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In 1993 Merfeld et al. [77], using a modelling approach in accordance with Luenberger’s the- ory [67], proposed a non-linear one-dimensional model of the human perception of spatial orienta- tion. The construction of the Merfeld’s model [77] was based on the concept illustrated in Figure 1. According to this concept, the model of spatial ori- entation perception is divided into two parts: the model of the physical world and the CNS model, that is represented by so-called internal model. The model of the physical world describes the dynamics of physical sensors (three semicircular canals and two otolith organs), while the internal  model represents the sensory signals processing in the CNS.

Figure 1 In 1993 Merfeld et al. [77], using a modelling approach in accordance with Luenberger’s the- ory [67], proposed a non-linear one-dimensional model of the human perception of spatial orienta- tion. The construction of the Merfeld’s model [77] was based on the concept illustrated in Figure 1. According to this concept, the model of spatial ori- entation perception is divided into two parts: the model of the physical world and the CNS model, that is represented by so-called internal model. The model of the physical world describes the dynamics of physical sensors (three semicircular canals and two otolith organs), while the internal model represents the sensory signals processing in the CNS.