Blake Randolph, Goodman Rachel, Tomarken Andrew, Kim Hyun-Woong
Department of Psychology, Vanderbilt University, Nashville, TN 37212, USA; Vanderbilt Vision Research Center, Nashville, TN 37212, USA.
Department of Psychology, Vanderbilt University, Nashville, TN 37212, USA.
Vision Res. 2019 Jul;160:10-23. doi: 10.1016/j.visres.2019.04.003. Epub 2019 May 7.
Binocular rivalry (BR) and continuous flash suppression (CFS) are compelling psychophysical phenomena involving interocular suppression. Using an individual differences approach we assessed whether interocular suppression induced by CFS is predictable in potency from characteristics of BR that are plausibly governed by interocular inhibition. We found large individual differences in BR dynamics and, in addition, in the strength of CFS as gauged by the incidence and durations of breakthroughs in CFS during an extended viewing periods. CFS's potency waned with repeated trials, but stable individual differences persisted despite these mean shifts. We also discovered large individual differences in the strength of the post-CFS shift in BR dominance produced by interocular suppression. While CFS breakthroughs were significantly negatively correlated with shifts in BR dominance after CFS, there were no significant associations between individual differences in alternation rate during pre-CFS binocular rivalry and either breakthroughs during CFS or post-CFS dominance shifts. Bayesian hypothesis tests and highest posterior density intervals confirmed the weak association between these two forms of interocular suppression. Thus, our findings suggest that the substantial individual differences in BR dynamics and CFS effectiveness are modestly related but not entirely mediated by one common neural substrate.
双眼竞争（BR）和连续闪光抑制（CFS）是涉及双眼间抑制的引人注目的心理物理学现象。我们采用个体差异方法，评估了由CFS诱导的双眼间抑制在效力上是否可根据可能受双眼间抑制支配的BR特征进行预测。我们发现BR动态存在很大的个体差异，此外，在延长的观察期内，通过CFS突破的发生率和持续时间衡量的CFS强度也存在个体差异。CFS的效力在重复试验中减弱，但尽管有这些均值变化，稳定的个体差异仍然存在。我们还发现，双眼间抑制产生的CFS后BR优势转移强度存在很大的个体差异。虽然CFS突破与CFS后BR优势转移显著负相关，但CFS前双眼竞争期间交替率的个体差异与CFS期间的突破或CFS后优势转移之间均无显著关联。贝叶斯假设检验和最高后验密度区间证实了这两种双眼间抑制形式之间的弱关联。因此，我们的研究结果表明，BR动态和CFS有效性中的个体差异虽有适度关联，但并非完全由一个共同的神经基质介导。
