Perception of Depth in Rotating Objects: 2. Perspective as a Determinant of Stereokinesis

1967 ◽  
Vol 25 (2) ◽  
pp. 621-628 ◽  
Author(s):  
Roy B. Mefferd ◽  
Betty A. Wieland
Keyword(s):  
Viewing Time ◽  
Frontoparallel Plane ◽  
Rotating Objects

10 Os viewed under extreme reduction conditions 5 simple, plane, featureless figures and an Ames trapezoidal window as they rotated slowly (5 rpm) in the frontoparallel plane. Judgments of shape, slant, and type of movement were obtained for 4-min. periods first with binocular regard and later with monocular. As more perspective cues were introduced and as viewing time increased, there were progressive increases in depth indicants with all three types of judgments.

Perception of Depth in Rotating Objects: 1. Stereokinesis and the Vertical-Horizontal Illusion

1967 ◽  
Vol 25 (1) ◽  
pp. 93-100 ◽  
Author(s):  
Roy B. Mefferd ◽  
Betty A. Wieland
Keyword(s):  
Visual Field ◽  
Head Position ◽  
Kinetic Effect ◽  
Frontoparallel Plane ◽  
Apparent Rotation ◽  
The Asymmetry ◽  
Rotating Objects

Os viewed under extreme reduction conditions either a rod or an ellipse as it rotated slowly (5 rpm) in the frontoparallel plane. They reported seeing a sequence of percepts of the luminous stimulus starting with veridical rotation, then expansion-contraction, and/or advance-retreat and finally ending with apparent rotation in a plane oblique to O. The percepts were the same with either monocular or binocular regard and with the head tilted 90° to the side. In the latter case, the apparent plane of rotation shifted with the head position showing that the visual field determined the effect. This stereo-kinetic effect was related to the vertical-horizontal illusion and was explained in terms of the asymmetry of the visual field.

Perception of Depth in Rotating Objects: 3. Asymmetry and Velocity as the Determinants of the Stereokinetic Effect

1968 ◽  
Vol 26 (3) ◽  
pp. 671-681 ◽  
Author(s):  
Betty A. Wieland ◽  
Roy B. Mefferd
Keyword(s):  
Internal Structure ◽  
Horizontal Axis ◽  
Apparent Depth ◽  
Frontoparallel Plane ◽  
Stereokinetic Effect ◽  
Rotating Objects

When a flat stimulus is rotated in the frontoparallel plane about a horizontal axis that is an extension of O's line of regard, the apparent depth of the stimulus is enhanced. The enhancement was entirely a function of peripheral asymmetry. The apparent depth in the static figure, internal structure, or taper in the periphery did not augment the rotation-enhanced depth. The magnitude of the enhancement was constant for any series of stimuli, such as a series of overlapping circles with increasing overlap. The apparent depth also increased as a function of the speed of rotation.

Planning to Binge: How Consumers Choose to Allocate Media Viewing Time

2019 ◽  
Author(s):  
Joy Lu ◽  
Uma Karmarkar ◽  
Vinod Venkatraman
Keyword(s):  
Viewing Time

scholarly journals More human than human: a Turing test for photographed faces

2019 ◽  
Vol 4 (1) ◽  
Author(s):  
Jet Gabrielle Sanders ◽  
Yoshiyuki Ueda ◽  
Sakiko Yoshikawa ◽  
Rob Jenkins
Keyword(s):  
Social Context ◽  
Personal Identity ◽  
Error Rate ◽  
Turing Test ◽  
Perceptual Task ◽  
Viewing Time ◽  
Facial Appearance ◽  
Theoretical Interest ◽  
Significant Performance ◽  
Recent Experimental Work

Abstract Background Recent experimental work has shown that hyper-realistic face masks can pass for real faces during live viewing. However, live viewing embeds the perceptual task (mask detection) in a powerful social context that may influence respondents’ behaviour. To remove this social context, we assessed viewers’ ability to distinguish photos of hyper-realistic masks from photos of real faces in a computerised two-alternative forced choice (2AFC) procedure. Results In experiment 1 (N = 120), we observed an error rate of 33% when viewing time was restricted to 500 ms. In experiment 2 (N = 120), we observed an error rate of 20% when viewing time was unlimited. In both experiments we saw a significant performance cost for other-race comparisons relative to own-race comparisons. Conclusions We conclude that viewers could not reliably distinguish hyper-realistic face masks from real faces in photographic presentations. As well as its theoretical interest, failure to detect synthetic faces has important implications for security and crime prevention, which often rely on facial appearance and personal identity being related.

scholarly journals Pornography: How Does the Boomer Generation and Older Predict Others’ Viewing Time?

2020 ◽  
Vol 4 (Supplement_1) ◽  
pp. 311-312
Author(s):  
Katie Sakel ◽  
Joshua Grubbs
Keyword(s):  
Longitudinal Studies ◽  
Sexual Behaviors ◽  
Viewing Time ◽  
Web Based ◽  
Initial Exposure ◽  
Baby Boomer Generation ◽  
Participant Gender ◽  
Online Pornography ◽  
Nationally Representative ◽  
Average Woman

Abstract The increase of exposure to online pornography has decreased the age of initial exposure to pornography. However, very little is known about the outcomes resulting from increased pornography exposure in the Baby Boomer generation and beyond. The current study asked what predictors were significant in individuals born in 1965 and earlier when predicting the perceived pornography viewing time for the average man and woman. To answer this question, a nationally representative population (N = 1073, 510 males) completed a web-based survey measuring the age of the participant, gender of the participant, self-directed sexual behaviors (“How frequently have you masturbated while viewing pornography alone?”), partner-directed sexual behaviors (“How frequently have you viewed pornography with a partner?”), a religiosity index (“How important is your religion?”), and the predicted perceived time that a woman and man watches pornography, Results showed that perceived time that the average man spent viewing pornography was significantly predicted by age of the participant, gender of the participant, self-motivated sexual behaviors and partner-motivated sexual behaviors. Religiosity was not a significant predictor. In the regression predicting perceived time that the average woman viewed pornography were age of the participant, self-motivated sexual behaviors, and partner-motivated sexual behaviors. Gender of the participant and religiosity of the participant were not significant predictors. Further research should expand this work to a lifespan perspective and longitudinal studies.

What Hinders Accurate Depiction of Projective Shape?

Perception ◽  
1995 ◽  
Vol 24 (9) ◽  
pp. 995-1010 ◽  
Author(s):  
Emiel Reith ◽  
Chang Hong Liu
Keyword(s):  
Da Vinci ◽  
The Other ◽  
Frontoparallel Plane ◽  
Glass Pane ◽  
Drawing Task ◽  
Visual Projection ◽  
Vertical Glass ◽  
Perceptual Abilities ◽  
Improved Accuracy ◽  
Projective Shape

Adult subjects drew the visual projection of two models. One model was a trapezoid placed in the frontoparallel plane. The other was a tilted rectangle which displayed the same projective shape on a frontoparallel plane as the trapezoid. The drawing conditions were varied in two ways: the model remained available for inspection during the drawing task or it was masked after initial inspection; the subjects drew on paper placed flat on the table or on a vertical glass pane placed in front of the model (ie on a da Vinci window). The results were that (i) the projective shape of the frontoparallel trapezoid was reproduced accurately whereas that of the tilted rectangle was systematically distorted in the direction of its actual physical dimensions; (ii) when subjects drew on paper, the presence or absence of a view of the model made no difference to the amount of distortion; (iii) drawing on a da Vinci window improved accuracy even when the model was hidden. These findings provide information about the relative roles of object-centred knowledge, perceptual abilities, and depiction skills in drawing performance.

Sign in / Sign up

Export Citation Format

Share Document