Bergerbest Dafna, Shilkrot Orit, Joseph Michal, Salti Moti
School of Behavioral Sciences, The Academic College of Tel-Aviv-Yaffo, Tel Aviv-Yafo, 6818211, Israel.
Brain Imaging Research Center, Ben-Gurion University of the Negev, Beer-Sheva, 8410501, Israel.
Atten Percept Psychophys. 2017 Oct;79(7):1979-1992. doi: 10.3758/s13414-017-1356-z.
When two targets are presented in a rapid serial visual presentation (RSVP), recognition of the second target (T2) is usually reduced when presented 150-500 ms after the first target, demonstrating an attentional blink (AB). Previous studies have shown a left visual-field (LVF) advantage in T2 recognition, when T2 was embedded in one of two streams, demanding top-down attention for its recognition. Here, we explored the impact of bottom-up saliency on spatial asymmetry in the AB. When T2 was spatially shifted outside from the RSVP, creating an abrupt onset of T2, right T2s showed a right visual-field (RVF) advantage. In lag-1 trials, right T2s were not only better recognized, but also showed a low T1-T2 order error rate. In contrast, recognized left T2s exhibited high order error rate. Without abrupt onset, symmetrical AB was found and order error rate was similarly low in both sides. Follow-up experiments showed that, while RVF advantage was related to bottom-up saliency, order errors were affected by T1 mask. The discrepancy between LVF and RVF advantage in the AB could be resolved in terms of two mechanisms of attentional gating: top-down attentional gating, which is biased towards LVF, and bottom-up attentional gating, which is biased towards RVF.
当在快速序列视觉呈现（RSVP）中呈现两个目标时，第二个目标（T2）在第一个目标之后150 - 500毫秒呈现时，其识别通常会降低，这表明存在注意瞬脱（AB）。先前的研究表明，当T2嵌入两个流之一中，需要自上而下的注意来进行识别时，在T2识别中存在左视野（LVF）优势。在此，我们探究了自下而上的显著性对AB中空间不对称性的影响。当T2在空间上从RSVP中移位，从而使T2突然出现时，右侧T2表现出右视野（RVF）优势。在滞后1试验中，右侧T2不仅识别得更好，而且T1 - T2顺序错误率也较低。相比之下，被识别的左侧T2表现出较高的顺序错误率。在没有突然出现的情况下，发现了对称的AB，并且两侧的顺序错误率同样较低。后续实验表明，虽然RVF优势与自下而上的显著性有关，但顺序错误受T1掩蔽的影响。AB中LVF和RVF优势之间的差异可以根据注意门控的两种机制来解释：偏向LVF的自上而下的注意门控和偏向RVF的自下而上的注意门控。
