Spatial updating and the maintenance of visual constancy
Recent experiments in neurophysiology have begun to examine the active nature of our perceptual experience.
One area of research focuses on the impact of eye movements on visual perception.
We tested this by monitoring the activity of neurons in LIP while varying the direction over which a stimulus trace must be updated.
We found that individual neurons remap stimulus traces in multiple directions, though the strength of the remapped response is variable.
Cutting, (2008) “Functional MRI of Sentence Comprehension in Children with Dyslexia: Beyond Word Recognition” Cerebral Cortex J.
We tested this by comparing the signal related to within- and across-hemifield remapping.
We predicted that in split-brain monkeys, across-hemifield remapping would be abolished while within-hemifield remapping would remain robust.
Second, to begin to understand the circuitry underlying remapping, we studied a special case: when a stimulus must be updated from one visual hemifield to the other.
We hypothesized that the forebrain commissures provide the primary route for this across-hemifield remapping.
The current study examined the role of vision in spatial updating and its potential contribution to an increased risk of falls in older adults.