Biomedical subjects

M J Kavsek

Publications and source records attributed to M J Kavsek.

3 recordsLinked to original sources

PubMed1999

Infants' responsiveness to line junctions in curved objects.

Several empirical studies demonstrate that infants under 6-7 months of age are unable to extract static-monocular depth information from their environment. The aim of this study was to extend these findings by using a three-dimensional structure indicated by curved Y junctions. Infants 5 and 8 months of age were habituated to the line drawing of a cylinder. During test trials, the infants viewed two displays, one in which a surface marking had been deleted from the habituation figure and one in which an edge had been erased. An ANOVA revealed that the 8-month-old subjects looked significantly longer at the dishabituation display lacking the edge, whereas the 5-month-olds did not. The results provide evidence that 8-month-old infants distinguish between lines indicating edges and lines indicating markings and that they are able to use line junctions to perceive line drawings as depictions of three-dimensional objects in the picture plane.

Analysis of Variance↗

PubMed1996

[Multidimensional scaling of color patterns of the DIN color chart].

The DIN color chart was developed in the 1950s by Manfred Richter using of classical psychophysical scaling techniques. It is based upon the idea that colors are ordered along three subjective dimensions, i.e. hue, saturation, and brightness. Furthermore, it is assumed that the colors of the DIN color chart fulfill the principle of specific equidistancy. The main aim of this study was to investigate this claim empirically. More specifically, it was tested whether colors of the same hue and brightness are equally spaced along the dimension of subjective saturation. The data were collected in three paired comparisons experiments and were analyzed using multidimensional scaling. According to the results, the psychological properties of the DIN color system can be replicated approximately. In addition to a confirmation of the postulate of equidistancy this research contributes to the understanding of the convergence of different scaling methods.

Adult↗

PubMed1995

[Gaze behavior in infancy as an indicator of information processing].

Many studies on perceptual development in infancy use visual attention behaviour as an indicator of intellectual capacities. Decrement of attention with repeated exposure to a visual stimulus (habituation) and recovery of attention to a novel stimulus (dishabituation) are interpreted as reflecting the infant's processing of stimulus information. This information processing interpretation as well as the main empirical habituation-dishabituation procedures are explained. Furthermore, sensory adaptation arguments for habituation and dishabituation are discussed and refuted. Following this critical discussion, empirical evidence for the information processing point of view is given. In this context, investigations are mentioned which indicate substantial correlations between early habituation and dishabituation and later intelligence. These studies support a continuity perspective of mental development from infancy.

Attention↗