Schaffelhofer, Stefan

[["dc.bibliographiccitation.firstpage","32124"],["dc.bibliographiccitation.issue","50"],["dc.bibliographiccitation.journal","Proceedings of the National Academy of Sciences"],["dc.bibliographiccitation.lastpage","32135"],["dc.bibliographiccitation.volume","117"],["dc.contributor.author","Michaels, Jonathan A."],["dc.contributor.author","Schaffelhofer, Stefan"],["dc.contributor.author","Agudelo-Toro, Andres"],["dc.contributor.author","Scherberger, Hansjörg"],["dc.date.accessioned","2021-04-14T08:25:57Z"],["dc.date.available","2021-04-14T08:25:57Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1073/pnas.2005087117"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/81778"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","1091-6490"],["dc.relation.issn","0027-8424"],["dc.title","A goal-driven modular neural network predicts parietofrontal neural dynamics during grasping"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1068"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","The Journal of neuroscience"],["dc.bibliographiccitation.lastpage","1081"],["dc.bibliographiccitation.volume","35"],["dc.contributor.author","Schaffelhofer, Stefan"],["dc.contributor.author","Agudelo-Toro, Andres"],["dc.contributor.author","Scherberger, Hansjörg"],["dc.date.accessioned","2017-09-07T11:53:55Z"],["dc.date.available","2017-09-07T11:53:55Z"],["dc.date.issued","2015"],["dc.description.abstract","Despite recent advances in decoding cortical activity for motor control, the development of hand prosthetics remains a major challenge. To reduce the complexity of such applications, higher cortical areas that also represent motor plans rather than just the individual movements might be advantageous. We investigated the decoding of many grip types using spiking activity from the anterior intraparietal (AIP), ventral premotor (F5), and primary motor (M1) cortices. Two rhesus monkeys were trained to grasp 50 objects in a delayed task while hand kinematics and spiking activity from six implanted electrode arrays (total of 192 electrodes) were recorded. Offline, we determined 20 grip types from the kinematic data and decoded these hand configurations and the grasped objects with a simple Bayesian classifier. When decoding from AIP, F5, and M1 combined, the mean accuracy was 50% (using planning activity) and 62% (during motor execution) for predicting the 50 objects (chance level, 2%) and substantially larger when predicting the 20 grip types (planning, 74%; execution, 86%; chance level, 5%). When decoding from individual arrays, objects and grip types could be predicted well during movement planning from AIP (medial array) and F5 (lateral array), whereas M1 predictions were poor. In contrast, predictions during movement execution were best from M1, whereas F5 performed only slightly worse. These results demonstrate for the first time that a large number of grip types can be decoded from higher cortical areas during movement preparation and execution, which could be relevant for future neuroprosthetic devices that decode motor plans."],["dc.identifier.doi","10.1523/jneurosci.3594-14.2015"],["dc.identifier.gro","3151409"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/8208"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","0270-6474"],["dc.title","Decoding a Wide Range of Hand Configurations from Macaque Motor, Premotor, and Parietal Cortices"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","Frontiers in Behavioral Neuroscience"],["dc.bibliographiccitation.volume","15"],["dc.contributor.author","Buchwald, Daniela"],["dc.contributor.author","Schaffelhofer, Stefan"],["dc.contributor.author","Dörge, Matthias"],["dc.contributor.author","Dann, Benjamin"],["dc.contributor.author","Scherberger, Hansjörg"],["dc.date.accessioned","2021-07-05T14:57:54Z"],["dc.date.available","2021-07-05T14:57:54Z"],["dc.date.issued","2021"],["dc.description.abstract","Grasping movements are some of the most common movements primates do every day. They are important for social interactions as well as picking up objects or food. Usually, these grasping movements are guided by vision but proprioceptive and haptic inputs contribute greatly. Since grasping behaviors are common and easy to motivate, they represent an ideal task for understanding the role of different brain areas during planning and execution of complex voluntary movements in primates. For experimental purposes, a stable and repeatable presentation of the same object as well as the variation of objects is important in order to understand the neural control of movement generation. This is even more the case when investigating the role of different senses for movement planning, where objects need to be presented in specific sensory modalities. We developed a turntable setup for non-human primates (macaque monkeys) to investigate visually and tactually guided grasping movements with an option to easily exchange objects. The setup consists of a turntable that can fit six different objects and can be exchanged easily during the experiment to increase the number of presented objects. The object turntable is connected to a stepper motor through a belt system to automate rotation and hence object presentation. By increasing the distance between the turntable and the stepper motor, metallic components of the stepper motor are kept at a distance to the actual recording setup, which allows using a magnetic-based data glove to track hand kinematics. During task execution, the animal sits in the dark and is instructed to grasp the object in front of it. Options to turn on a light above the object allow for visual presentation of the objects, while the object can also remain in the dark for exclusive tactile exploration. A red LED is projected onto the object by a one-way mirror that serves as a grasp cue instruction for the animal to start grasping the object. By comparing kinematic data from the magnetic-based data glove with simultaneously recorded neural signals, this setup enables the systematic investigation of neural population activity involved in the neural control of hand grasping movements."],["dc.description.abstract","Grasping movements are some of the most common movements primates do every day. They are important for social interactions as well as picking up objects or food. Usually, these grasping movements are guided by vision but proprioceptive and haptic inputs contribute greatly. Since grasping behaviors are common and easy to motivate, they represent an ideal task for understanding the role of different brain areas during planning and execution of complex voluntary movements in primates. For experimental purposes, a stable and repeatable presentation of the same object as well as the variation of objects is important in order to understand the neural control of movement generation. This is even more the case when investigating the role of different senses for movement planning, where objects need to be presented in specific sensory modalities. We developed a turntable setup for non-human primates (macaque monkeys) to investigate visually and tactually guided grasping movements with an option to easily exchange objects. The setup consists of a turntable that can fit six different objects and can be exchanged easily during the experiment to increase the number of presented objects. The object turntable is connected to a stepper motor through a belt system to automate rotation and hence object presentation. By increasing the distance between the turntable and the stepper motor, metallic components of the stepper motor are kept at a distance to the actual recording setup, which allows using a magnetic-based data glove to track hand kinematics. During task execution, the animal sits in the dark and is instructed to grasp the object in front of it. Options to turn on a light above the object allow for visual presentation of the objects, while the object can also remain in the dark for exclusive tactile exploration. A red LED is projected onto the object by a one-way mirror that serves as a grasp cue instruction for the animal to start grasping the object. By comparing kinematic data from the magnetic-based data glove with simultaneously recorded neural signals, this setup enables the systematic investigation of neural population activity involved in the neural control of hand grasping movements."],["dc.identifier.doi","10.3389/fnbeh.2021.648483"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/87768"],["dc.notes.intern","DOI-Import GROB-441"],["dc.relation.eissn","1662-5153"],["dc.title","A Turntable Setup for Testing Visual and Tactile Grasping Movements in Non-human Primates"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]