Aaron Johnson, PhD
Associate Professor and Associate Chair, Psychology
My research studies visual perception, focusing on how we view images of real world scenes (also termed natural scenes), and the factors that influence eye movements. By using photographs and video of natural scenes, my aim is to isolate what properties of an image do we use to recognize and classify the type of scene we are viewing, and how do changes in these properties alter our perception of the image. This research employed traditional techniques such as psychophysics and eye tracking, as well as new techniques such as computational neuroscience, gaze-contingent stimuli modifications, augmented virtual reality, as well as studying the underlying neural activity using EEG. My research also focuses on how various visual (e.g., macular degeneration), cognitive (e.g., stress, dual-tasking), and the loss of other senses (e.g., hearing loss) effect the visual system, and in particular, eye movements. This research is funded by NSERC, CIHR, SSHRC, FRQSC, FRQNT, FRQS, and the Office of Naval Research.
Wittich, W., Southall, K., & Johnson,A.P., (2015) Use of Assistive Listening Devices by Indivisuals with Low Vision. Disability and Rehabilitation:Assistive Technology (in press) doi:10.3109/17483107.2015.1042076
Fraser, S., Johnson, A.P., Overbury,O., & Wittich, W. (2015) Identifying the critical success factors in makinga positive personal choice towards low vision rehabilitation services: Adecision tree analysis. Ophthalmic and PhysiologicalOptics, doi: 10.1111/opo.12169.
Brand, J., & Johnson, A.P. (2014)Attention to local and global levels of hierarchal Navon figures affectsrapid scene categorization. Frontiers in Psychology. 5:1274.doi: 10.3389/fpsyg.2014.01274.
Brand, J., Oriet, C., Johnson, A.P., &Wolfe, J., (2014) The effects of target foreknowledge on linearly- andnonlinearly-separable search along an irrelevant search dimension. Actas Psychology, 153, 129-138. doi:10.1016/j.actpsy.2014.10.002
Loschky, L.C., Ringer, R., Johnson, A.P., Larson, A.M., Neider, M., & Kramer, A. (2014). Blur detection is unaffected by cognitiveload. Visual Cognition. 22, 522-547.
Ringer, R. V., Johnson, A. P., Gaspar, J., Neider, M., Crowell, J., Kramer, A. F.,& Loschky, L. C. (2014). Creating a new dynamic measure of the Useful Fieldof View. In J. Mulligan (Ed.), Proceedings of the 2014 Symposium on Eye Tracking Research and Applications: ACM.
Johnson,A.P. (2013) Investigating eyemovements during tasks of daily living. Visibility7(1), 13-14.Johnson, A.P.,Woods-Fry, H., & Wittich, W. (2012) Magnification does not improve performance in an emotion recognition task for patients with age-related macular degeneration. Investigative Ophthalmology & Visual Science, 12(53); 4386.
Ellemberg, D., Hansen, B.C., & Johnson, A.P. (2012) The developing visual system is not optimally sensitive to the spatial statistics of natural images. Vision Research, 67(15): 1-7.
Johnson, A. P., Richard, B., Hansen, B.C. & Ellemberg, D. (2011) Center-surround effect in human discrimination of amplitude spectrum slope. Journal of Vision, 11(7): 14, 1-10.