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首页> 外文期刊>Journal of vision >Weakened Target Representations in Low Prevalence Visual Search
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Weakened Target Representations in Low Prevalence Visual Search

机译：低普及率视觉搜索中的目标表示能力弱

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We examined the strength of activation of different target templates during a dual-target visual search task. We manipulated the proportion of trials where each target was presented (known as the target prevalence) in order to assess whether target templates are shaped by regularities in the environment. We recorded participantsa?? eye movement behaviour as they searched for two targets, one of which appeared on 45% of trials (TH) while the other appeared on 5% of trials (TL). We sought to determine whether guidance or identification processes (or both) were weakened by a reduction in target prevalence. Response accuracy data demonstrated that participants were less likely to detect TL than TH, replicating the prevalence effect. Analyses of eye movement behaviour indicated that guidance was weakened in low prevalence: participants were both less likely, and less rapid, to fixate distractors that shared their colour with TL than TH. Furthermore, identification processes in low prevalence search were also shown to be weakened, with the time between first fixating TL and responding a??presenta?? being longer than the time between first fixating TH and responding a??presenta??. Taken together, these results demonstrate that low target prevalence weakens target templates, both for guidance and recognition. This finding accounts for previous results, in which participants to fail to detect low prevalence targets, by showing that participants are less likely to fixate target objects, and, when they do, more time is required in order to identify those objects.
机译：我们研究了在双目标视觉搜索任务中激活不同目标模板的强度。为了评估目标模板是否受环境规律影响，我们操纵了提出每个目标的试验比例（称为目标患病率）。我们记录了参与者a？他们寻找两个目标时的眼球运动行为，其中一个出现在45％的试验（TH）中，而另一个出现在5％的试验（TL）中。我们试图确定目标流行率的降低是否削弱了指导或识别过程（或两者）。响应准确性数据表明，参与者比TH不太可能检测到TL，从而复制了患病率。对眼球运动行为的分析表明，在低患病率中，指导作用减弱：参与者固定并与TL共享颜色的干扰物的可能性和速度均不如TH。此外，低流行度搜索中的识别过程也被削弱，这是在第一次固定TL和响应“ presenta”之间的时间。比第一次固定TH和响应“ presenta”之间的时间更长。综上所述，这些结果表明，低目标流行率会削弱目标模板，无论是指导还是识别。这一发现说明了以前的结果，在这些结果中，参与者显示出参与者固定目标对象的可能性较小，因此未能检测到低患病率的目标，而当他们这样做时，需要更多的时间来识别那些目标。

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