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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2011.1
- 수록면
- 48 - 53 (6page)
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Purpose: The purpose of this study was to investigate the effects of contrast display exposure on neuronal directional and spatial frequency tuning. Neuronal responses were recorded from ninety-four neurons in cortical areas 17 and 18 in two adult cats.
Methods: A multi-channel microelectrode was implanted in cortical areas 17 and 18 of two paralyzed and anaesthetized cats. Various drifting sinusoidal grating contrast displays were presented to one of the cats’ eyes in the visual field. Contour plots based on the neuronal responses to the drifting sinusoidal grating displays using various contrasts (i.e., 0.4, 0.7, and 1.0) and velocities (i.e., 4.6, 13.9, 23.1, 32.3, 41.5, 50.8, and 60.0 deg/sec) were plotted as a function of the spatial frequency and the direction associated with each velocity and contrast used.
Results: Five parameters were extracted from these contour plots: 1) optimum response, 2) preferred direction, 3)optimum spatial frequency, 4) directional tuning width, and 5) spatial frequency bandwidth. To determine the optimal velocity, each parameter was plotted against each of the specific display contrasts used, and a ‘best fit’ line was established. Response amplitudes were dependent on the type of contrast utilized; however, the spatial frequency and directional tuning properties were stable for the cortical neurons assessed.
Conclusions: The results of the presentation of different contrasts on neuronal directional and spatial frequency tuning are consistent with behavioral results when medium and high contrast displays are used.
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참고문헌 (25)
참고문헌 신청
Albrecht DG / 1982 / Striate cortex of monkey and cat:contrast response function / J Neurophysiol 48 : 217 ~ 237
Alitto HJ / 2004 / Influence of contrast on orientation and temporal frequency tuning in ferret primary visual cortex / J Neurophysiol 91 : 2797 ~ 2808
Anderson JS / 2000 / The contribution of noise to contrast invariance of orientation tuning in cat visual cortex / Science 290 : 1968 ~ 1972
Campbell FW / 1968 / The angular selectivity of visual cortical cells to moving gratings / J Physiol 198 : 237 ~ 250
Campbell FW / 1969 / The spatial selectivity of the visual cells of the cat / J Physiol 203 : 223 ~ 235
Alitto HJ / 2004 / Influence of contrast on orientation and temporal frequency tuning in ferret primary visual cortex / J Neurophysiol 91 : 2797 ~ 2808
Anderson JS / 2000 / The contribution of noise to contrast invariance of orientation tuning in cat visual cortex / Science 290 : 1968 ~ 1972
Campbell FW / 1968 / The angular selectivity of visual cortical cells to moving gratings / J Physiol 198 : 237 ~ 250
Campbell FW / 1969 / The spatial selectivity of the visual cells of the cat / J Physiol 203 : 223 ~ 235
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