Incomplete figure perception and invisible masking

The Gollin test (measuring recognition thresholds for fragmented line drawings of everyday objects and animals) has traditionally been regarded as a test of incomplete figure perception or 'closure', though there is a debate about how such closure is achieved. Here, figural incompleteness is considered to be the result of masking, such that absence of contour elements of a fragmented figure is the result of the influence of an 'invisible' mask. It is as though the figure is partly obscured by a mask having parameters identical to those of the background. This mask is 'invisible' only consciously, but for the early stages of visual processing it is real and has properties of multiplicative noise. Incomplete Gollin figures were modeled as the figure covered by the mask with randomly distributed transparent and opaque patches. We adjusted the statistical characteristics of the contour image and empty noise patches and processed those using spatial and spatial-frequency measures. Across 73 figures, despite inter-subject variability, mean recognition threshold was always approximately 15% of total contour in naive observers. Recognition worsened with increasing spectral similarity between the figure and the 'invisible' mask. Near threshold, the spectrum of the fragmented image was equally similar to that of the 'invisible' mask and complete image. The correlation between spectral parameters of figures at threshold and complete figures was greatest for figures that were most easily recognised. Across test sessions, thresholds reduced when either figure or mask parameters were familiar. We argue that recognition thresholds for Gollin stimuli in part reflect the extraction of signal from noise.     

Comparing solid-body with point-light animations

The movement of faces provides useful information for a variety of tasks and is now an active area of research. We compare here two ways of presenting face motion in experiments: as solid-body animations and as point-light displays. In the first experiment solid-body and point-light animations, based on the same motion-captured marker data, produced similar levels of performance on a sex-judgment task. The trend was for an advantage for the point-light displays, probably in part because of residual spatial cues available in such stimuli. In the second experiment we compared spatially normalised point-light displays of marker data with solid-body animations and pseudorandom point-light animations. Performance with solid-body animations and normalised point-light displays was similar and above chance, while performance with the pseudorandom point-light stimuli was not above chance. We conclude that both relatively few well-placed points and solid-body animations provide useful information about facial motion, but that a greater number of randomly placed points does not support above-chance performance. Solid-body animations have the methodological advantages of reducing the importance of marker placement and are more effective in isolating motion information, even if they are subsequently rendered as point-light displays.     

American and Japanese women use different coping strategies during normal pregnancy

In this longitudinal study, pregnant women in Japan and the United States reported on three coping strategies. Two are individually phrased: personal influence over outcomes and acceptance of outcomes. The third, social assurance, is grounded in relationships, noting that close others can influence outcomes. A European American sample rated acceptance highest as a strategy, whereas Japanese women rated social assurance highest. For Americans, acceptance correlated with better pregnancy outcomes (less distress over time, better prenatal care, and less weight gain). For Japanese women, social assurance predicted a more positive maternal relationship. Acceptance correlated with less Time 1 distress in both samples. Surprisingly, personal influence generally did not predict positive outcomes in either sample, perhaps because normal pregnancy is a time-limited event with a positive prognosis. The findings are consistent with the view that well-being is related to individual variables in the United States but also to features of social relationships in Japan.     

Enduring and Perduring Objects in Minkowski Space-Time

I examine the issue of persistence over time in thecontext of the special theory of relativity (SR). Thefour-dimensional ontology of perduring objects isclearly favored by SR. But it is a different questionif and to what extent this ontology is required, andthe rival endurantist ontology ruled out, by thistheory. In addressing this question, I take theessential idea of endurantism, that objects are whollypresent at single moments of time, and argue that itcommits one to unacceptable conclusions regardingcoexistence, in the context of SR. I then propose anddiscuss a plausible account of coexistence forperduring objects, which is free of these defects. This leaves the endurantist room for some maneuvers. I consider them and show that they do not really helpthe endurantist out. She can accommodate the notionof coexistence in the relativistic framework only atthe cost of renouncing central endurantist intuitions.     

Neurophysiological codes of words in subcortical structures of the human brain.

Investigations into the cerebral mechanisms of mental activity, using modern mathematical-technical capabilities, allows the transition from study of structural-functional organization to a new stage: the study of neural coding of these cerebral processes.Here we present the results of studying the elementary components of the neurophysiological pattern-code of words and the neurophysiological correlates of the simplest mental processes, generalization, and mental conclusion. The elementary components of the pattern-code are the group sequences of neuronal firing with comparatively stable intervals in between. The processes of mental conclusion and decision making occur when full, compressed, and complex patterns-codes appear in the brain.In discussing the data obtained, the problems of relationship between a part and the whole in activity of cerebral systems is considered, and the hypothesis of a dynamic pace-maker mechanism for cerebral organization of mental activity, is proposed.