Die stereoskopischen Erscheinungen in ihrer Beziehung zu der Lehre von den identischen Netzhautpunkten

Volkmann, Armin

doi:10.1007/bf02720766

Cited by 17 publications

(7 citation statements)

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“…In line with previous research (Brecher, 1942; Lyding, 1939; Rosch, 1943 as cited in Mitchell, 1966; Volkmann, 1859), we see smaller fusion limits for vertical disparities compared with measurements at the same locations for horizontal disparities shown in Experiment 1, with vertical fusion limits being approximately half of those reported for participants in Experiment 1. There is evidence of individual differences both in the size of Panum’s fusional range, which is consistent with the findings in Experiment 1, and general consensus that measurements of Panum’s fusional range differ between observers (Grove & Harrold, 2013; Harrold & Grove, 2015; Ogle, 1952).…”

Section: Discussionsupporting

confidence: 92%

“…The data show that Panum’s fusional range for vertical disparities significantly increases over the range of eccentricities tested but with no change in fusion limits across separation at each eccentricity. Consistent with previous findings (Brecher, 1942; Lyding, 1939; Rosch, 1943 as cited in Mitchell, 1966; Panum, 1858; Volkmann,1859), the size of Panum’s fusional range for vertical disparities is smaller than the range for horizontal disparities for the same eccentricities. Interestingly, at each eccentricity, Panum’s fusional range for vertical disparities is roughly half of the range for horizontal disparities at the same eccentricity.…”

Section: Discussionsupporting

confidence: 89%

“…Although Panum’s fusional range for horizontal disparities has been well documented, the corresponding range for vertical disparities has not been studied as extensively. Panum (1858) originally reported that the fusional range for vertical disparities is smaller than for horizontal disparities, and subsequent studies support this claim though measurements are mostly limited to a single eccentricity close to fixation (<2° eccentricity; Brecher, 1942; Ogle & Prangen, 1953; Volkmann, 1859). Therefore, it is an open question as to whether Panum’s range for vertical disparities increases with eccentricity or separation (but see Lyding, 1939).…”

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confidence: 96%

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Size Increase in Panum’s Fusional Range Is Driven by Eccentricity and Not Separation

Harrold

Grove

2019

Perception

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Previous research has demonstrated that Panum’s fusional range increases in the periphery, and this increase is usually attributed to eccentricity. However, it is unclear whether the increase in the periphery is driven by eccentricity or separation between the stimulus and the central fixation marker. In Experiment 1, we independently measured the effects of eccentricity and stimulus separation on Panum’s fusional range for horizontal disparities. We observed significant increases in Panum’s range as eccentricity increased independently of stimulus separation. Experiment 2 revealed that the extent of Panum’s fusional range for vertical disparities increased with eccentricity independently of stimulus separation. Taken together, these results strongly support previously held conclusions that Panum’s fusional range for both horizontal and vertical disparities increases with increasing eccentricity and is little impacted by stimulus separation.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 89%

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confidence: 96%

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Size Increase in Panum’s Fusional Range Is Driven by Eccentricity and Not Separation

Harrold

Grove

2019

Perception

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“…Helmholtz proposed that the vertical horopter is a tilted line passing through the observer's fixation point and his feet 23 . Subsequent investigators rejected the results of Helmholtz 23 and Volkman 24 as being due to idiosyncratic excyclotorsion of Helmholtz and Volkman's own eyes about the anterior posterior axis. Instead, they implied that the vertical horopter was fronto parallel.…”

Section: Ocular Torsion and The Vertical Horopter In Humansmentioning

confidence: 99%

Gillies Lecture: comparative anatomy of V esotropia

Molteno

Bevin

2005

Clinical Exper Ophthalmology

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“…Alfred Wilhelm Volkmann 1 (1801-1877) presented his theoretical and experimental response to Wheatstone's 2 (1838) analysis of binocular vision in 1859. The impact of Wheatstone's stereoscopic investigations on German visual science was seismic.…”

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confidence: 99%

Alfred Wilhelm Volkmann on stereoscopic vision

Wade

2022

Strabismus

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Wheatstone's demonstration of binocular single vision and depth with stimulation of noncorresponding points reverberated throughout mid-nineteenth century German visual science. It challenged the received view that single vision was a consequence of retinal correspondence otherwise objects were seen double. Wheatstone also argued that stimulation of corresponding points could yield double vision. He interpreted his experimental observations in psychological rather than physiological terms, as did Helmholtz later. Volkmann addressed both of these challenges in a long article on stereoscopic vision published in 1859. While he accepted the first of the questions Wheatstone posed Volkmann was more cautious with regard to the second. Volkmann was an experimentalist who applied psychophysical methods to determine thresholds for stereoscopic depth perception. In line with many of his colleagues in Germany, he took issue implicitly with Wheatstone's approach: how can the detailed quantitative experiments supporting Vieth and Müller's interpretation of binocular single vision be derailed by simple observations with a stereoscope? Unlike most of his colleagues, Volkmann was swayed in Wheatstone's favor through his own experiments: both physiological and psychological processes are involved in stereoscopic depth perception.

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Die stereoskopischen Erscheinungen in ihrer Beziehung zu der Lehre von den identischen Netzhautpunkten

Cited by 17 publications

References 0 publications

Size Increase in Panum’s Fusional Range Is Driven by Eccentricity and Not Separation

Size Increase in Panum’s Fusional Range Is Driven by Eccentricity and Not Separation

Gillies Lecture: comparative anatomy of V esotropia

Alfred Wilhelm Volkmann on stereoscopic vision

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