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Cerebral laterality in birds and mammals, its behavioral correlation and evolutionary significance
Tureček, Petr ; Komárek, Stanislav (advisor) ; Němec, Pavel (referee)
Lateralization of brain is ubiquitous quality of vertebrate brain. In this paper we rewiev examples of brain lateralization in birds and mammals and it's behavioral impacts. Than we discuss possible evolutionary origins of these asymmetries and their evolutionary significance. We try to explain individual as well as population level lateralization. We propose, that population level lateralization can, in principle, arise just on the genofondal basis, if the organism itself contributes to the enviroment with the lateralized behavior. Lateralized sensory input on the other hand should stand on the advantages of synchronizing with other individuals due to the disatvantage of predictability of lateralized population. Keywords: Lateralization; laterality; population level lateralization; asymmetry; evolutionary significance
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Evolutionary aspects of (epi)genetic determination of laterality with a special focus on upper limb
Holoubková, Tereza ; Daňková, Pavlína (advisor) ; Struška, Michal (referee)
Handedness is one of the most distinct asymmetries of the human body. There is approximately 90 % of right-handers in the population, which is the strongest bias in handedness among all primates. Handedness is connected with lateralization of brain for language and is determined both genetically and by the environment. Genetic determination of the handedness has not been yet figured out, although there are many candidate genes and regions. In addition to candidate genes, the genetic determination is shaped by the epigenetic mechanisms and the role of testosterone. Handedness occurred alongside the beginning of the human population development, approximately in the Middle Pleistocene, with the same percentage of left-handers as today. Handedness polymorphism is maintained in the population based on the frequency-dependent model because of the advantages and disadvantages associated with left-handedness.
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Laterality in locomotory-rotational and social behaviour of mammals
Kunclová, Kristýna ; Špinka, Marek (advisor) ; Vlček, Kamil (referee)
Lateralization of brain structures manifesting behavioral laterality is a known phenomenon among vertebrates, and their equivalents are also found in invertebrates. In this paper, I will review motor laterality in mammals, which includes mainly preferential use of one limb/paw (Handedness) and spatial preferences in rotational behavior. In this work, I will summarize laterality of rotational behavior, as the most important part of my paper, within the larger scope of motor laterality. I will offer some explanations of laterality changes depending on the surrounding circumstances, and the emotional setting of individuals and present examples of laterality at the individual and population levels in mammals. Keywords: Lateralization, Motor laterality, rotational/turning asymmetries, Handedness, Forelimb preference, Individual laterality, Population laterality, Mammals
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Cerebral laterality in birds and mammals, its behavioral correlation and evolutionary significance
Tureček, Petr ; Komárek, Stanislav (advisor) ; Němec, Pavel (referee)
Lateralization of brain is ubiquitous quality of vertebrate brain. In this paper we rewiev examples of brain lateralization in birds and mammals and it's behavioral impacts. Than we discuss possible evolutionary origins of these asymmetries and their evolutionary significance. We try to explain individual as well as population level lateralization. We propose, that population level lateralization can, in principle, arise just on the genofondal basis, if the organism itself contributes to the enviroment with the lateralized behavior. Lateralized sensory input on the other hand should stand on the advantages of synchronizing with other individuals due to the disatvantage of predictability of lateralized population. Keywords: Lateralization; laterality; population level lateralization; asymmetry; evolutionary significance
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Cognitive predispositions affected by degree of brain masculinity and femininity
PIXA, David
This thesis is concerned with gender-related differences of cognitive predispositions. Findings could be utilized predominantly in human resource management, pedagogy and psychology. The research was proceeded as a case study of 45 undergraduate students. Individual degree of masculinity/femininity (gender) was indicated by the Minnesota Multiphasic Personality Inventory (MMPI), while cognitive preferences were measured and described by Hermann Brain Dominance Instrument (HBDI). Another data were obtained by means of qualitative research methods, such as participant observation and semi-structured interviews. Besides, in general features were surveyed hand-lateral-preference, professional orientation and attention capability. All probands were divided into 6 categories according to gender and degree of MF. Synthesis of MMPI and HBDI results showed significant congruence between the gender-categories and a dominant preference of the HBDI{\crq}s cognitive styles: Masculine men {--} a dominant preference of A-mode (analytical thinking). Feminine men {--} a dominant preference of D-mode (imaginative thinking). Masculine women {--} a dominant preference of B-mode (sequential thinking). Feminine women {--} a dominant preference of C-mode (interpersonal thinking). This findings were in accordance with a professional orientation of the probands (regardless of the field of study they have choosen). Right-brain dominant students (mostly feminine men) were not well-adjusted to a classical passive teaching metods.
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