From visual affordances in monkey parietal cortex to hippocampo–parietal interactions underlying rat navigation

Arbib, Michael A.

doi:10.1098/rstb.1997.0129

Cited by 47 publications

(28 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Related activations have been reported for the dPMC, the superior parietal lobe, the superior temporal sulcus (Grezes et al, 2003;Mecklinger et al, 2002) and the posterior cingulate (Mecklinger et al, 2002)-regions which also display significant activity in this fourth network. The question remains whether affordances are triggered immediately during the perception of an object or only in the case of an intention to act on it (Arbib, 1997;Grezes et al, 2003). ICA is able to identify regions that are activated at the same time, and the time course analysis from the maxima can be used to relate these networks to aspects of the task.…”

Section: Discussionmentioning

confidence: 99%

Dissociating networks of imitation

Menz

McNamara

Klemen

et al. 2009

Human Brain Mapping

View full text Add to dashboard Cite

The investigation of imitation, which consists of observation and later reproduction of voluntary actions, promises insights into the complex processes of human actions. Although several aspects concerning the component neural processes necessary for action execution are known, our current understanding of the neural networks underlying these remains sparse. The present study applies independent component analysis (ICA) to functional magnetic resonance imaging (fMRI) data acquired during imitation of abstract gestures and object-related actions. This enables identification of neural networks underlying the production of these imitations. The explorative approach of ICA is complemented by an analysis of time courses from the maxima of each component. Four independent networks were active during delayed imitation. These can be assigned to the aspects of (1) action perception, (2) motor preparation and action execution, (3) encoding and retrieval into and from working memory, as well as (4) the dynamic integration of object affordances into the action. At least two of these networks participate in action preparation, one contains areas involved with motor working memory and one includes areas which are connected to the true action execution. The fourth network only shows activity shortly before an object-related action is imitated. This indicates a late integration of object affordances into the movement as the time course of activity in this network pertains to action rather than perception of the object.

show abstract

Section: Discussionmentioning

confidence: 99%

Dissociating networks of imitation

Menz

McNamara

Klemen

et al. 2009

Human Brain Mapping

View full text Add to dashboard Cite

show abstract

“…Conceptualizations of navigational circuitry have assigned PPC the role of processing visual landmark information and the integration of self-movement and visuospatial cues (Arbib, 1997; McNaughton et al, 1996; Save & Poucet, 2000a; Taube, 1998). To test this hypothesis, we produced lesions of PPC using two commonly used coordinates for PPC.…”

mentioning

confidence: 99%

Landmark control and updating of self-movement cues are largely maintained in head direction cells after lesions of the posterior parietal cortex.

Calton

Turner

Cyrenne

et al. 2008

Behavioral Neuroscience

View full text Add to dashboard Cite

Head direction (HD) cells discharge as a function of the rat's directional orientation with respect to its environment. Because animals with posterior parietal cortex (PPC) lesions exhibit spatial and navigational deficits, and the PPC is indirectly connected to areas containing HD cells, we determined the effects of bilateral PPC lesions on HD cells recorded in the anterodorsal thalamus. HD cells from lesioned animals had similar firing properties compared to controls and their preferred firing directions shifted a corresponding amount following rotation of the major visual landmark. Because animals were not exposed to the visual landmark until after surgical recovery, these results provide evidence that the PPC is not necessary for visual landmark control or the establishment of landmark stability. Further, cells from lesioned animals maintained a stable preferred firing direction when they foraged in the dark and were only slightly less stable than controls when they self-locomoted into a novel enclosure. These findings suggest that PPC does not play a major role in the use of landmark and self-movement cues in updating the HD cell signal, or in its generation.

show abstract

“…There is a strong similarity (Arbib, 1997) between path integration and dynamic remapping, since in path integration there is an updating of the representation of "home base" relative to the animal as the animal moves, and in dynamic remapping during saccades there is an updating of the representation of a visual target relative to the fovea as the eye moves. In each case, the relative position has to be shifted in a direction equal and opposite to the intervening movement.…”

Section: Path Integration Processing Modulementioning

confidence: 94%

Competitive Hebbian learning and the hippocampal place cell system: Modeling the interaction of visual and path integration cues

2001

Self Cite

View full text Add to dashboard Cite

The hippocampus has long been thought essential for implementing a cognitive map of the environment. However, almost 30 years since place cells were found in rodent hippocampal field CA1, it is still unclear how such an allocentric representation arises from an ego-centrically perceived world. By means of a competitive Hebbian learning rule responsible for coding visual and path integration cues, our model is able to explain the diversity of place cell responses observed in a large set of electrophysiological experiments with a single fixed set of parameters. Experiments included changes observed in place fields due to exploration of a new environment, darkness, retrosplenial cortex inactivation, and removal, rotation, and permutation of landmarks. To code for visual cues for each landmark, we defined two perceptual schemas representing landmark bearing and distance information over a linear array of cells. The information conveyed by the perceptual schemas is further processed through a network of adaptive layers which ultimately modulate the resulting activity of our simulated place cells. In path integration terms, our system is able to dynamically remap a bump of activity coding for the displacement of the animal in relation to an environmental anchor. We hypothesize that path integration information is computed in the rodent posterior parietal cortex and conveyed to the hippocampus where, together with visual information, it modulates place cell activity. The resulting network yields a more direct treatment of partial remapping of place fields than other models. In so doing, it makes new predictions regarding the nature of the interaction between visual and path integration cues during new learning and when the system is challenged with environmental changes.

show abstract

From visual affordances in monkey parietal cortex to hippocampo–parietal interactions underlying rat navigation

Cited by 47 publications

References 32 publications

Dissociating networks of imitation

Dissociating networks of imitation

Landmark control and updating of self-movement cues are largely maintained in head direction cells after lesions of the posterior parietal cortex.

Competitive Hebbian learning and the hippocampal place cell system: Modeling the interaction of visual and path integration cues

Contact Info

Product

Resources

About