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采用多目标追踪(MOT)与点探测刺激觉察任务相结合的实验范式,分别通过改变运动与静止非目标数量,考察追踪难度变化对不同类型非目标选择性抑制的影响。实验一通过改变运动非目标数量为4、5、6,发现当运动非目标数量为6时,追踪难度显著增加,静止非目标上的抑制量也显著增加,而运动非目标上的抑制量则不随追踪难度的变化而变化;实验二改变静止非目标数量为4、5、6,同样发现当静止非目标数量为6时,追踪难度显著增加,静止非目标上的抑制量也显著增加,而运动非目标上的抑制量仍不随追踪难度的变化而变化,且当静止非目标数量为6时,静止非目标上的抑制量显著大于运动非目标,出现了反转现象,其原因可能是视野范围内总的对象数量超出了视觉索引容量,被试改变了对静止与运动非目标的抑制策略。综合实验结果表明,静止非目标上的抑制程度随追踪难度的提高而增加;而运动非目标上的抑制程度对追踪难度的变化不敏感,在不同难度水平上保持相对稳定。
The experimental paradigm of multi-target tracking (MOT) and point-detection stimulus task was used to investigate the influence of tracking difficulty on different types of non-target selective inhibition by changing the number of non-target moving and stationary. In the first experiment, by changing the number of non-target 4, 5 and 6, it was found that when the number of non-target 6 was moving, the difficulty of tracking was significantly increased, while the inhibition of resting non-target was also significantly increased. However, In the second experiment, the number of quiescent non-targets was changed to 4, 5 and 6, and it was also found that when the number of quiescent and non-targets was 6, the tracking difficulty was significantly increased and the quiescent non-targets also significantly increased The amount of inhibition on non-target of motion still does not change with the difficulty of tracking, and when the number of static at non-target is 6, the inhibition on static non-target is significantly larger than that of non-target at motion, which may be due to the field of view The total number of objects in the range exceeded the visual index, and participants changed their strategy of restraining non-stationary and non-moving objects. The experimental results show that the degree of inhibition on stationary non-target increases with the difficulty of tracking, while the inhibition on non-target is insensitive to the change of tracking difficulty and remains relatively stable at different difficulty levels.