Temporal dynamics of the Venetian blind effect
| Autor: | Wm Wren Stine, Joshua J Dobias |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
genetic structures
media_common.quotation_subject education Motion Perception Grating Luminance Contrast Sensitivity Motion-in-depth fluids and secretions Optics Discrimination Psychological Perception parasitic diseases Contrast (vision) Humans Temporal dynamics Stereopsis Contrast disparity Lighting media_common Venetian blind effect Depth Perception business.industry Optical Illusions Vertical axis Irradiation stereoscopy Sensory Systems body regions Ophthalmology Dynamics (music) Sensory Thresholds Luminance disparity Depth perception business Photic Stimulation |
| Zdroj: | Vision Research. 60:79-94 |
| ISSN: | 0042-6989 |
| DOI: | 10.1016/j.visres.2012.02.013 |
| Popis: | When square wave gratings are viewed binocularly with lower luminance or contrast in one eye, the individual bars of the grating appear to rotate around a vertical axis (Venetian blind effect). The effect has typically been thought to occur due to retinal disparities that result from irradiation and, therefore, are entirely entoptic. If so, the visual system should process disparities from a luminance or contrast disparity and a geometric disparity at the same rate. Studies of motion-in-depth using geometric disparities have shown that the visual system is unable to process depth cues when those cues are oscillated at frequencies greater than 5 Hz. By changing contrast (experiments one and two) and geometric (experiment three) disparity cues over time, the present study measured the frequency at which both the perception of motion-in-depth and the perception of depth diminish. The perception of motion-in-depth from contrast disparities decreased near 1.1 Hz (experiments one and four) and the perception of depth from contrast disparities decreased near 1.3 Hz (experiments one, two and four); both of which are lower than the frequency where depth from a geometric disparity diminished (near 4.8 Hz in experiment three). The differences between the dynamics of depth from contrast and geometric disparities suggest that the perception arises from separate neural mechanisms. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect