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A bio-inspired attention model of anticipation in gaze-contingency experiments with infants

机译:婴儿注视应急实验中受生物启发的预期注意力模型

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The empirical investigation of cognitive processes in infants is hampered by the limited development of their body and motor control skills. Novel gaze-contingent paradigms where infants control their environment with their eyes offer a solution to this problem since the control of gaze develops very early. Recently such a paradigm has been used to investigate the learning of anticipatory behaviour of 6/8-months-old infants in an experiment where gazing at a “button” causes the appearance of an interesting image. The experiment shows that infants learn in few trials to “press the button” with their gaze and, remarkably, to anticipate the image appearance in only few trials. The experiment raises two questions: (a) what are the processes supporting such fast learning? (b) why does the anticipatory behaviour emerge? This paper presents a bio-inspired model that puts forward possible answers to these questions. The model consists of: (a) a bottom-up attention component for scene saliency detection; (b) a top-down attention component that uses reinforcement learning (RL) to learn to control gaze based on current foveal stimuli; (c) a dynamic field map that decides where to look based on the bottom-up and top-down information. The results show that the model is indeed capable of learning to perform anticipatory saccades in few trials. The analysis of the system shows that this fast learning is due to the guidance exerted by the bottom-up component on the learning process of the top-down component.Moreover, it shows that the anticipatory behaviour can be explained in terms of the action of the top-down component exploiting the learned spatial relations of stimuli in an anticipatory fashion. Overall, the results indicate that the model has the essential features to theoretically frame, interpret, and design experiments using gaze contingency.
机译:婴幼儿认知过程的实证研究受到其身体和运动控制技能发展有限的阻碍。由于凝视控制发展很早,因此婴儿可以用眼睛控制周围环境的新型凝视偶然性范式提供了解决方案。最近,在一个注视“按钮”导致出现有趣图像的实验中,这种范例已用于研究6/8个月大婴儿的预期行为。实验表明,婴儿在很少的试验中学会了凝视“按下按钮”,并且值得注意的是,只有很少的试验可以预期图像的外观。实验提出了两个问题:(a)支持这种快速学习的过程是什么? (b)为什么出现预期行为?本文提出了一个生物启发的模型,为这些问题提出了可能的答案。该模型包括:(a)自下而上的注意力组件,用于场景显着性检测; (b)自上而下的注意力成分,它使用强化学习(RL)来学习根据当前的中央凹刺激来控制注视; (c)动态场图,它根据自下而上和自上而下的信息来决定要看的地方。结果表明,该模型确实能够在很少的试验中学习执行预期的扫视。系统分析表明,这种快速学习是由于自下而上的组件在自上而下的组件的学习过程中施加的指导,此外,它还表明预期行为可以用行为的解释来解释。自上而下的组件以预期的方式利用学习到的刺激的空间关系。总体而言,结果表明该模型具有从理论上使用视线偶然性进行框架,解释和设计实验的基本功能。

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