RT Journal Article SR Electronic T1 Attention Effects on Neural Population Representations for Shape and Location Are Stronger in the Ventral than Dorsal Stream JF eneuro JO eNeuro FD Society for Neuroscience SP ENEURO.0371-17.2018 DO 10.1523/ENEURO.0371-17.2018 VO 5 IS 2 A1 Anne B. Sereno A1 Sidney R. Lehky YR 2018 UL http://www.eneuro.org/content/5/2/ENEURO.0371-17.2018.abstract AB We examined how attention causes neural population representations of shape and location to change in ventral stream (AIT) and dorsal stream (LIP). Monkeys performed two identical delayed-match-to-sample (DMTS) tasks, attending either to shape or location. In AIT, shapes were more discriminable when directing attention to shape rather than location, measured by an increase in mean distance between population response vectors. In LIP, attending to location rather than shape did not increase the discriminability of different stimulus locations. Even when factoring out the change in mean vector response distance, multidimensional scaling (MDS) still showed a significant task difference in AIT, but not LIP, indicating that beyond increasing discriminability, attention also causes a nonlinear warping of representation space in AIT. Despite single-cell attentional modulations in both areas, our data show that attentional modulations of population representations are weaker in LIP, likely due to a need to maintain veridical representations for visuomotor control.