doc. Mgr. Radovan Šikl, Ph.D.

doc. Mgr. Radovan Šikl, Ph.D.

Institute of Psychology
The Czech Academy of Sciences
Veveří 97, 602 00 Brno
Tel.: +420 532 290 129


1996–2001 Ph.D. Psychology, Masaryk University, Brno

1989–1994 M.A. Psychology, Masaryk University, Brno

Professional experience

2003–present Head of the Department of Cognitive Psychology, Institute of Psychology ASCR

1996–present Researcher at Institute of Psychology ASCR

Scientific-organizational activities

2015–present Czech Science Foundation, Member of the Evaluation P407 - Psychology, pedagogy; vice-chairman since 2016

2007–2012 Member of the Institutional Board of the Institute of Psychology ASCR


Visual space perception

As a part of our visual space perception research, we conducted numerous experiments addressing mainly methodological issues. In one of our research project, we argue that the descriptors of visual space, such as exocentric size, egocentric distance, and exocentric direction, which are typically investigated independent of one another, are in fact inherently related. In another line of research, we compare the observersperceptual performance in three experiments with changing metrics of the requested response (judgments of ordinal, ratio, and absolute depth) and investigate whether with increased level of description of depth, the performance is decreasing accordingly. Publications [1], [3], [8], [12], [15], [21].

11.jpg 12.jpg 13.jpg

Visual perception after a long-term sensory deprivation

We examine the specifics of visual perception on the patients who, after a long period of blindness or visual deprivation, underwent a successful sight-restoring operation (artificial cornea implant, miniature telescope implant). For those patients, the perceptual domains that are particularly afflicted are object and face recognition, visual space perception, and a lower level of visual processing (i.e., perceptual organization). We hypothesize that their perceptual performance may be negatively affected by underlying problems with holistic processing of visual stimuli and by the decreased flexibility and robustness of perceptual representation, especially if the deprivation period was extremely long. On the other hand, the domains of color perception and motion perception appear to be largely intact. On the basis of our empirical findings, we try to design targeted training and rehabilitation routines for sight-recovery patients. Publications [1], [5], [6].

21.jpg 22.jpg 23.jpg

Confinement and its effect on visual perception

We had the opportunity to longitudinally investigate the perceptual performance of the volunteers participating in the Mars-500 project (, an isolation study that simulated a flight to Mars. The crewmembers spent 520 days in a sealed facility that was designed to resemble a spacecraft. From the list of potential stressors to which the crewmembers were exposed, we hypothesized that (i) the confinement to a restricted area and (ii) perceptual monotony are the most important factors potentially influencing the crewmembersvisual performance and we aimed our research to monitor how it changed throughout the confinement. Specifically, we expected changes (i) in the crewmembers sensitivity to perspective information and (ii) in the flexibility of perceptual representations. Publications [1], [4], [9].

31.jpg 32.jpg 33.jpg

Depth perception in architecture

An observer resolves the ambiguity of the retinal image so that s/he selects the simplest (simplicity principle) and the most probable (likelihood principle) interpretation consistent with the image. It is interesting to observe how is this inclination addressed in the work of architects. Using various kinds of manipulations in perspective, proportions, figure-ground relationship and lighting, the architects can easily elicit the perception that does not strictly correspond to the actual structure of the observed objects (buildings, streets, gardens). The reason for utilizing these manipulations is not simple deceiving the observer’s eyes, but rather the aim to strenghten artistic or spiritual impression or to offer a new way of objects’ interpretation. Publication [22].

41.jpg 42.jpg

Visual illusions

Vida! science center in Brno, Czech Republic holds an exhibition titled Illusiorium [Klamárium] from November 1, 2016 to May 9, 2017. The exhibition covering the area of 500 square meters consists of 30 well-known and lesser-known visual illusions chosen to demonstrate selected fundamental principles of human visual perception. There is an explanation provided for each exhibit: one rather short and simple (on the panel next to the exhibit) and one much longer (provided on a tear-off or in the catalog) for those who would like a fuller explanation. The exhibition is divided into five different rooms. In each of them, the visitor will become familiar with different aspects of human perception. Homepage:

51.jpg 52.jpg 53.jpg



[1] Šikl, R. (2012). Zrakové vnímání. Praha: Grada. ukázka .pdf recenze recenze2

Book translations

[2] Eysenck, M. J. & Keane, M. T. (2008). Kognitivní psychologie. Praha: Academia (editor of the translation).

Peer-reviewed journal articles

[3] Šikl, R. & Šimeček, M. (2015). Visual space perception at different levels of depth description. Attention, Perception & Psychophysics, 77, 6, 2098–2107. PDF
[4] Šikl, R. & Šimeček, M. (2014). Confinement has no effect on visual space perception. The results of the Mars-500 experiment. Attention, Perception & Psychophysics, 76, 2, 438–451. PDF

[5] Šikl, R., Šimeček, M., Porubanová, M., Bezdíček, O., Kremláček, J., Stodůlka, P., Fine, I. & Ostrovsky, Y. (2013). Vision after 53 years of blindness. i-Perception. PDF

[6] Kremláček J., Šikl, R., Kuba, M., Szanyi, J., Kubová, Z., Langrová, J., Vít, F., Šimeček, M. & Stodůlka, P. (2013). Cognitive processing of visual oddballs spared in patient with partial recovery of vision after 53 years of blindness. Vision Research, 81, 1–5. PDF

[7] Porubanová, M. & Šikl, R. (2013). Various categories of changes in the inducement of change blindness. Studia Psychologica, 55, 2, 83–94.

[8] Šikl, R. & Šimeček, M. (2011). Perceived size and perceived direction: The interplay of the two descriptors of visual space. Perception, 40, 953–961.

Peer-reviewed journal articles in Czech

[9] Šimeček M. & Šikl R. (2013). Dlouhodobá izolace a její vliv na zrakové vnímání: Výsledky projektu Mars-500. Československá psychologie, 57, 4, 342–357.

[10] Šikl, R. (2010). Richard Langton Gregory (1923–2010). Československá psychologie, 54, 6, 613–614.

[11] Šikl, R. (2008). O nedokonalosti a omylnosti zrakového vnímání. Československá psychologie, 52, 3, 318–323.

[12] Šimeček, M. & Šikl, R. (2005). Větší nebo menší? Vnímání velikosti řazením. Československá psychologie, 49, 6, 505–523.

[13] Šikl, R. (2004). Alhazen (965–1039): jeho dílo v kontextu starověké a středověké optiky. Československá psychologie, 48, 4, 364–377.

[14] Šikl, R. (2003). Eleanor Gibsonová (*7.12.1910 – +30.12.2002). Československá psychologie, 47, 2, 169–172.

[15] Šikl, R. & Šimeček, M. (2002). Rozměr a orientace: spojité nádoby percepčního hodnocení prostoru. Československá psychologie, 46, 6, 490–508.

[16] Šikl, R. (2001). Hermann von Helmholtz (1821–1894) o vnímání. Československá psychologie, 45, 2, 166–178.

[17] Šikl, R. & Čermák, I. (2000). "Common sense" a psychologické teorie. Československá psychologie, 44, 5, 444–450.

[18] Šikl, R. (1998). Vnímání struktury pohybujících se objektů. Československá psychologie, 42, 245–259.

[19] Šikl, R. & Kouřilová, J. (1996). Obranné tendence v atribuci. Československá psychologie, 40, 4, 315–320.

[20] Čermák, I. & Šikl, R. (1996). Psychologie a "common sense". Československá psychologie, 40, 1, 46–54.

Book chapters

[21] Šimeček, M. & Šikl, R. (2014). Za pochopením zrakového vnímání prostoru. In: Blatný, M. (ed.). Člověk v kontextech celoživotního vývoje. Brno: PsÚ (pp. 187-200).

[22] Šimeček, M. & Šikl, R. (2010). Klamání oka v architektuře. Kdo koho klame? A klame vůbec? In Miovský M., Čermák I. & Chrz V. (Eds.). Umění ve vědě, věda v umění. Praha: Grada (pp. 209–229).

[23] Šimeček, M. & Šikl, R. (2010). Jak a proč vznikají zrakové klamy. In Kvasnička V., Pospíchal J., Návrat P., Lacko P., Trebatický P. (Eds.). Umelá inteligencia a kognitívna veda II. STU Bratislava (pp. 467–522).

[24] Šikl, R. & Šimeček, M. (2009). Co vědí o vnímání povolání. In Petrů, M. (ed.). Struny mysli. Ostrava: Montanex (pp. 117–122).

[25] Šimeček, M. & Šikl, R. (2009). Směr v prostorovém vnímání. In Petrů, M. (ed.) Struny mysli. Ostrava, Montanex (pp. 123–131).

[26] Šikl, R. (2008). Vnímání z pozic konstruktivismu a enaktivního přístupu. In Kvasnička, V., Kelemen, J. & Pospíchal, J. (Eds.). Modely mysle. Bratislava: Europa (pp. 215–228).

Organizational activities

2009–2014 Winter school of cognitive psychology

2006 Interdisciplinary conference Cognition

2011 Interdisciplinary conference Cognitiion

2011 Interdisciplinary workshop Depth perception


Principle investigator

2012–2013 "Longitudinal study of visual perception of sight-recovery patients after a long-term sensory deprivation", Grant project GA ČR P407/12/2528

2009–2012 "Perception and Memory Changes during Long-term Isolation", Grant project GA ČR 406/09/2003

2007–2009 "Selected aspects of the relationship between physical and visual space", Grant project GA ČR 406/07/167

2003–2005 "Visual perception of near space", Grant project GA ČR 406/03/D224

2000–2001 "Perceiving the structure of moving objects", Grant project GA ČR 406/00/0846

Co-principle investigator

2013–2015 "Prostorové vnímání fotografických scén", Grant project GA ČR 407–28709S

Courses taught

Psychology of visual perception (Institute of Psychology, Faculty of Arts, Masaryk University, Brno)

Discussion on current topics of cognitive psychology (Institute of Psychology, Faculty of Arts, Masaryk University, Brno)