Graduate Students

IMAG0141_justmeChéla Willey

Doctoral Student, Cognitive Psychology, UCLA

M.A., Experimental Psychology, CSUSM

B.A., Psychology and Criminology & Justice Studies, CSUSM, magna cum laude


Research Interests

My research interests include motion and action processing, action execution, visual/vestibular integration, motor and perceptual learning, sensory weighting/reweighting and multisensory integration.



Willey, C.R. & Jackson R.E. (2014). Visual field dependence as navigation strategy. Attention, Perception & Psychophysics, 76 (4), 1036–1044. doi: 10.3758/s13414-014-0639-x

Jackson, R. E. & Willey, C. R. (2013). Evolved navigation theory and the plateau illusion. Cognition, 128 (2), 119-126. doi: 10.1016/j.cognition.2013.03.010

Jackson, R.E., Willey, C.R., & Cormack, L.K. (2013) Learning and exposure affect environmental perception less than evolved navigation costs. PLoS ONE 8 (4): e59690. doi: 10.1371/journal.pone.0059690

Jackson, R.E. & Willey, C. R. (2010). Evolved navigation theory and horizontal visual illusions, Cognition, 119 (2), 288-294, doi:10.1016/j.cognition.2010.11.003



Andrew Silva

Doctoral Student, Cognitive Neuroscience, Department of Psychology, UCLA

NSF Graduate Research Fellow

B.A., Psychology, UC Irvine, magna cum laude

M.A., Psychology, UCLA


Research Interests

My research interests include visual motion processing and perceptual learning, multisensory integration and learning, and underlying neural mechanisms of visual and audio-visual perception.

Publications and Conference Papers:

Barakat, B.K., Silva, A.E., Jimenez, L.O., & Shams, L. (In Preparation). Audiovisual congruency increases explicit learning in a serial reaction time task.

Silva, A.E., & Liu, Z. (2015). Opponent backgrounds reduce discrimination sensitivity to competing motions: Effects of different vertical motions on horizontal motion perception. Vision Research, 133,55-64 doi: 10.1016/j.visres.2015.05.007

Silva, A.E., & Chubb, C. (2014). The 3-dimensional, 4-channel model of human visual sensitivity to grayscale scrambles. Vision Research, 101, 94-107. doi: 10.1016/j.visres.2014.06.001

Guan, H., Lee, M.D., & Silva, A. (2014). Threshold models of human decision making on optimal stopping problems in different environments. In Bello, P., Guarini, M., McShane, M., & Scassellati, B. (Eds), Proceedings of the 36th Annual Conference of the Cognitive Sciences Society. 553-558. Austin, TX: Cognitive Sciences Society.

Chubb, C., Dickson, C.A., Dean, T., Fagan, C., Mann, D.S., Wright, C.E., Guan, M., Silva, A.E., Gregersen, P., & Kowaslky, E. (2013). Bimodal distribution of performance in discriminating major/minor modes. Journal of the Acoustical Society of America, 134(4), 3067-3078. doi:10.1121/1.4816546


Silva, A.E., & Liu, Z. [poster]. The effects of different orientations of in-phase and counter-phase backgrounds on horizontal motion discrimination. Vision Sciences Society 14th Annual Meeting. St. Pete Beach, FL, May 2015.

Silva, A.E., Barakat, B.K., Jimenez, L., & Shams, L. [poster]. Audiovisual congruency increases explicit learning in a serial reaction time task. International Multisensory Research Forum, Pisa, IT, June 2015.

Silva, A.E., & Liu, Z. [poster]. Vertical opponency modulates sensitivity to horizontal motion. Vision Sciences  Society 13th Annual Meeting. St. Pete Beach, FL, May 2014.

Guan, M., Silva, A.E., & Lee, M.D. [poster]. Threshold models of human decision-making on optimal stopping problems in different environments. Society for Mathematical Psychology 46th Annual Meeting. Potsdam, Germany, August 2013.

Chubb, C., Silva, A. E. [talk presented by 1st author].  The four human visual mechanisms sensitive to gray scale scrambles. Vision Sciences Society 12th Annual Meeting. Naples, FL, May 2013.

Silva, A.E., Lee, M.D., Gorbunov, M., & Li, A. [poster]. Framing and adaptation effects in optimal stopping problems. Society for Mathematical Psychology 45th Annual Meeting. Columbus, OH, June 2012.

Silva, A.E. [talk].Visual search asymmetry in luminance, contrast, and blackshot texture discrimination. UCI Undergraduate Research Symposium, May 2012



Yang Zen Xing (Mac)

Doctoral Student, Cognitive Psychology {Computational Cognition Specialization}

B.A., Psychology, UCLA


Research Interests

My research interests include shape representation, perceptual organization, depth perception, cue integration, and visual motion processing.


Erlikhman, G., Xing, Y.Z., & Kellman, P.J. (2014). Non-rigid illusory contours and global shape transformations defined by spatiotemporal boundary formation. Frontiers in Human Neurosciences. 8:978. doi:10.3389/fnhum.2014.00978.