The stereoscopic anisotropy affects manual pointing

Abstract

Although binocular disparity can in principle provide absolute depth information, perceived stereoscopic depth depends on the relative disparities between points and their spatial arrangement. An example of this is the stereoscopic anisotropy--observers typically perceive less depth for stereoscopic surfaces when depth varies in the horizontal direction than in the vertical direction. We investigated whether this anisotropy also affects manual pointing. Participants were presented with stereograms depicting surfaces that were slanted in depth about either a horizontal axis (inclination) or a vertical axis (slant), and were asked either to point to the edge of a surface, or to estimate its inclination or slant. For both tasks, a clear anisotropy was observed, with participants perceiving greater depth, and also pointing out steeper surfaces, for inclined surfaces than for slanted surfaces. We conclude that both perception and the control of action are subject to a similar stereoscopic anisotropy, and that performance on the two tasks relies on similar depth processing mechanisms.

Victim Sensitivity and Its Neural Correlates Among Patients With Major Depressive Disorder

“…In line with previous studies on the association between victim sensitivity and depressive symptoms in non-clinical samples or personality traits related to depression (6,42,43), the present study found that patients with MDD had higher sensitivity to injustice as a victim. Particularly, this hypersensitivity can be found in a group of first episodic, drug-naïve patients with MDD, suggesting that the increased victim sensitivity was free from the confounding effect of chronic illness or antipsychotic drugs and could be observed even in the early stage of depression.…”

Aging and the perception of slant from optical texture, motion parallax, and binocular disparity

“…Such reduced slopes have also been obtained in past research. Both van Ee (2001; see the left panel of his Figure 4) and Bradshaw, Hibbard, van der Willigen, Watt, and Simpson (2002;see their Figure 4) found that the rate of increase in perceived slant (relative to increases in simulated slant) was considerably less than 1.0. Our stereoscopic results are especially close to those in Bradshaw et al (see their Figures 4A and 4C).…”