Thesis etd-11192018-214856 |
Link copiato negli appunti
Thesis type
Tesi di laurea magistrale
Author
MANCARI, ALESSANDRO
URN
etd-11192018-214856
Thesis title
Parametric responses to binocular depth in human visual cortex
Department
BIOLOGIA
Course of study
NEUROSCIENCE
Supervisors
relatore Prof.ssa Morrone, Maria Concetta
tutor Prof. Parker, Andrew J.
tutor Prof. Parker, Andrew J.
Keywords
- binocular disparity
- fMRI
- human visual cortex
- pedestal depth
- population receptive field
- psychophysics
- random dot stereograms
- stereopsis
Graduation session start date
10/12/2018
Availability
Withheld
Release date
10/12/2088
Summary
The neural processing of binocular disparity is one of the main mechanisms allowing three-dimensional (3D) vision in humans, and it takes place in the cerebral cortex. By using functional Magnetic Resonance Imaging (fMRI), it is possible to model neuronal receptive fields averaged over a population of the order of hundreds of thousands of neurons (population receptive field, pRF). The aim of this project was therefore to characterize disparity pRFs organization and response properties, i.e. the variability in tuning curve profiles, regarding in particular the nature of the response (tuned/categorical) and tuning width, in most visual areas currently known (V1, V2, V3, V4, VOC, LO1-2, V3A-B, TO1-2, V7), and assess how they relate to depth perception.
We found that disparity pRFs are organized in accordance with the Weber-Fechner law, for both correlated and anticorrelated disparity stimuli. In the first case, however, we estimated significantly smaller Weber fractions in almost all areas. We also report that pRF tuning width in areas VOC and V3AB is a strong predictor of perceptual stereoacuity threshold.
File
Nome file | Dimensione |
---|---|
Thesis not available for consultation. |