scholarly journals Temporal dynamics of object location processing in allocentric reference frame

2017 ◽  
Vol 54 (9) ◽  
pp. 1346-1358 ◽  
Author(s):  
Ágoston Török ◽  
Andrea Kóbor ◽  
György Persa ◽  
Péter Galambos ◽  
Péter Baranyi ◽  
...  
Keyword(s):  
Reference Frame ◽  
Temporal Dynamics ◽  
Object Location ◽  
Allocentric Reference Frame

Frames of Reference for Hand Orientation

1995 ◽  
Vol 7 (2) ◽  
pp. 182-195 ◽  
Author(s):  
Martha Flanders ◽  
John F. Soechting
Keyword(s):  
Reference Frame ◽  
Neural Control ◽  
Human Subjects ◽  
Object Orientation ◽  
Frame Of Reference ◽  
Object Location ◽  
Frames Of Reference ◽  
Spatial Reference ◽  
Hand Orientation ◽  
Spatial Reference Frame

In reaching and grasping movements, information about object location and object orientation is used to specify the appropriate proximal arm posture and the appropriate positions for the wrist and fingers. Since object orientation is ideally defined in a frame of reference fixed in space, this study tested whether the neural control of hand orientation is also best described as being in this spatial reference frame. With the proximal arm in various postures, human subjects used a handheld rod to approximate verbally defined spatial orientations. Subjects did quite well at indicating spatial vertical and spatial horizontal but made consistent errors in estimating 45° spatial slants. The errors were related to the proximal arm posture in a way that indicated that oblique hand orientations may be specified as a compromise between a reference frame fixed in space and a reference frame fixed to the arm. In another experiment, where subjects were explicitly requested to use a reference frame fixed to the arm, the performance was consistently biased toward a spatial reference frame. The results suggest that reaching and grasping movements may be implemented as an amalgam of two frames of reference, both neurally and behaviorally.

scholarly journals Repetition effects in action selection reflect effector- but not hemisphere-specific coding

2021 ◽  
Author(s):  
Christian Seegelke ◽  
Carolin Schonard ◽  
Tobias Heed
Keyword(s):  
Reference Frame ◽  
Response Times ◽  
Action Selection ◽  
Repetition Effects ◽  
Egocentric Reference Frame ◽  
Left Hand ◽  
Body Side ◽  
Baseline Activity ◽  
Neural Populations ◽  
Allocentric Reference Frame

Action choices are influenced by future and recent past action states. For example, when performing two actions in succession, response times (RT) to initiate the second action are reduced when the same hand is used. These findings suggest the existence of effector-specific processing for action selection. However, given that each hand is primarily controlled by the contralateral hemisphere, the RT benefit might actually reflect body side or hemisphere-specific rather than effector-specific repetition effects. Here, participants performed two consecutive movements, each with a hand or a foot, in one of two directions. Direction was specified in an egocentric reference frame (inward, outward) or in an allocentric reference frame (left, right). Successive actions were initiated faster when the same limb (e.g., left hand - left hand), but not when the other limb of the same body side (e.g., left foot - left hand) executed the second action. The same-limb advantage was evident even when the two movements involved different directions, whether specified egocentrically or allocentrically. Corroborating evidence from computational modeling lends support to the claim that repetition effects in action selection reflect persistent changes in baseline activity within neural populations that encode effector-specific action plans.

scholarly journals The Simon Effect Based on Allocentric and Egocentric Reference Frame: Common and Specific Neural Correlates

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Hui Li ◽  
Nan Liu ◽  
You Li ◽  
Ralph Weidner ◽  
Gereon R. Fink ◽  
...  
Keyword(s):  
Reference Frame ◽  
Simon Effect ◽  
Neural Mechanisms ◽  
Precentral Gyrus ◽  
Egocentric Reference Frame ◽  
Frontoparietal Network ◽  
Object Locations ◽  
Allocentric Reference Frame ◽  
The Right ◽  
Task Irrelevant

Abstract An object’s location can be represented either relative to an observer’s body effectors (egocentric reference frame) or relative to another external object (allocentric reference frame). In non-spatial tasks, an object’s task-irrelevant egocentric position conflicts with the side of a task-relevant manual response, which defines the classical Simon effect. Growing evidence suggests that the Simon effect occurs not only based on conflicting positions within the egocentric but also within the allocentric reference frame. Although neural mechanisms underlying the egocentric Simon effect have been extensively researched, neural mechanisms underlying the allocentric Simon effect and their potential interaction with those underlying its egocentric variant remain to be explored. In this fMRI study, spatial congruency between the task-irrelevant egocentric and allocentric target positions and the task-relevant response hand was orthogonally manipulated. Behaviorally, a significant Simon effect was observed for both reference frames. Neurally, three sub-regions in the frontoparietal network were involved in different aspects of the Simon effect, depending on the source of the task-irrelevant object locations. The right precentral gyrus, extending to the right SMA, was generally activated by Simon conflicts, irrespective of the spatial reference frame involved, and showed no additive activity to Simon conflicts. In contrast, the right postcentral gyrus was specifically involved in Simon conflicts induced by task-irrelevant allocentric, rather than egocentric, representations. Furthermore, a right lateral frontoparietal network showed increased neural activity whenever the egocentric and allocentric target locations were incongruent, indicating its functional role as a mismatch detector that monitors the discrepancy concerning allocentric and egocentric object locations.

scholarly journals State-dependent egocentric and allocentric heading representation in the monarch butterfly brain

2021 ◽  
Author(s):  
M. Jerome Beetz ◽  
Christian Kraus ◽  
Myriam Franzke ◽  
David Dreyer ◽  
Martin F. Strube-Bloss ◽  
...  
Keyword(s):  
Reference Frame ◽  
Reference Frames ◽  
Danaus Plexippus ◽  
Monarch Butterfly ◽  
Central Complex ◽  
Dependent Manner ◽  
The Sun ◽  
Monarch Butterflies ◽  
State Dependent ◽  
Allocentric Reference Frame

AbstractHead direction can be represented in a self-centered egocentric or a viewpoint-invariant allocentric reference frame. Using the most efficient representation is especially crucial for migrating animals, like monarch butterflies (Danaus plexippus) that use the sun for orientation. With tetrode recordings from the brain of tethered flying monarch butterflies, we examined the reference frame in which insects encode heading. We show that compass neurons switch their reference frame in a state-dependent manner. In quiescence, they encode sun-bearing angles, allowing the butterfly to map the environment within an egocentric frame. However, during flight, the same neurons encode heading within an allocentric frame. This switch converts the sun from a local to a global cue, an ideal strategy for maintaining a migratory heading over large distance.One-Sentence SummaryHeading information is encoded in different state-dependent reference frames in the monarch butterfly central complex

scholarly journals Patterns of Bimanual Interference Reveal Movement Encoding within a Radial Egocentric Reference Frame

2002 ◽  
Vol 14 (3) ◽  
pp. 463-471 ◽  
Author(s):  
Stephan P. Swinnen ◽  
Natalia Dounskaia ◽  
Jacques Duysens
Keyword(s):  
Reference Frame ◽  
Brain Regions ◽  
Action Space ◽  
Egocentric Reference Frame ◽  
Bimanual Movements ◽  
Temporal Features ◽  
Cell Recording ◽  
Interference Invariant ◽  
Allocentric Reference Frame ◽  
Primary Focus

Constraints on interlimb coordination have been studied intensively in past years with a primary focus on temporal features. The present study addressed spatial constraints or the degree of directional interference as a function of different line combinations between the upper limbs as well as the modulation of this interference as a result of different board orientations within the performer's workspace. This paradigm was used to address a prominent theme in motor neuroscience, namely whether (bimanual) movements are encoded within an allocentric reference frame (pattern of interference invariant with respect to extrinsic space) or within an egocentric reference frame (pattern of interference invariant relative to the center of the performer's action space, i.e., intrinsic). The observed patterns of interference revealed that movements are primarily encoded within a radial egocentric reference frame in which the performer is the center of action space. The present psychophysical findings converge with primate single-cell recording studies in which the direction has been identified as a primary movement parameter that is encoded in various brain regions, thereby constituting a principal determinant of bilateral interference.

scholarly journals Human Brain Dynamics Accompanying Use of Egocentric and Allocentric Reference Frames during Navigation

2010 ◽  
Vol 22 (12) ◽  
pp. 2836-2849 ◽  
Author(s):  
Klaus Gramann ◽  
Julie Onton ◽  
Davide Riccobon ◽  
Hermann J. Mueller ◽  
Stanislav Bardins ◽  
...  
Keyword(s):  
Reference Frame ◽  
Reference Frames ◽  
Spatial Information ◽  
Egocentric Reference Frame ◽  
Cortical Areas ◽  
Alpha Blocking ◽  
Power Spectral ◽  
Eeg Data ◽  
Allocentric Reference Frame ◽  
Continued Use

Maintaining spatial orientation while travelling requires integrating spatial information encountered from an egocentric viewpoint with accumulated information represented within egocentric and/or allocentric reference frames. Here, we report changes in high-density EEG activity during a virtual tunnel passage task in which subjects respond to a postnavigation homing challenge in distinctly different ways—either compatible with a continued experience of the virtual environment from a solely egocentric perspective or as if also maintaining their original entrance orientation, indicating use of a parallel allocentric reference frame. By spatially filtering the EEG data using independent component analysis, we found that these two equal subject subgroups exhibited differences in EEG power spectral modulation during tunnel passages in only a few cortical areas. During tunnel turns, stronger alpha blocking occurred only in or near right primary visual cortex of subjects whose homing responses were compatible with continued use of an egocentric reference frame. In contrast, approaching and during tunnel turns, subjects who responded in a way compatible with use of an allocentric reference frame exhibited stronger alpha blocking of occipito-temporal, bilateral inferior parietal, and retrosplenial cortical areas, all areas implicated by hemodynamic imaging and neuropsychological observation in construction and maintenance of an allocentric reference frame. We conclude that in these subjects, stronger activation of retrosplenial and related cortical areas during turns support a continuous translation of egocentrically experienced visual flow into an allocentric model of their virtual position and movement.

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