frame. The present experiments directly examined the relative roles played by symmetry and elongation in the determination of an object's primary axis, and the extent to which symmetry and elongation interact with one another. We found that observers use both symmetry and elongation in extracting an object's primary axis, that the extent to which each cue dominates depends on its relative salience, and that symmetry and elongation are processed interactively, rather than in encapsulated modules.     

Specificity of reference patterns in depressive thinking: agency and object roles in self-representation

This study investigated A. T. Beck's (1970) negative cognitive triad as a model of depressive thinking. A mixed clinical sample (N = 126) completed the Sentence Completion Test for Depression (SCD) and self-report measures of depression and anxiety. Two reference patterns were tested: agency roles, people who are the source of thoughts, feelings, and actions (self and others); and object roles, points of reference location (self, other, world, future, and past). Cognitive effects were highly specific to depression. With self in agent role, significant correlations were observed with negative self, world, and future references but not with other people or the past. With others in agent role, only negative self references were correlated with depression (e.g., "Some people would not ... put me out if I was on fire"), suggesting an interpersonal extension to the negative cognitive triad.     

Shifting resources to recognize a forming object: Dependencies involving object properties

These experiments indicate that when the eyes and attention are allowed to shift to identify a newly appearing object, the success of the shift depends on properties of the object. Observers attempted to identify a parafoveal target that was followed by a mask. On many trials a prime (cue) was presented immediately before the target. The prime was a group of elements (vertices) that could trigger ocular or attentional shifts. Success of the shifts was measured by increases in identification accuracy relative to a no-prime condition (facilitation effects). Facilitation was high for many primes, but decreased systematically toward zero when the prime-elements were not easily related to form a convex object and were located outside the boundaries of the subsequent target.     

Finding a face in a face-like object

Humans have the tendency to perceive a face even in a non-living object. Previous studies report that people perceive facial features and even interpret a personality in a car front. Following these findings, we investigated whether the perception of a face in a face-like object is mediated by human face processing, which involves both featural and configural processing. In our experiment, participants were presented with 30 face-like objects and were asked about the existence of facial features, the intensity of typicality/distinctiveness, and the intensity of facial expression. Using multiple regression analysis, which predicts the perception of a face in a face-like object, we found that the existence of eyes was a significant predictor of variance in perceiving a face in a face-like object.     

Visual mental representations supporting object drawing: How naming a novel object with a novel count noun impacts on young children's object drawing

Object drawing can be supported by a number of cognitive resources, each making available visual information about the object being drawn. These resources include perceptual input, short-term visual memory, and long-term visual memory. Each of these resources has the potential to make available distinct forms of visual representation, including viewpoint-specific and viewpoint-independent representations, object-specific and category representations, and separate representations of object colour. We review neuropsychological and developmental evidence supporting these claims, including evidence that the same drawing can reflect the influence of multiple forms of visual representation. Seven experiments are then reported, investigating object drawing by 4- to 6-year-old children, to confirm the support for drawing provided by different forms of visual representation. Young children are selected for investigation because their drawing is relatively unconstrained by culturally determined norms which, in our culture, dictate that objects should be drawn just as they appear from the vantage point of the drawer. To distinguish the support provided by object and category representations, the experiments exploit the privileged links between count nouns as object labels, and representations of object categories. In addition, pre-established representations, visual or otherwise, are precluded from influencing drawing by asking the children to draw novel objects, and by creating novel count nouns with which to label the objects. The results reveal how viewpoint-specific perceptual representations, object-specific representations of shape and of colour, and category representations of shape can each impact on object drawing, and in some circumstances on the same drawing. It appears that simple drawing tasks have the potential to reveal some of the distinct types of representation able to support visual cognition.     

Long-term memory for a common object

A series of experiments was done to determine how completely and accurately people remember the visual details of a common object, a United States penny. People were asked to: draw a penny from unaided recall; draw a penny given a list of its visual features; choose from among a list of possible features those which do appear on a penny; indicate what was wrong with an erroneous drawing of a penny; and select the correct representation of a penny from among a set of incorrect drawings. Performance was surprisingly poor on all tasks. On balance, the results were consistent with the idea that the visual details of an object, even a very familiar object, are typically available from memory only to the extent that they are useful in everyday life. It was also suggested that recognition tasks may make much smaller demands on memory than is commonly assumed.     

From object to image to object

Images are mental representations accommodated by grammatical structures. These structures order sensori-input of information as well as provide for articulated ways of expressing motor sequences associated with images. The psychological process of perception is reflected in the development of paradigmatic structures. The psychological process of action (behavior and its mental representations) is reflected in the development of syntagmatic structures. Forming and expressing imagery requires both paradigmatic and syntagmatic structuring. The former relates to logical issues of identity of objects and to the formation of concepts. The latter relates to the solution of psycho-logical questions of causality through articulation of grammatical roles in sentences. Two issues affecting the formation of a model to account for imagery are examined: (1) The tendency to explain imagery as a result of motor sequences and to utilize performance grammar. (2) The impact of ontogenesis on social processes affecting the logical and psycho-logical concerns facing the person at different stages of development. The grammar of imagery is seen as broader than one of performance. The epistemology of imagemaking does not reflect a linear ontogenetic development which precludes attention to problems of creating the logical structures of an object.     

Border collie comprehends sentences containing a prepositional object,verb, and direct object

This study tested the ability of a Border Collie, Chaser, to learn the syntax and semantics of sentences consisting of three elements of grammar, a prepositional object, verb, and direct object. Understanding of the syntax of the sentences required that Chaser emit responses consistent with three elements of grammar sentences, such as to ball take Frisbee. Understanding of the semantics of the sentences required that Chaser respond correctly when the meanings of the sentences were changed by reversing positions of the prepositional object and the direct object in the sentence, such as to Frisbee take ball. Chaser's understanding of the sentences was tested in three different scenarios: (a) when multiple and familiar objects were used in the syntax command sentence, (b) when novel objects were used in the syntax command sentence (novel in the sense that objects had not been used during training), and (c) when vision of objects was not possible at the time the syntax command was verbalized. Findings were statistically significant in all three scenarios. Successful findings were attributed to Chaser's intensive training in her first three years of life. Analysis of the data revealed that Chaser's successful understanding of the syntax sentences required the processing and retention of two sound-object mappings (names-objects) into memory, along with simultaneous judgments concerning which object to take to the other – that is, working memory. These two types of cognitive abilities, memory storage and working memory, raise the bar in terms of our expectations of a dog's potential ability to understand verbal communications. We propose that Chaser's understanding of our three elements of grammar sentences represents a giant leap in her referential understanding of language.     

Visual object affordances: object orientation

Five experiments systematically investigated whether orientation is a visual object property that affords action. The primary aim was to establish the existence of a pure physical affordance (PPA) of object orientation, independent of any semantic object-action associations or visually salient areas towards which visual attention might be biased. Taken together, the data from these experiments suggest that firstly PPAs of object orientation do exist, and secondly, the behavioural effects that reveal them are larger and more robust when the object appears to be graspable, and is oriented in depth (rather than just frontally) such that its leading edge appears to point outwards in space towards a particular hand of the viewer.     

Selecting entrepreneurial employees using a person-group fit perspective

As jobs become unstructured and collective endeavor oriented, it is increasingly being realized that work groups must become more autonomous and entrepreneurial. The selection literature is however silent on the predictive mechanisms that may be leveraged to select group members with the desired competencies. The person-group fit perspective enables us to hypothesize and demonstrate that selection instruments geared toward gauging an individual's fit within a group are likely to manifest entrepreneurial competencies and behaviors in the individual. Further, the nature of the job, in terms of the structuredness of work (task formalization) and the repetitiveness of work activities (task routinization), has a moderating impact on the relationship between overall entrepreneurial competence and selection practices. The study has implications for incorporating the principles of person-group fit into the design of job profiles.     

Memory error in recognizing a pre-change object

People often fail to detect a change between two visual scenes and retrieval failure has been suggested as a reason. We investigated the possibility that retrieval blocking underlies this failure by examining the error pattern in recognizing the pre-change object. The results of Experiment 1 showed that participants were biased toward selecting the lure that was similar to the post-change object when they failed to recognize the pre-change object. This bias was also observed in Experiment 2 when there was sufficient time to encode and consolidate the pre-change object and the bias was as strong as correct recognition in Experiment 3 when participants divided attention during encoding and comparison. The bias in memory error remained significant even when participants had the option to select an “I don’t remember” response in Experiment 4. In Experiment 5, the bias was observed after participants successfully detected a change at an invalidly cued location and after they failed to detect a change at a validly cued location. These findings suggest that blocking can lead to retrieval failure in change detection when participants are aware of a change yet unable to retrieve verbatim traces and also when participants are unaware of a change and use the post-change object to retrieve the identity of the previous object at the same location.