DYNAMIC INTERACTIONS BETWEEN ACCOMMODATION AND CONVERGENCE ARE VELOCITY SENSITIVE
DYNAMIC INTERACTIONS BETWEEN ACCOMMODATION AND CONVERGENCE ARE VELOCITY SENSITIVE
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DOI：
10.1016/0042-6989(86)90151-3
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发表时间：
1986-01-01
期刊：
影响因子：
1.8
通讯作者：
KOTULAK, JC
中科院分区：
文献类型：
--
作者：
SCHOR, CM;KOTULAK, JC
调节和聚散的后效分别在适应镜片和棱镜约1分钟后发生。这一观察结果可以解释为意味着调节和聚散反应具有相位和紧张成分。我们已经研究了这些建议的子组件在调节和聚散之间的相互作用中发挥的作用。在离焦和视差的低时频变化（<0.1Hz）下，视向聚散（AV）和聚散调节（VA）均无反应。然而，AV和VA都对较高的时间频率刺激（高达0.5 Hz）有反应。当对刺激系统的负反馈被电子取消时，AV和VA都对低时间频率刺激有反应。视向性聚散/调节（AC/A）和聚散调节/聚散（CA/C）的比值或增益随刺激幅度的增加呈非线性增加。刺激AV可产生聚散后效应，刺激VA可产生趋散后效应。这些结果被解释为意味着AC/A比率的幅度和所提出的调节的紧张性适应之间以及CA/C比率的幅度和所提出的聚散的紧张性适应之间可能存在互补关系。强直适应的低饱和极限或刺激窗口可以解释AC/A和CA/C比的幅度依赖性非线性。
Aftereffects of accommodation and vergence occur following approximately 1 min of adaptation to lenses and prisms respectively. This observation can be interpreted to mean that accommodation and vergence responses have phasic and tonic components. We have examined the role that these proposed subcomponents play in mutual interactions between accommodation and vergence. Both accommodative vergence (AV) and vergence accommodation (VA) were unresponsive to low temporal frequency variations (< 0.1 Hz) in defocus and disparity respectively. However, both AV and VA were responsive to higher temporal frequency stimuli (up to 0.5 Hz). When negative feedback to the stimulated system was cancelled electronically, both AV and VA become responsive to low temporal frequency stimuli. The ratio or gain of accommodative vergence/accommodation (AC/A) and vergence accommodation/vergence (CA/C) increased nonlinearly with stimulus amplitude. Vergence aftereffects resulted from stimulation of AV and accommodative aftereffects resulted from stimulation of VA. These results are interpreted to mean there could be a complementary relationship between the amplitude of the AC/A ratio and proposed tonic adaptation of accommodation, and between the amplitude of the CA/C ratio and proposed tonic adaptation of vergence. A low saturation limit or stimulus window for tonic adaptation may account for the amplitude dependent nonlinearities of the AC/A and CA/C ratios.