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Description
Paper
Link: https://www.sciencedirect.com/science/article/abs/pii/S1388245709005343
Year: 2009
Summary
- results indicated that dichoptic evoked potentials using multifocal frequency-doubling illusion stimuli are practical. The use of crossed orientation, or differing spatial frequencies, in the two eyes reduced binocular interactions.
Methods
- incommensurate stimulus frequencies ranged from 15.45 to 21.51 Hz. Five stimulus con- ditions differing in spatial frequency and orientation were examined for three viewing conditions. The resulting 15 stimulus conditions were examined in 16 normal subjects
- 15 experimental conditions were examined
- primary stimulus parameter was the viewing condition: monocular left eye, monocular right eye and dichoptic viewing
- secondary conditions involved manipulation of the spatial frequency or orien- tation of the individual grating stimuli to produce five variant stimulus conditions
- Responses to each region were extracted by a fast Fourier transform
Results
Results show that monocular conditions had comparatively larger amplitudes than dichoptic conditions, responses in the right monocular eye being the largest, and responses from the inner regions are comparatively larger than those from the outer regions. The responses were dominated by second harmonic responses, and some significant interaction frequencies were also observed. In the context of automated perimetry in glaucoma patients, while dichoptic viewing has a potential advantage over monocular viewing in terms of reduced testing time, that advantage could be nullified by binocular suppression [^meese2004low].