Poster D126, Monday, March 27, 8:00 – 10:00 am, Pacific Concourse
An integrated view of visual lateralization: Correlations and modulating factors
Sanne Brederoo1, Mark R. Nieuwenstein1, Frans W. Cornelissen1, Monicque M. Lorist1; 1University of Groningen
More than fifty years of research has shown that the left (LH) and right hemispheres (RH) are each specialized in a range of visual processes. However, these processes have been studied mostly in isolation from one another. As a consequence, it has remained unclear whether and how lateralization of one visual process relates to lateralization of another. We propose an integrated view of visual lateralization based on spatial attention, high (HSF) and low (LSF) spatial frequency processing, global and local level processing, visual word processing and face perception, as tested using the visual half field paradigm (n=122). In line with recently proposed theories, we found that stronger RH-lateralization for faces relates to stronger LH-lateralization for words (r=.27, p=.005), and stronger LH-lateralization for local level processing (r=.19, p=.053), the latter two which also positively correlate (r=.24, p=.023). Furthermore, the stronger the LH-lateralization for HSF processing, the weaker the RH-lateralized for face perception (r=-.18, p=.049), but the stronger the RH attentional bias (r=.24, p=.012). Finally, RH-lateralization for LSF processing correlates with RH-lateralization for global level processing (r=.24, p=.013). With regard to modulating factors, right-handed participants show stronger lateralization for faces (t=3, p=.003), LSF processing (t=2.8, p=.006), and words (t=2.5, p=.01), than left-handed participants. Men show stronger lateralization for local processing (t=2.7, p=.009) and marginally significantly stronger lateralization for global processing (t=1.8, p=.07), than women. In sum, visual processes are not independently lateralized, but they form part of a lateralized network, which can be affected by factors such as handedness and sex.
Topic Area: PERCEPTION & ACTION: Vision