Center for Mind/Brain Sciences, University of Trento, Piazza Manifattura, 1, 38068, Rovereto, TN, Italy.
Sci Rep. 2020 Apr 14;10(1):6277. doi: 10.1038/s41598-020-63428-3.
It has been recently reported that young chicks that have received equal exposure to slowly- and fast-rotating objects showed a preference for slowly-rotating objects. This would suggest that visual experience with slowly moving objects is necessary for object recognition in newborns. I attempted to duplicate this finding in newborn chicks using a simple rotating blue cube. No significant preference was found. Using objects similar to the ones used in the previous study (digital embryos), I observed a strong and robust preference for the fast- (not for the slow-) rotating object. To clarify whether the discrepancies with the previous study could be due to the stimuli frame-frequency used (the chicks' visual system is characterized by high temporal resolution), I repeated the experiments by presenting the stimuli with a lower-frame frequency (from 120 fps to 24 fps). However, similar preferences for the fast-rotating objects were found, this time also for the rotating blue cube. These results suggest a preference for fast-rotating objects that is modulated by the shape and, in part, by the frame-frequency. It remains to be established whether the discrepancies between this study and the previous study can be explained by differences related to strains or artefacts due to the use of monitors with a low-refresh rate.
最近有报道称，接受过匀速和高速旋转物体同等暴露的小鸡表现出对匀速旋转物体的偏好。这表明，对于新生儿来说，视觉经验与缓慢移动的物体是识别物体所必需的。我试图在新生小鸡中使用简单的旋转蓝色方块重复这一发现。但没有发现明显的偏好。使用与之前研究中使用的类似物体（数字胚胎），我观察到小鸡对高速（而不是低速）旋转物体有强烈而明显的偏好。为了澄清与之前研究的差异是否可能是由于所使用的刺激帧率不同（小鸡的视觉系统具有高时间分辨率），我通过以较低的帧率（从 120 fps 到 24 fps）呈现刺激物来重复实验。然而，仍发现了对高速旋转物体的类似偏好，这次也适用于旋转的蓝色方块。这些结果表明，对高速旋转物体的偏好受到形状的调制，部分也受到帧率的调制。目前尚不清楚本研究与之前研究之间的差异是否可以通过与使用低刷新率监视器相关的品系差异或由于使用低刷新率监视器而产生的伪影来解释。
