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PSYCHOPHYSICALLY DEFINED GAIN CONTROL POOL AND SUMMING CIRCUIT BANDWIDTHS IN SELECTIVE PATHWAYS

Hibbeler, Patrick Joseph

Abstract Details

2008, Master of Arts, Miami University, Psychology.
Olzak and Thomas (1999 Vision Research 39 231 - 235) proposed a model of early to mid-level cortical vision containing two parallel summing circuits. One was an edge detector (cigars); the other was a surface grain/texture detector (doughnuts). A nonlinear gain control pool preceded both. The current study was focused on measuring the bandwidth of the gain control pool and the bandwidths of the cigars and doughnuts, using orientation and spatial frequency discrimination, respectively. Stimuli were simple or complex luminance-defined gratings with their Fourier dimensions configured in such a manner to single out the appropriate pathway. To isolate the gain control pool we measured the effects of superimposed masks, differing widely in spatial frequency or orientation, and varied the spatial frequency or orientation of the mask in order to estimate bandwidth. To isolate summing circuit bandwidths we added a second cue and configured it in one of two ways. We then measured the difference in performance between these two configurations. Results indicate broad gain control pools and more narrowly tuned summing circuits.
Lynn Olzak, Dr. (Committee Chair)
Robin Thomas, Dr. (Committee Member)
Stephen Berry, Dr. (Committee Member)
31 p.

Recommended Citations

Citations

  • Hibbeler, P. J. (2008). PSYCHOPHYSICALLY DEFINED GAIN CONTROL POOL AND SUMMING CIRCUIT BANDWIDTHS IN SELECTIVE PATHWAYS [Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami1227295136

    APA Style (7th edition)

  • Hibbeler, Patrick. PSYCHOPHYSICALLY DEFINED GAIN CONTROL POOL AND SUMMING CIRCUIT BANDWIDTHS IN SELECTIVE PATHWAYS. 2008. Miami University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami1227295136.

    MLA Style (8th edition)

  • Hibbeler, Patrick. "PSYCHOPHYSICALLY DEFINED GAIN CONTROL POOL AND SUMMING CIRCUIT BANDWIDTHS IN SELECTIVE PATHWAYS." Master's thesis, Miami University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=miami1227295136

    Chicago Manual of Style (17th edition)