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3D Models of 6dof Motion
No full textThis repository contains a 3d model (head_6dof.blend) visualizing motions with 6 degrees of freedom. For the head we use a 3D model created with make human under the CC BY-SA 3.0 license. All body parts but the head were removed from the model used. The main model contains the head, all planes, axes, and labels. Examples of rendered images and an animation are included.The model was created with Blender.
Nomenclature
Names of the axes and planes according to Bremova et al., 2016:
Abreviation
Axis
IA
inter-aural
HV
head-vertical
NO
naso-occipital
Colors
Colors are taken from the Bang Wong color palette which is designed to be accessible to people who are colorblind.
Axis
Color
RGB
IA
bluish green
000,158,115
HV
blue
000,114,178
NO
vermillion
213,094,000
roll
reddish purple
204,121,167
pitch
orange
230,159,000
yaw
sky blue
086,180,23
3D Models of 6of Motion
No full textThis repository contains a 3d model (head_6dof.blend) visualizing motions with 6 degrees of freedom. For the head we use a 3D model created with make human under the CC BY-SA 3.0 license. All body parts but the head were removed from the model used. The main model contains the head, all planes, axes, and labels. Examples of rendered images and an animation are included. The model was created with Blender
PlatformCommander — An open source software for an easy integration of motion platforms in research laboratories
No full textMotion platforms are used to study human behavior and brain function during passive motions. The software for controlling motion platforms is typically developed by the respective laboratories. Such customized, closed source solutions make replications of studies or multi-center collaborations difficult. Therefore, we developed PlatformCommander, an open-source software package for interfacing two often used motion platform models (6DOF2000E., MB-E-6DOF). The software includes a server implementing the interaction with the motion platform and additional devices, and a client application, connecting to the server and controlling experiments. PlatformCommander is ideal for the synchronization of data from different sources with high temporal precision
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Influence of magnetic vestibular stimulation on self-motion perception
Get PDFUltrahigh magnetic fields (UHF) induce dizziness, vertigo and nystagmus due to Lorentz forces acting on the cupula in the semi-circular canals, an effect called magnetic vestibular stimulation (MVS) (Roberts et al., 2011; Ward et al., 2015). As the effect of the magnetic field on the cupula remains constant throughout the exposure, MVS is specifically suitable for studying cognitive performance under vestibular stimulation. The effect of MVS can be set near to zero by tilting the head 30° forward towards the body, allowing to compare different strengths of MVS within subjects (Mian et al., 2016). Furthermore, MVS serves as a suitable non-invasive model for unilateral failure of the vestibular system, which enables studying compensatory processes (Ertl and Boegle, 2019). We conducted our study in a Siemens Terra 7 Tesla Scanner and tested 8 young, healthy participants and plan to include 30 more.
The study had two main goals. First, to investigate the process of perception-reflex uncoupling, as under MVS self-motion perception differs from measured nystagmus in direction as well as time course. While horizontal nystagmus was predominant, most participants report a percept of roll rotation, and less frequent a percept of yaw rotation or a mixture of both when moving in to and out of the magnetic field. This matches previous studies (Mian et al., 2013). Reported percepts did not correspond fully to measured reflexive eye-movements. Overall, stronger nystagmus indicated stronger percepts. Roll percepts make sense because the brain integrates the prior knowledge and sensory evidence. In supine position, yaw but not roll rotation would also elicit change in direction of gravity. Second, to quantify influence of continuous vestibular stimulation on cognitive functions with spatial components. Behavioral and neuroimaging studies have shown repeatedly that caloric, galvanic and motion platform-induced vestibular stimulation can affect performance in spatial tasks, such as mental rotation (Klaus et al., 2019; Falconer & Mast, 2012). The influence of MVS on spatial cognition is relevant for fMRI studies as MVS can be a confounder, especially in studies using UHFs. In our study, we did not find a meaningful effect of MVS on mental body rotation performance, neither in allocentric nor in egocentric strategy.
In the future, we aim to compare healthy participants and patients with vestibular disorders to investigate adaption and habituation mechanisms
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