Human posterior parietal cortex encodes the movement goal in a pro-/anti-reach task

Gertz, Hanna; Fiehler, Katja

doi:10.1152/jn.01039.2014

Cited by 25 publications

(66 citation statements)

References 67 publications

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“…Finally, we reiterate that our task was not designed to discriminate between different egocentric frames (e.g. eye, head, body), but based on previous studies, it is likely that the occipital and parietal areas that we reported here utilize a predominantly gaze‐centred code (DeSouza et al ., ; Fernandez‐Ruiz et al ., ; Gertz & Fiehler, ).…”

Section: Discussionmentioning

confidence: 99%

“…eye–head–torso–arm) in the superior parietal/frontal cortical network during simple goal‐directed reaches (Andersen et al ., , ; Batista et al ., ; Connolly et al ., ; Vesia et al ., ). In the past decade, there has been a trend to examine more complex ‘indirect transformations’ involving behaviours as such as anti‐reaching (Gail & Andersen, ; Gertz & Fiehler, ; Cappadocia et al ., ), visual–motor rotation tasks (Hawkins et al ., ), prism reversal (Fernandez‐Ruiz et al ., ) and allocentric coding. Recently, it has been shown that the cortex has specific mechanisms for the representation of reach targets relative to other landmarks (Chen et al ., ), but it was not known how these are transformed into egocentric coordinates.…”

Section: Discussionmentioning

confidence: 99%

“…eyehead-torso-arm) in the superior parietal/frontal cortical network during simple goal-directed reaches (Andersen et al, 1993(Andersen et al, , 1998Batista et al, 1999;Connolly et al, 2007;Vesia et al, 2010). In the past decade, there has been a trend to examine more complex 'indirect transformations' involving behaviours as such as anti-reaching (Gail & Andersen, 2006;Gertz & Fiehler, 2015;Cappadocia (Hawkins et al, 2013), prism reversal (Fernandez-Ruiz et al, 2007) and allocentric coding.…”

Section: Discussionmentioning

confidence: 99%

“…Taken together, our results suggest that right pPrecuneus, right Pre-SMA and bilateral PMd are the best likely candidates for the Allo-Ego conversion in our tasks, although they likely also play other, more general functions in vision and reach planning. For example, precuneus has been observed to be active during other types of visual-motor dissociation tasks (Fernandez-Ruiz et al, 2007;Gertz & Fiehler, 2015;Gorbet & Sergio, 2016), and it was also implicated in the automatic coding of allocentric targets in large background coordinates (Uchimura et al, 2015) and processing spatial information for motor imagery (Cavanna & Trimble, 2006).…”

Section: Specific Areas Involved In the Allo-ego Conversionmentioning

confidence: 99%

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Neural substrates for allocentric‐to‐egocentric conversion of remembered reach targets in humans

Chen

Monaco

Crawford

2018

Eur J of Neuroscience

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Targets for goal-directed action can be encoded in allocentric coordinates (relative to another visual landmark), but it is not known how these are converted into egocentric commands for action. Here, we investigated this using a slow event-related fMRI paradigm, based on our previous behavioural finding that the allocentric-to-egocentric (Allo-Ego) conversion for reach is performed at the first possible opportunity. Participants were asked to remember (and eventually reach towards) the location of a briefly presented target relative to another visual landmark. After a first memory delay, participants were forewarned by a verbal instruction if the landmark would reappear at the same location (potentially allowing them to plan a reach following the auditory cue before the second delay), or at a different location where they had to wait for the final landmark to be presented before response, and then reach towards the remembered target location. As predicted, participants showed landmark-centred directional selectivity in occipital-temporal cortex during the first memory delay, and only developed egocentric directional selectivity in occipital-parietal cortex during the second delay for the 'Same cue' task, and during response for the 'Different cue' task. We then compared cortical activation between these two tasks at the times when the Allo-Ego conversion occurred, and found common activation in right precuneus, right presupplementary area and bilateral dorsal premotor cortex. These results confirm that the brain converts allocentric codes to egocentric plans at the first possible opportunity, and identify the four most likely candidate sites specific to the Allo-Ego transformation for reaches.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Specific Areas Involved In the Allo-ego Conversionmentioning

confidence: 99%

See 2 more Smart Citations

Neural substrates for allocentric‐to‐egocentric conversion of remembered reach targets in humans

Chen

Monaco

Crawford

2018

Eur J of Neuroscience

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“…These findings revealed unknown roles played by these four areas in early visuospatial transformations of reach targets when an allocentric landmark is available to represent targets relative to it. This does not mean that they are exclusive for these functions: previous literature suggests that they likely perform multiple functions, including automatic coding of allocentric targets within large background, egocentric transformations for reach control, as well as general reach planning …”

Section: Neural Mechanisms For Allo‐to‐ego Conversion Of Remembered Rmentioning

confidence: 99%

Allocentric representations for target memory and reaching in human cortex

Chen

Crawford

2019

Annals of the New York Academy of Sciences

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The use of allocentric cues for movement guidance is complex because it involves the integration of visual targets and independent landmarks and the conversion of this information into egocentric commands for action. Here, we focus on the mechanisms for encoding reach targets relative to visual landmarks in humans. First, we consider the behavioral results suggesting that both of these cues influence target memory, but are then transformed—at the first opportunity—into egocentric commands for action. We then consider the cortical mechanisms for these behaviors. We discuss different allocentric versus egocentric mechanisms for coding of target directional selectivity in memory (inferior temporal gyrus versus superior occipital gyrus) and distinguish these mechanisms from parieto‐frontal activation for planning egocentric direction of actual reach movements. Then, we consider where and how the former allocentric representations of remembered reach targets are converted into the latter egocentric plans. In particular, our recent neuroimaging study suggests that four areas in the parietal and frontal cortex (right precuneus, bilateral dorsal premotor cortex, and right presupplementary area) participate in this allo‐to‐ego conversion. Finally, we provide a functional overview describing how and why egocentric and landmark‐centered representations are segregated early in the visual system, but then reintegrated in the parieto‐frontal cortex for action.

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Anatomy and white-matter connections of the precuneus

Tanglay

Young²,

Dadario

et al. 2021

Brain Imaging and Behavior

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Human posterior parietal cortex encodes the movement goal in a pro-/anti-reach task

Abstract: Gertz H, Fiehler K. Human posterior parietal cortex encodes the movement goal in a pro-/anti-reach task.

Cited by 25 publications

References 67 publications

Neural substrates for allocentric‐to‐egocentric conversion of remembered reach targets in humans

Neural substrates for allocentric‐to‐egocentric conversion of remembered reach targets in humans

Allocentric representations for target memory and reaching in human cortex

Anatomy and white-matter connections of the precuneus

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