Interhemispheric Integration of Visual Processing during Task-Driven Lateralization

Interhemispheric integration of visual processing during task-driven lateralization.

The mechanisms underlying interhemispheric integration (IHI) remain poorly understood, particularly for lateralized cognitive processes. To test competing theories of IHI, we constructed and fitted dynamic causal models to functional magnetic resonance data from two visual tasks that operated on identical stimuli but showed opposite hemispheric dominance. Using a systematic Bayesian model selec...

Interhemispheric integration in visual search

The search task of Luck, Hillyard, Mangun and Gazzaniga (1989) was optimised to test for the presence of a bilateral field advantage in the visual search capabilities of normal subjects. The modified design used geometrically regular arrays of 2, 4 or 8 items restricted to hemifields delineated by the vertical or horizontal meridian; the target, if present, appeared at one of two fixed position...

Précis of “Modeling visual lateralization and interhemispheric communication”

Lateralization is intertwined with virtually every function that we think makes us human, including language, fine motor skills, and visuo-spatial processing. In my PhD thesis, I attempted to give a computational account of lateralization in visual processing, offering hypotheses about its neural underpinnings, neurodevelopmental origins, and relationship to interhemispheric transfer. To do so,...

Interhemispheric integration of visual concepts in infancy

Abstraction often requires appropriate integration of more concrete representations. During development, the more specific or localized representations may arise first. Here we study the special case of integration of visual representations from the left and right hemispheres during infancy. We present failures of interhemispheric integration in two domains, form perception and approximate numb...

Lateralization of Cognitive Functions: The Visual Half-Field Task Revisited