Temporal integration of monocular images separated in time: stereopsis, stereoacuity, and binocular luster

We evaluated stereopsis and binocular luster using electronically controlled shutter glasses with alternating monocular stimulation. In Experiment 1, we used the standard method for testing stereoacuity to obtain a gradual measure of stereopsis. Stereo thresholds decreased with increasing alternating frequency of two monocular half-images without a delay between them. Increasing delays led to increasing thresholds. In Experiment 2, we compared stereopsis resulting from two monocular half-images of a random-dot stereogram and binocular luster with respect to the minimum alternating frequency of the two half-images and the maximum interocular delay that were tolerated without a breakdown of the impression. Below 3 Hz, no stereopsis occurred. Binocular luster was observed only above 10 Hz. The mean threshold of interocular delay for detecting the global figure in a random-dot stereogram was about 51 msec, but for binocular luster it was about 20 msec. Overall, temporal integration was better for stereopsis than for binocular luster.     

The role of first- and second-order stimulus features for human overt attention

When processing complex visual input, human observers sequentially allocate their attention to different subsets of the stimulus. What are the mechanisms and strategies that guide this selection process? We investigated the influence of various stimulus features on human overt attention--that is, attention related to shifts of gaze with natural color images and modified versions thereof. Our experimental modifications, systematic changes of hue across the entire image, influenced only the global appearance of the stimuli, leaving the local features under investigation unaffected. We demonstrated that these modifications consistently reduce the subjective interpretation of a stimulus as "natural" across observers. By analyzing fixations, we found that first-order features, such as luminance contrast, saturation, and color contrast along either of the cardinal axes, correlated to overt attention in the modified images. In contrast, no such correlation was found in unmodified outdoor images. Second-order luminance contrast ("texture contrast") correlated to overt attention in all conditions. However, although none of the second-order color contrasts were correlated to overt attention in unmodified images, one of the second-order color contrasts did exhibit a significant correlation in the modified images. These findings imply, on the one hand, that higher-order bottom-up effects--namely, those of second-order luminance contrast--may partially account for human overt attention. On the other hand, these results also demonstrate that global image properties, which correlate to the subjective impression of a scene being "natural," affect the guidance of human overt attention.     

The neural regions sustaining episodic encoding and recognition of objects

In this functional MRI experiment, encoding of objects was associated with activation in left ventrolateral prefrontal/insular and right dorsolateral prefrontal and fusiform regions as well as in the left putamen. By contrast, correct recognition of previously learned objects (R judgments) produced activation in left superior frontal, bilateral inferior frontal, and right cerebellar regions, whereas correct rejection of distractor objects (N judgments) was associated with activation in bilateral prefrontal and anterior cingulate cortices, in right parietal and cerebellar regions, in the left putamen, and in the right caudate nucleus. The R minus N comparison showed activation in the left lateral prefrontal cortex and in bilateral cingulate cortices and precunei, while the N minus R comparison did not reveal any positive signal change. These results support the view that similar regions of the frontal lobe are involved in episodic encoding and retrieval processes, and that the successful episodic retrieval of newly learned objects is mainly based on a frontoparietal network.     

Seeing while moving: measuring the online influence of action on perception

The online influence of movement production on motion perception was investigated. Participants were asked to move one of their hands in a certain direction while monitoring an independent stimulus motion. The stimulus motion unpredictably deviated in a direction that was either compatible or incompatible with the concurrent movement. Participants' task was to make a speeded response as soon as they detected the deviation. A reversed compatibility effect was obtained: Reaction times were slower under compatible conditions—that is, when motion deviations and movements went in the same direction. This reversal of a commonly observed facilitatory effect can be attributed to the concurrent nature of the perception-action task and to the fact that what was produced was functionally unrelated to what was perceived. Moreover, by employing an online measure, it was possible to minimize the contribution of short-term memory processes, which has potentially confounded the interpretation of related effects.     

Die ökologische Dimension der Psychoanalyse und das Konzept der inneren Nachhaltigkeit

Zusammenfassung. Der Autor begründet in seiner Arbeit eine „?kologisch-psychoanalytische” Theorieperspektive, in der er die innere Verwandtschaft zwischen dem modernen ?kologiekritischen Denken und den Menschenbildannahmen der freudianischen Psychoanalyse aufzeigt. Die „kritische ?kologie” befasst sich mit der Frage nach einer sinnvollen, „nachhaltigen” Gestaltung der Kultur-Natur-Beziehung, die Psychoanalyse erforscht und behandelt die innere Selbstbeziehung des Menschen zwischen dem kulturgepr?gt-kulturproduktiven „Ich” und den eigengesetzlichen, natural fundierten motivationalen Seiten der Psyche, die bei Freud als „Es” gefasst werden. Auch die modernen objektbeziehungstheoretischen und selbstpsychologischen Weiterentwicklungen der Psychoanalyse k?nnen vor einem ?kologisch-psychoanalytischen Hintergrund so aufgefasst werden, dass Freuds Fragestellung nach der ge- oder misslingenden Balance bzw. Integration zwischen den motivationalen (Interaktions-) Strebungen der „inneren Natur” einerseits und den Anforderungen der „kulturellen Selbsterzeugung” des Menschen andererseits rahmengebendes Grundthema bleibt. Der Autor macht in seinem Artikel deutlich, dass Psychoanalyse und „kritische ?kologie” gegenseitig voneinander profitieren k?nnen.

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The ecological dimension of psychoanalysis and the concept of inner sustainability

Summary. The author develops an ”ecological-psychoanalytical” perspective of theory that shows the inner relationship between the modern eco-critical thinking and the anthropology of Freudian psychoanalysis. ”Critical ecology” engages in the search for a ”sustainable” organisation of the culture-nature-relationship. Psychoanalysis explores and treats the inner self-relation of man among the culture-imprinted/culture-producing ”Ego” and the nature-founded motivational aspects of psychic, that Freud called the ”Id.” The modern developments of object-relation theory and self psychology can be interpreted as reaffirming Freuds thesis of a well balanced or neurotising integration of motivational (interaction-) drives of ”inner nature” at one hand, and the demands of the ”cultural autogenesis” of man on the other. The author suggests that psychoanalysis and human ecology theory can each profit from the other.

     

Wo steht der Jugendmaßregelvollzug in Deutschland aktuell?

With up to 67% of all young offenders suffering from mental illnesses, the question of how professional care should be arranged for them arises. The ability to detain a young offender for an indefinite period of time in a forensic psychiatric institution represents the final solution in juvenile law. This currently affects approximately 300 patients nationwide, of which there is precise data available only for patients who were detained before the age of 18. This is due to the differing nationwide organisational structures within specific forensic psychiatric institutions for adolescents. There is currently a lack of forensic psychiatric units in several federal states providing treatment for adolescents. When examining under what basis, and when the relocation of a person from a young forensic psychiatric institution into the corresponding adult one occurred, and how long specific pedagogic facilities were provided to these individuals, the differences between various adolescent forensic psychiatric institutions become apparent. This especially concerns young adolescent offenders suffering from delayed mental development.     

Heteroscedasticity as a Basis of Direction Dependence in Reversible Linear Regression Models

Heteroscedasticity is a well-known issue in linear regression modeling. When heteroscedasticity is observed, researchers are advised to remedy possible model misspecification of the explanatory part of the model (e.g., considering alternative functional forms and/or omitted variables). The present contribution discusses another source of heteroscedasticity in observational data: Directional model misspecifications in the case of nonnormal variables. Directional misspecification refers to situations where alternative models are equally likely to explain the data-generating process (e.g., x → y versus y → x). It is shown that the homoscedasticity assumption is likely to be violated in models that erroneously treat true nonnormal predictors as response variables. Recently, Direction Dependence Analysis (DDA) has been proposed as a framework to empirically evaluate the direction of effects in linear models. The present study links the phenomenon of heteroscedasticity with DDA and describes visual diagnostics and nine homoscedasticity tests that can be used to make decisions concerning the direction of effects in linear models. Results of a Monte Carlo simulation that demonstrate the adequacy of the approach are presented. An empirical example is provided, and applicability of the methodology in cases of violated assumptions is discussed.     

The Development of Media Sign Literacy—A Longitudinal Study With 4-Year-Old Children

In a longitudinal study, 137 children at the age of 4 years were tested for media sign literacy, intelligence, and several precursors of academically relevant skills, such as phonological awareness and preschool quantity-number competencies. The children were tested four times over two years, measuring the development of these skills every six months. The purpose of the study was to explore whether children’s level of media sign literacy helps them acquire academically relevant symbolic skills like reading and mathematical competencies. The results indicate that media sign literacy as well as intelligence predict mathematical and linguistic competencies. Longitudinal findings indicate that children with higher levels of media sign literacy also achieve higher scores in precursors of mathematical and reading and writing skills, and structural equation modeling revealed a rich interconnectedness between media sign literacy and intelligence. Media sign literacy had a direct and significant effect on mathematical competencies at measurement point 2 and indirect effects on the precursors of reading and writing skills at measurement point 4.