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Adapting a memory framework (source monitoring) to the study of closure processes.

The present experiments adapt a memory framework (source monitoring) to the study of closure processes. Closure processes are invoked as explanatory mechanisms underlying the ability to identify objects under conditions of incomplete visual information. If closure processes are activated, filling in missing pieces of visual information, intriguing memory predictions follow. When making source judgments about the way in which visual information was experienced initially (e.g., complete or incomplete in form), a particular kind of memory error should be evident. Incomplete visual information should be remembered as complete in form, and indeed, this error is observed. The present experiments test alternative interpretations for the initial reports of this memory error in the context of a search task modeled after the Where's Waldo? children's books. The effects of several new factors (e.g., familiarity) are reported, and alternative interpretations for the bias to report complete are eliminated. Findings, therefore, have implications for understanding the mechanisms of closure processes, as well as for the source-monitoring framework itself.

Adaptation, Psychological↗

Contour grouping: closure effects are explained by good continuation and proximity.

Previous experimental studies have provided evidence that closed contours are easier to detect than open contours in random-element displays, and previous theoretical studies have shown that these effects might be explained by an active neural mechanism (e.g., a "reverberating neural circuit") sensitive to closure. To test this hypothesis, detection thresholds were measured in five experiments designed to control for the effects of uncertainty, eccentricity, and element density. In four of the experiments, we found that closed contours were no easier to detect than open contours, and in the remaining experiment the effects were consistent with the predictions of probability summation. Thus, we could find no evidence for an active neural mechanism that enhances detectability of closed contours more than open contours, although some form of closure mechanism may play a significant role in image interpretation.

Form Perception↗

Effects of voluntary attention on structured afterimages.

The effect of voluntary attention on afterimage fragmentation was explored in two experiments. The afterimage, in the form of a 30 degrees-tilted star of David, was generated after prolonged steady fixation in the first experiment, and with a brief and intense flash in the second experiment. Subjects were instructed to select various target shapes in the afterimage for attention and, at the same time, observe what was visible or invisible. Verbal reports and manual responses to afterimage changes were analyzed. Attended shapes were found to disappear from awareness Faster than unattended ones (experiment 1), and complementary shapes were found to predominate visual awareness when one of the pair was selected for attention (experiment 2). Voluntary attention was also found to affect closure (filling-in of enclosed regions) and smoothing of line figures in afterimages.

Attention↗

Visual perceptual learning in human object recognition areas: a repetition priming study using high-density electrical mapping.

It is often the case that only partial or degraded views of an object are available to an observer, and yet in many of these cases, object recognition is accomplished with surprising ease. The perceptual filling-in or "closure" that makes this possible has been linked to a group of object recognition areas in the human brain, the lateral occipital (LO) complex, and has been shown to have a specific electrophysiological correlate, the N(cl) component of the event related potential. Perceptual closure presumably occurs because repeated and varied exposure to different classes of objects has caused the brain to undergo "perceptual learning," which promotes a robust mnemonic representation, accessible under partial information circumstances. The present study examined the impact of perceptual learning on closure-related brain processes. Fragmented pictures of common objects were presented, such that information content was incrementally increased until just enough information was present to permit closure and object recognition. Periodic repetition of a subset of these picture sequences was used to induce repetition priming due to perceptual learning. This priming has an electrophysiological signature that is putatively generated in the LO complex, but significantly precedes the electrophysiological correlate of closure. The temporal progression of priming- and closure-related activity in the LO complex supports the view that sensory processing entails multiple reentrant stages of activity within processing modules of the visual hierarchy. That the earliest priming-related activity occurs over LO complex, suggests that the sensory trace itself may reside in these object recognition areas.

Adult↗

Right hemisphericity of Australian aboriginal children: effects of culture, sex, and age on performances of closure and similarities tests.

Right-handed Aboriginal and White Australian urban children were compared in two Greater Sydney areas having substantial Aboriginal subpopulations. The Aboriginal children performed better than their White counterparts on a (right-hemisphere dependent) Closure or Gestalt Completion test, even though they did not do as well on the (left-hemisphere dependent) WISC-R Similarities test. Performance on both tests varied directly with age. Similarities performance as a function of age increased at a greater rate for White than for Aboriginal children. Partition of the Closure items into those containing or not containing one or more parts with elaborated part boundaries showed that items with such elaboration improved with age more than items without elaboration. The sex difference in Closure performance was limited to a male advantage for items without elaborated parts.

Adolescent↗

Reassessment of inferring personality traits from Bender-Gestalt drawing styles.

Fifty patients with closure difficulty on the Bender-Gestalt and 50 patients with edging tendencies on the Bender Gestalt were assessed for possible personality traits associated with those drawing styles. Patients with and without the drawing styles were compared using MMPI data. Patients who drew along the edge of the paper showed no significant difference in MMPI scores when compared to non-edgers. Patients with closure difficulty were significantly higher on Scale O of the MMPI than were the non-closure difficulty patients. The difference was not considered to be interpretatively important.

Adolescent↗

Detection of contour continuity and closure in three-month-olds.

The present study used an operant conditioning procedure and contour integration stimuli to test three-month-olds' sensitivity to both contour continuity and contour closure. The data demonstrate an immaturity of continuity detection and a lack of closure detection at that age, relative to a previous finding of a heightened sensitivity to closed contours in adult observers. This finding modifies the general view of infant visual perception that has been more focused on the quantitative development of various aspects of visual perception, including contrast sensitivity, binocular disparity processing, perceptual completion, and other perceptual skills. These results suggest qualitative change in terms of the organization of visual information during development, and implications of this finding for visual maturation of mechanisms suggested to underlie these detection abilities are discussed.

Conditioning, Operant↗

Gestalt concept of closure: a construct without closure.

This comment reviews the original Gestalt literature which introduced the concept of 'closure'. It is argued that the meaning of 'closure' was confounded in the source literature and, thus, the term connotes more than it denotes. Research based on different measures of this ambiguous construct inevitably may not always converge.

Gestalt Theory↗

Investigations of closure processes: what source-monitoring judgments suggest about what is "closing".

On many occasions, the perception of an object is based on incomplete information because portions of the object are occluded from view. Nevertheless, people are able to identify an occluded object, suggesting that the identification is mediated by the activation of completion processes which "fill in" the missing information. Although these completion processes are invoked as causal mechanisms for many phenomena, the processes mediating the "completion" have not been specified. The present experiments tested two potential explanations for closure processes. In each experiment, participants were presented with pictures, complete or incomplete in form, and, on a surprise source-monitoring task, they were then asked to remember whether pictures had been presented complete or incomplete in form. Whether viewing pictures of objects, faces, or camouflaged objects, participants showed a pronounced tendency to claim that incomplete pictures were actually presented complete in form. This bias was evident after the participants described functions for objects (Experiments 1, 1A, and 2), after they evaluated properties of faces (Experiment 4), and after they searched for objects hidden in a complex scene (Experiment 5). However, this bias was not evident after they simply named objects portrayed in pictures (Experiment 3). This bias is interpreted as evidence for the activation of implicit imaginal processing. The results of these experiments are informative in their contribution to our understanding of the bases of closure, an intuitively appealing notion frequently invoked to account for object identification, but, as yet, not fully understood.

Analysis of Variance↗

Complementary colors' effect on closure speed.

Contour closure of complementary colors as figure/ground (measured as RT and correct recognition) was difficult for 20 subjects. Perhaps this involves opponent cells in lateral geniculate nucleus.

Adult↗

The late positive component (P300) and information processing in sentences.

Averaged visual evoked potentials to sequentially flashed words comprising a sentence were recorded from vertex and left and right temporoparietal electrodes in 8 right-handed subjects. In condition 1 the sentence took the form: The -eel is on the shoe, in which the first grapheme was omitted from the second word, so that the subject did not know the meaning of the second word until he viewed the last word. In condition 2, the sentence took the form: The heel is on the shoe, in which the second word was given and the last word provided no further information. P300 latency to words which delivered information (last word of condition 1, second word of condition 2) were significantly longer than P300 latency to any of the other words in the sentence, as well as to the same position word in the other condition. Comparisons of P300 latencies to redundant words (the, is, on) within and between conditions showed no significant differences. P300 amplitude to the last word was significantly larger than P300 amplitude to any of the other words within the sentence, even in condition 2 where the second word delivered information. The major effect of information delivery was on P300 latency, while "syntactic closure" had its major effect on P300 amplitude. The fact that evoked potentials to all words had P300 components was attributed to the engagement of the P300 system whenever task-related language stimuli are used.

Adolescent↗

Correlates of performance on the Gollin and Mooney tests of visual closure.

One hundred and twenty-seven undergraduate students variously performed a computerized version of the Gollin (1960) Incomplete Figures Test, the Mooney (1957) Test of Incomplete Face Perception, the Poppelreuter (1917) Overlapping Figures Test, and a visual search task. Performance of male subjects was superior to that of female subjects on the Mooney test but inferior on the visual search task. Correlation and regression analyses showed that the only significant predictor of Gollin test scores was latency to identify all items in the Overlapping Figures Test. There was no relationship between performances on the Gollin and Mooney tests or between Gollin or Mooney test performance and visual search latency. The Gollin and Mooney tests appear to access different perceptual processes, none of which is dependent on the efficiency of visual search.

Adolescent↗

Influences on cognitive engagement: epistemological beliefs and need for closure.

BACKGROUND: Research indicates that achievement goals influence cognitive engagement, which, in turn, influences academic achievement. We believe that there are other individual difference variables in the realm of personal epistemology that may also directly or indirectly influence cognitive engagement; specifically, epistemological beliefs and epistemological motives (e.g. need for closure). AIMS: This study proposed and tested a conceptual model of relationships among epistemological variables (epistemological beliefs and need for closure), achievement goals (mastery, performance-approach, performance-avoidance) and cognitive engagement. SAMPLE: Two hundred and fifty-nine students attending university in the US volunteered to participate in the study. Students represented a variety of academic disciplines and ranged from 18 to 58 years. METHODS: The participants completed three paper-and-pencil surveys: the Epistemological Beliefs Inventory; the Attitudes, Beliefs, and Experiences Inventory (a measure of need for closure); and the Approaches to Learning Survey (a measure of achievement goals and cognitive engagement). RESULTS: Structural equation modelling supported the model in general, although not all proposed paths were significant. Correlational analyses further indicated that epistemological beliefs and need for closure are both potentially important variables for understanding learners' treatment of knowledge in instructional settings. CONCLUSIONS: There are individual differences in epistemological beliefs and motives that may influence the goals students pursue in learning settings and the nature of their cognitive engagement.

Achievement↗

[The construction, reliability and validity of a Japanese Need for Closure Scale].

The purpose of this study was to develop a Japanese Need for Closure Scale. In Study 1, Webster and Kruglanski's (1994) Need for Closure Scale was translated into Japanese, and administered to 240 undergraduates. Factor analysis of the Japanese version indicated that a three-factor structure was most appropriate. In Study 2, a revised scale was developed based on the result of Study 1, and administered to 577 undergraduates. Analysis of the revised Japanese Need for Closure Scale showed that it had sufficient internal consistency and test-retest reliability. In addition, confirmatory factor analysis indicated that the scale had a multidimensional structure. In Study 3, the scale was administered together with five relevant personality scales to 340 undergraduates, and sufficient construct validity of the scale was demonstrated.

Adult↗

Closure difficulty, figure-size expansion, and figure-size constriction on 240 Graham-Kendall Memory-for-Designs records.

To determine the frequency of occurrence of closure difficulty, figure-size expansion, and figure-size constriction, 240 university students were administered the Graham-Kendall Memory-For-Designs test. Subjects were volunteers enrolled in undergraduate psychology courses and were between 18 and 23 yr. of age, male or female, and U.S. citizens. The purpose was to define a sampling of drawing styles exhibited in a normal group on this test. Each drawing style, or factor, was treated as an independent variable, and the frequency of occurence of each level (dependent variable) was compared via chi square. It was noted that a significant number of subjects exhibited some degree of closure difficulty with the designs (X2 = 101.72, p less than .01). Figure-size expansion was noted as extremely rare for this sample (X2 = 444.78, p less than .01). Finally, extreme figure-size constriction occurred significantly more often than either moderate or no contriction of the designs (X2 = 62.58, p less than .01).

Adolescent↗

Autocracy bias in informal groups under need for closure.

Two experiments investigated the tendency of groups with members under high (vs. low) need for cognitive closure to develop an autocratic leadership structure in which some members dominate the discussion, constitute the "hubs" of communication, and influence the group more than other members. The first experiment found that high (vs. low) need for closure groups, as assessed via dispositional measure of the need for closure, manifested greater asymmetry of conversational floor control, such that members with autocratic interactional style were more conversationally dominant and influential than less autocratic members. The second experiment manipulated the need for closure via time pressure and utilized a social network analysis. Consistent with expectation, groups under time pressure (vs. no pressure) showed a greater asymmetry of participation, of centrality, and of prestige among the group members, such that the more focal members were perceived to exert the greater influence over the groups' decisions.

Analysis of Variance↗

Obsessions and compulsions and intolerance for uncertainty in a non-clinical sample.

It has been hypothesized that decision-making difficulties in patients with obsessive-compulsive disorder may arise from intolerance for uncertainty. We investigated the relationship between obsessivity and intolerance for uncertainty (defined in terms of need for cognitive closure), controlling for state and trait anxiety and depression. We tested nonclinical subjects through the Need for Closure Scale (NFCS), the Padua Inventory Revised (PI-R), the Beck Depression Inventory (BDI), and the State-Trait Anxiety Inventory (Form-Y; STAI-Y). A principal component analysis showed a lack of correlation between the PI-R and the NFCS subscales. A set of multiple regression analyses performed on PI-R subscales showed that the need for cognitive closure cannot be considered as a strong predictor of obsessions and compulsions. These results speak against the hypothesis that people with high obsessivity have difficulties in taking decisions because of a cognitive need for certainty. We instead argue that difficulties in taking decisions may be related to other specific cognitive beliefs or meta-beliefs.

Adolescent↗

Restructuring ability and patterns of physics achievement.

For a sample of 24 male and 19 female college students, persons with high visualization (F1,36 = 7.60, P less than .01) and low flexibility of closure (F1,36 = 6.54, P less than .02) attained significantly higher achievement in physics than persons with low visualization or high flexibility of closure. Persons with high restructuring ability and high spatial visualization (M = 88.64, SD = 15.6) attained a significantly higher level of physics achievement than persons with high restructuring ability and low spatial visualization (M = 56.5, SD = 25.1). Flexibility of closure, spatial visualization, and the embedded figures test accounted for 23.8%, 18.4%, and 53% of the variability in physics achievement among the entire sample, among amles, and among females, respectively. The data provided moderate support for the field-dependence--independence model of psychological differentiation and for investigators who reported a possible link between field-dependence--independence, visualization, and extent of neurological lateralization.

Achievement↗