Editing Beta movement

{{Use dmy dates|date=August 2022}}
[[File:Beta movement.gif|150px|thumb|Example of the beta movement effect|alt=a diagram of LEDs turning on and off, making the pattern of a snake]]
The term '''beta movement''' is used for the [[optical illusion]] of [[illusory motion|apparent motion]] in which the very short projection of one figure and a subsequent very short projection of a more or less similar figure in a different location are experienced as one figure moving.

The illusion of motion caused by [[animation]] and [[film]] is sometimes believed to rely on beta movement, as an alternative to the older explanation known as [[persistence of vision]]. However, the human visual system can't distinguish between the short-range apparent motion of film and real motion, while the long-range apparent motion of beta movement is recognised as different and processed in a different way.<ref name=Anderson1993>{{cite journal
 | title = The Myth of Persistence of Vision Revisited
 |author1=Anderson, Joseph |author2=Anderson, Barbara | year = 1993
 | journal = Journal of Film and Video
 | volume = 45
 | issue = 1
 |pages=3–12 | jstor = 20687993}}</ref>

[[File:Canary Wharf news ticker.jpg|thumb|Canary Wharf news ticker]]

==History==
Observations of apparent motion through quick succession of images go back to the 19th century. In 1833, [[Joseph Plateau]] introduced what became known as the [[phenakistiscope]],<ref>{{Citation |last=Lipton |first=Lenny |title=Plateau Invents the Phenakistoscope |date=2021 |url=https://doi.org/10.1007/978-1-0716-0951-4_4 |work=The Cinema in Flux: The Evolution of Motion Picture Technology from the Magic Lantern to the Digital Era |pages=43–50 |editor-last=Lipton |editor-first=Lenny |access-date=2023-09-22 |place=New York, NY |publisher=Springer US |language=en |doi=10.1007/978-1-0716-0951-4_4 |isbn=978-1-0716-0951-4|url-access=subscription }}</ref> an early animation device based on a [[stroboscopic effect]]. The principle of this "philosophical toy" would inspire the development of cinematography at the end of the century. Most authors who have since described the illusion of seeing motion in the fast succession of stationary images,<ref>{{Cite journal |last1=Anderson |first1=Joseph |last2=Fisher |first2=Barbara |date=1978 |title=The Myth of Persistence of Vision |url=https://www.jstor.org/stable/20687445 |journal=Journal of the University Film Association |volume=30 |issue=4 |pages=3–8 |jstor=20687445 |issn=0041-9311}}</ref> maintained that the effect is due to [[persistence of vision]], either in the form of afterimages on the retina or with a mental process filling in the intervals between the images.<ref name=Anderson1993/>

In 1875, [[Sigmund Exner]] showed that, under the right conditions, people will see two quick, spatially separated but stationary electrical sparks as a single light moving from place to place, while quicker flashes were interpreted as motion between two stationary lights. Exner argued that the impression of the moving light was a perception (from a mental process) and the motion between the stationary lights as pure [[sense]].<ref>{{cite journal|first=Sigmund|last=Exner|title=Über das Sehen von Bewegungen und die Theorie des zusammengesetzten Auges in |journal = Sitzungsberichte der Mathematisch-Naturwissenschaftlichen Classe der Kaiserlichen Akademie der Wissenschaften. V.71-72|year=1875|pages=363|url=https://babel.hathitrust.org/cgi/pt?id=coo.31924063807345&view=1up&seq=156|access-date=2020-12-12|via=HathiTrust|language=en}}</ref>

In 1912, [[Max Wertheimer]] wrote an influential article that would lead to the foundation of [[Gestalt psychology]]. In the discussed experiments, he asked test subjects what they saw when viewing successive [[tachistoscope]] projections of two similar shapes at two alternating locations on a screen. The results differed depending on the frequency of the flashes of the tachistoscope. At low frequencies, successive appearances of similar figures at different spots were perceived. At medium frequencies, it seemed like one figure moved from one position to the following position, regarded as "optimale Bewegung" (optimal motion) by Wertheimer. No shape was seen in between the two locations. At higher speeds, when test subjects believed to see both of the fast blinking figures more or less simultaneously, a moving objectless phenomenon was seen between and around the projected figures. Wertheimer used the Greek letter φ (phi) to designate illusions of motion and thought of the high-frequency objectless illusion as a "pure [[phi phenomenon]]", which he supposed was a more direct sensory experience of motion.<ref>{{Cite journal
| volume = 61
| pages = 161–265
| last = Wertheimer
| first = Max
| title = Experimentelle Studien über das Sehen von Bewegung
| language = de
| trans-title = Experimental studies on the seeing of motion
| journal = Zeitschrift für Psychologie
| year = 1912
| url = http://gestalttheory.net/download/Wertheimer1912_Sehen_von_Bewegung.pdf
| access-date = 28 October 2019
| archive-date = 23 November 2018
| archive-url = https://web.archive.org/web/20181123195512/http://gestalttheory.net/download/Wertheimer1912_Sehen_von_Bewegung.pdf
| url-status = dead
}} Available in translation as {{Cite book
| publisher = MIT
| editor-first = Lothar
| editor-last = Spillman
| last = Wertheimer
| first = Max
| others = Michael Wertheimer, K. W. Watkins (trans.)
| title = On Perceived Motion and Figural Organization
| chapter = Experimental Studies on Seeing Motion
| location = Cambridge, MA
| access-date = 15 October 2019
| date = 2012
| chapter-url = http://cognet.mit.edu/book/perceived-motion-and-figural-organization
}}</ref> Wertheimer's work became famous due to his demonstrations of the phi phenomenon, while the optimal motion illusion was regarded as the phenomenon well-known from movies.<ref name=Steinman2000>{{Cite journal| doi = 10.1016/s0042-6989(00)00086-9| issn = 0042-6989| volume = 40| issue = 17| pages = 2257–2264| last1 = Steinman| first1 = R. M.| last2 = Pizlo| first2 = Z.| last3 = Pizlo| first3 = F. J.| title = Phi is not beta, and why Wertheimer's discovery launched the Gestalt revolution| journal = Vision Research|year = 2000| pmid = 10927113| doi-access = free}}</ref>

In 1913, Friedrich Kenkel defined different types of the motion illusions found in the experiments of Wertheimer and subsequent experiments by [[Kurt Koffka]] (who had been one of Wertheimer's test subjects). Kenkel, a co-worker of Koffka, gave the optimal illusion of motion (with the appearance of one figure moving from one place to the next) the designation "β-Bewegung" (beta movement).<ref>{{cite journal|first=Friedrich|last= Kenkel|title=Untersuchungen über den Zusammenhang zwischen Erscheinungsgröße und Erscheinungsbewegung bei einigen sogenannten optischen Täuschungen|year=1913|journal=Zeitschrift für Psychologie.| volume= 67 |url=https://archive.org/details/zeitschrift-fur-psychologie-67.1913/page/360/mode/1up}}</ref>

==Confusion about phi phenomenon and beta movement==
Wertheimer's pure [[phi phenomenon]] and beta movement are often confused in explanations of film and animation,<ref name="Steinman2000"/><ref>{{Cite book |last=Blassnigg |first=Martha |url=https://books.google.com/books?id=6ziyB1pa-78C&dq=beta%20movement%20movie&pg=PA126 |title=Time, Memory, Consciousness and the Cinema Experience: Revisiting Ideas on Matter and Spirit |date=March 2010 |publisher=Rodopi |isbn=978-90-420-2641-4 |language=en}}</ref> but they are quite different perceptually and neither really explains the short-range apparent motion seen in film.<ref name=Anderson1993/>

In beta movement, two stimuli, <math>a</math> and <math>b</math>, appear in succession, but are perceived as the motion of a single object, <math>a</math>, into position <math>b</math>. In phi movement, the two stimuli <math>a</math> and <math>b</math> appear in succession, but are perceived as the motion of a vague shadowy something passing over <math>a</math> and <math>b</math>. There are many factors that determine whether one will experience beta movement or the phi phenomenon in a particular circumstance. They include the luminance of the stimuli in contrast to the background, the size of the stimuli, how far apart they are, how long each one is displayed, and precisely how much time passes between them (or the extent to which they overlap in time).<ref name=Steinman2000 />

==See also==
*[[Ternus illusion]]
*[[Phi phenomenon]]
*[[Stroboscopic effect]]
*[[Apparent motion (disambiguation)|Apparent motion]]
*[[Persistence of vision]]

==References==
{{reflist}}

[[Category:1833 introductions]]
[[Category:Optical illusions]]