Poster B44, Sunday, March 25, 8:00-10:00 am, Exhibit Hall C
A functional magnetic resonance imaging investigation of the overlap between voluntary and reflexive spatial attention and lexical and sublexical reading
Chelsea Ekstrand1, Josh Neudorf1, Marla Mickleborough1, Layla Gould1, Ron Borowsky1; 1University of Saskatchewan
Spatial attention and reading processes have long been investigated in isolation, however there has recently been a shift to investigate their potential interactive effects behaviorally (e.g., Franceschini et al., 2012). Neuroanatomically, both reading and attentional processes have been shown to dissociate along dorsal and ventral streams- lexical reading engaging a left ventral occipito-temporal circuit and sublexical reading engaging a left dorsal temporo-parietal circuit. Similarly, voluntary attention engages a dorsal attentional system (frontal eye fields; superior parietal lobule, SPL; and intraparietal sulcus, IPS), whereas reflexive attention engages a ventral attentional system (temporo-parietal junction, TPJ; intraparietal sulcus, IPS; and inferior and middle frontal gyri). However, the overlapping neural correlates of attention and reading have yet to be explored. Therefore, we sought to investigate the overlapping neural mechanisms of spatial attention and reading using fMRI. Participants performed two attentional orienting tasks (reflexive and voluntary) and two reading tasks (lexical and sublexical). We hypothesized that sublexical reading would show greater overlap with the voluntary attention task in dorsal attentional areas, whereas lexical reading would show greater overlap with the reflexive attention task in ventral attentional areas. Results showed unique overlap between reflexive attention and lexical reading in the right TPJ, right frontal operculum (rFO), and right putamen. Sublexical reading showed unique overlap with voluntary attention in the right SPL and the right IPS, whereas lexical reading showed overlap in the rTPJ and rFO. These results elucidate several neuroanatomical regions of overlap between attentional and single-word reading processes that underlie their interactive effects.
Topic Area: LANGUAGE: Other