@Article{ FiehlerBBBSVFR2011,
title = {Working memory maintenance of grasp-target information in the human posterior parietal cortex},
journal = {NeuroImage},
year = {2011},
month = {2},
volume = {54},
number = {3},
pages = {2401-2411},
abstract = {Event-related functional magnetic resonance imaging was applied to identify cortical areas involved in maintaining target information in working memory used for an upcoming grasping action. Participants had to grasp with their thumb and index finger of the dominant right hand three-dimensional objects of different size and orientation. Reaching-to-grasp movements were performed without visual feedback either immediately after object presentation or after a variable delay of 2–12 s. The right inferior parietal cortex demonstrated sustained neural activity throughout the delay, which overlapped with activity observed during encoding of the grasp target. Immediate and delayed grasping activated similar motor-related brain areas and showed no differential activity. The results suggest that the right inferior parietal cortex plays an important functional role in working memory maintenance of grasp-related information. Moreover, our findings confirm the assumption that brain areas engaged in maintaining information are also involved in encoding the same information, and thus extend previous findings on working memory function of the posterior parietal cortex in saccadic behavior to reach-to-grasp movements.},
web_url = {http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6WNP-515SRFP-7-F&_cdi=6968&_user=29041&_pii=S1053811910012826&_origin=&_coverDate=02%2F01%2F2011&_sk=999459996&view=c&wchp=dGLzVzb-zSkWW&md5=ce2995ae61d933302149ce570e9287a3&ie=/sdarticle.pdf},
state = {published},
DOI = {10.1016/j.neuroimage.2010.09.080},
author = {Fiehler K, Bannert M{mbannert}{Department Physiology of Cognitive Processes}, Bischoff M, Blecker C, Stark R, Vaitl D, Franz VH{vf} and R\"osler F}
}

@Poster{ FiehlerBFBSVR2011,
title = {The anterior intraparietal sulcus contributes to visually-guided and memory-guided grasping},
year = {2009},
month = {10},
volume = {39},
number = {355.7},
abstract = {There is general agreement about the posterior parietal cortex, in particular the anterior part of the intraparietal sulcus (aIPS), being engaged in visually guided grasping. The contribution of these areas to memory-guided grasping, however, is still controversial. Electrophysiological studies in monkeys suggest a role of the aIPS in both visually guided and memory-guided grasping. However, some results from patients suggest a dissociation such that the aIPS is involved in immediate grasping while the inferior temporal cortex is involved in memory-guided grasping. Using functional magnetic resonance imaging, we investigated the neural correlates of immediate and delayed grasping in healthy humans. Participants were asked to grasp three-dimensional objects of different size and orientation with their thumb and index finger of the dominant right hand (precision grip). Vision was controlled by liquid crystal shutter goggles that were opened during object presentation but closed during grasping, thus requiring open-loop grasping. An auditory signal either presented immediately after object presentation (immediate grasping) or after a variable delay of two to twelve seconds following object presentation (delayed grasping), signalled the start of the grasp movement. We analysed cortical activity during object presentation, maintenance of object information, and immediate and delayed grasping. Object presentation activated areas along the dorsal and ventral visual streams in both hemispheres and the left sensorimotor cortex. Short-term maintenance of action-related object information revealed activation in the right aIPS and adjacent inferior parietal cortex. A similar activation was observed for delayed in contrast to immediate grasping. In line with electrophysiological monkey data, our results indicate that the aIPS does not only contribute to visually-guided grasping but also stores action-related information used for subsequent memory-guided grasping.},
web_url = {http://www.sfn.org/am2009/},
event_name = {39th Annual Meeting of the Society for Neuroscience (Neuroscience 2009)},
event_place = {Chicago, IL, USA},
state = {published},
author = {Fiehler K, Bannert MM{mbannert}, Franz VH{vf}, Bischoff M, Stark B, Vaitl D and R\"osler F}
}

@Poster{ DetrePBN2007,
title = {Context in free recall: multi-voxel pattern analysis of fMRI},
year = {2007},
month = {11},
volume = {37},
number = {421.1},
abstract = {Several researchers (e.g., Howard & Kahana, 2002) have proposed that recalling an event is bound up with recall of that event's surrounding context, and that retrieved context information can be used to cue memory for other items from that context. In this study, we sought evidence for this contextual reinstatement process using fMRI. Specifically, we wanted to know whether the task being performed when forming a memory would be recalled along with that memory, and how this would influence subsequent recalls.
Subjects studied lists of 24 words, performing either a size, animacy or pleasantness judgment task on each word. After a series of arithmetic distractors, subjects were asked to recall out loud and in any order the words from the most recent list. Since subjects were being scanned during both study and recall phases, we trained a classifier on the study period to distinguish which of the three tasks were being performed. We then tested this classifier during recall to estimate the degree to which each task representation was active in the subject's mind, moment by moment (Polyn et al, 2005).
To analyze the recall data, we labelled each recall with its judgment task from the study period. These were predicted better than chance by the classifier's estimates of task activity at recall. We broke the data down further, looking at the transitions from one recall to the next. We found that high classifier activity for one kind of task judgment indicated that the next recall would be another item from that task, and that the inter-response latency would be small. In other words, a highly active task representation would facilitate recalls of other items from the same task.
These results support the contextual reinstatement theory, suggesting that reinstating the context surrounding an event improves recall of other items that were studied in that context.},
file_url = {fileadmin/user_upload/files/publications/SFN07_detre.pdf},
web_url = {http://www.sfn.org/am2007/},
event_name = {37th Annual Meeting of the Society for Neuroscience (Neuroscience 2007)},
event_place = {San Diego, CA, USA},
state = {published},
author = {Detre GJ, Polyn SM, Bannert MM{mbannert} and Norman KA}
}

@Conference{ BannertFBBSVRF2009,
title = {Gibt es ein Kurzzeitgedächtnis für Greifbewegungen im parietalen Cortex?},
journal = {Experimentelle Psychologie},
year = {2009},
month = {4},
volume = {51},
abstract = {Visuelle Kontrolle von Greifbewegungen erfordert die Anpassung der greifenden Hand an das Zielobjekt auf der Grundlage visueller Information über dessen physikalische Eigenschaften. Einzelzellableitungen an Affen zeigen, dass der anteriore intraparietale Sulcus auf die visuelle Kontrolle und kurzzeitige Speicherung von Greifbewegungen spezialisiert ist. Funktionelle Bildgebungsstudien deuten darauf hin, dass eine vergleichbare Region auch im menschlichen Gehirn existiert. Welche Rolle dieses Areal jedoch bei der kurzfristigen Speicherung visuomotorischer Repräsentationen spielt, wird allerdings kontrovers diskutiert. In der aktuellen fMRT-Studie wurden Versuchspersonen instruiert, nach einem Behaltensintervall variabler Dauer blind nach einem zuvor visuell enkodierten Objekt zu greifen. In einer Kontrollbedingung griffen Versuchspersonen unmittelbar im Anschluss an die Enkodierungsphase nach dem Objekt. Wir finden eine anhaltende Aktivierung des anterioren intraparietalen Sulcus während des Behaltensintervalls. Dies steht im Einklang zu Befunden aus Einzelzellableitungen und aktuellen Arbeitsgedächtnistheorien, denen zufolge Regionen, die für die Echtzeitverarbeitung von Informationen zuständig sind, auch zu deren kurzzeitiger Speicherung beitragen.},
web_url = {http://www.teap.de/index.php/teap2009/jena2009},
event_name = {51. Tagung Experimentell Arbeitender Psychologen (TeaP 2009)},
event_place = {Jena, Germany},
state = {published},
author = {Bannert MM{mbannert}, Franz VH{vf}, Bischoff M, Blecker C, Stark R, Vaitl D, R\"osler F and Fiehler K}
}