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Ernest Greene

Professor of Psychology

Contact Information
Phone: (213) 740-7967
Office: SGM 721



Ph.D. Psychology, University of Oregon, 1/1968
M.A. Psychology, San Jose State University, 1/1965
B.A. Psychology, San Jose State University, 1/1963

Postdoctoral Training

Postdoctoral Fellow, Brain Research Institute, University of California, Los Angeles, 1968-1969  

Academic Appointment, Affiliation, and Employment History

Chief Financial Officer, Neuropsychology Foundation, 01/01/1983-  
Professor, University of Southern California, 01/01/1969-  
Founding Director, Master's in Human Behavior Program, 08/27/2009-05/04/2012  
Associate Chair for Psychology, University of Southern California, 12/31/1999-09/15/2002  
Head, Brain & Cognitive Sciences Area, University of Southern California, 09/15/2000-06/15/2002  
Neuropsychologist, Good Samaritan Hospital, 01/01/1980-01/01/1982  
Intern, Huntington Memorial Hospital, 01/01/1978-01/01/1979  

Description of Research

Summary Statement of Research Interests

My recent research has focused on neural mechanisms for encoding of shape information. I have found that briefly displayed shape cues can be combined to allow recognition of shapes, and that submillisecond timing differences can impair the recognition. There is evidence that the timing differences are being registered by retinal neurons. These mechanisms may provide for identification of heavily occluded shapes, such as an object moving behind dense vegetation, where simultaneous transitions provide the only recognition cues.

The research makes use of a custom designed 64x64 LED display board that allows for microsecond control over each of the LEDs. Each shape is specified as address positions along the major contours, often using only the outer boundary of the shape. The shape inventory includes amphibians, fish, birds, mammals, furniture, tools, vehicles and various other objects. A key requirement for inclusion in the inventory is that the shape be namable when the dots marking the major boundaries have been briefly displayed.

The work done thus far has been reported in two on-line journals – Behavioral and Brain Functions, and PLoS ONE -- as shown in the publications list below. Each article can be accessed by clicking the link labeled “on-line access” that follows each citation.


Research Keywords

object recognition, shape recognition, shape encoding, retinal mechanisms, visual illusions, visual space

Affiliations with Research Centers, Labs, and Other Institutions

Neuropsychology Foundation, Los Angeles, Chief Financial Officer


Journal Article

Greene, E. (2014). Shape recognition elicited by microsecond flashes is not based on photon quantity. i-Perception/Pion. Vol. 5 (2), pp. 87-93.
Greene, E. (2013). Violation of Bloch's law that specifies reciprocity of intensity and duration with brief light flashes. i-Perception / Pion. Vol. 4 (8) PubMed Web Address
Greene, E., Ogden, R. T. (2013). Shapes displayed with durations in the microsecond range do not obey Bloch's law of temporal summation. i-Perception / Pion. Vol. 4, pp. 429-436.
Greene, E., Ogden, T. (2012). Evaluating shape recognition using the minimal transient discrete cue protocol. Behavioral & Brain Functions, BioMed Central. Vol. 8 (53), pp. 14.
Ogden, T., Greene, E. (2010). Wavelet modeling of functional random effects with application to human vision. Journal of Statistical Planning and Inference/Elsivier. Vol. 140, pp. 3797-3808.
Greene, E. (2008). Wavelet modeling of collinearity judgment errors. British Journal of Mathematical and Statistical Psychology / British Psychological Society. Vol. 61, pp. 189-210.
Greene, E. (2008). Additional evidence that contour attributes are not essential cues for object recognition. Behavioral & Brain Functions, BioMed Central. Vol. 4, pp. e26 (9 pages).
Greene, E. (2007). Retinal encoding of ultrabrief shape recognition cues. PLoS ONE / Public Library of Science. Vol. 2, pp. e871 (10 pages). on-line access
Greene, E. (2007). Spatial and temporal proximity as factors in shape recognition. Behavioral & Brain Functions / BioMed Central. Vol. 3, pp. e27 (10 pages). on-line access
Greene, E. (2007). The integration window for shape cues is a function of ambient illuminations. Behavioral & Brain Functions / BioMed Central. Vol. 3, pp. e15 (11 pages). on-line access
Greene, E. (2007). The role of visible persistence for mediating the temporal integration of shape cues. Perception & Psychophysics / Psychonomic Society. Vol. 69, pp. 772-784.
Greene, E. (2007). Recognition of objects that are displayed with incomplete sets of border dots. Perceptual and Motor Skills / Ammons Scientific. Vol. 104, pp. 1043-1059.
Greene, E. (2006). Simultaneity in the millisecond range as a requirement for effective shape recognition. Behavioral & Brain Functions, BioMed Central. Vol. 2, pp. e38 (14 pages). on-line access
Greene, E. (2005). Do rotation coordinates provide the substrate for a mental protractor?. Perception/Pion. Vol. 39, pp. 1339-1352.
Greene, E. (2003). Mapping is not sufficient to specify position in visual space. Perceptual and Motor Skills/Ammons Scientific. Vol. 97., pp. 97-98.
Greene, E., Fraser, S. (2002). Observation distance and recognition of celebrities' faces. Perceptual and Motor Skills, Ammons Scientific. Vol. 95, pp. 637-651.
Greene, E., Gentner, S. (2001). Further consideration of size illusions in random dot stereograms. Perceptual and Motor Skills / Ammons Scientific. Vol. 03, pp. 205-212.
Greene, E., Frawley, W. (2001). Evaluating models of collinearity judgment for reliability and scale. Pion Press. Vol. 30, pp. 543-558.
Greene, E., Frawley, W. (2001). Idiosyncratic profiles of collinearity error using segments and dot pairs. Psychological Research / Springer. Vol. 65, pp. 260-278.

Honors and Awards

Charter Fellow, Association for the Advancement of Preventive Psychology, 1992-  
Life Fellow, American Psychological Association (Division 3, Experimental), 1992-  
Life Fellow, American Psychological Association, (Division 6, Physiological), 1991-  
American Association for the Advancement of Science Fellow, Life Fellow, American Association for the Advancement of Science, 1990-  
Charter Fellow, Association for Psychological Science, 1989-  
Life Fellow, American Psychological Association, (Division 1, General), 1989-  
Elected membership, National Academy of Neuropsychology, 1988-  

Service to the Profession

Editorships and Editorial Boards

Academic Editor, PLoS ONE, 2007-2008   
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