Spatial updating

However, it has so far simulated actual experiments using a simplified one-dimensional design of visual space.

To allow for realistic simulations of more complex experiments, we started by extending the original model to operate in two image dimensions.

The lingering effect originates from the late updating of the proprioceptive eye-position signal and the remapping from the early corollary-discharge signal.

We put these results in relationship to predictive remapping of receptive fields and show that both phenomena arise from the same simple, recurrent neural circuit.

Furthermore, it is not clear whether the recently observed phenomena of spatial updating of attention relate to the observation of predictive remapping of receptive fields.

In the seminal study of Duhamel, Colby, and Goldberg (1992), a flashed stimulus in the future receptive field—that is, the location of a neuron's receptive field after saccade—evoked a neural response prior to saccade.

Due to lack of data and sometimes even conflicting data, a pure bottom-up approach at the systems level of brain networks is presently not feasible for neuro-computational modeling.

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Recently, two different types of perisaccadic attentional updates were discovered: predictive remapping of attention before saccade onset (Rolfs, Jonikaitis, Deubel, & Cavanagh, 2011) and lingering of attention after saccade (Golomb, Chun, & Mazer, 2008; Golomb, Pulido, Albrecht, Chun, & Mazer, 2010).

Two studies investigated updating of self-position and heading during real, imagined, and simulated locomotion.

Subjects were exposed to a two-segment path with a turn between segments; they responded by turning to face the origin as they would if they had walked the path and were at the end of the second segment.

While this can be interpreted as an anticipatory shift of the receptive field, Cavanagh, Hunt, Afraz, and Rolfs (2010) suggested that it may also be explained by learned horizontal or lateral connections.

Furthermore, they proposed that such a transfer of activation may also be responsible for spatial updating of attention.

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