Chen Chi, de Hoz Livia
Department of Neurogenetics, Max Planck Institute for Experimental Medicine, Göttingen, Germany.
International Max Planck Research School for Neurosciences, Göttingen, Germany.
iScience. 2023 May 22;26(6):106941. doi: 10.1016/j.isci.2023.106941. eCollection 2023 Jun 16.
As we interact with our surroundings, we encounter the same or similar objects from different perspectives and are compelled to generalize. For example, despite their variety we recognize dog barks as a distinct sound class. While we have some understanding of generalization along a single stimulus dimension (frequency, color), natural stimuli are identifiable by a combination of dimensions. Measuring their interaction is essential to understand perception. Using a 2-dimension discrimination task for mice and frequency or amplitude modulated sounds, we tested untrained generalization across pairs of auditory dimensions in an automatized behavioral paradigm. We uncovered a perceptual hierarchy over the tested dimensions that was dominated by the sound's spectral composition. Stimuli are thus not perceived as a whole, but as a combination of their features, each of which weights differently on the identification of the stimulus according to an established hierarchy, possibly paralleling their differential shaping of neuronal tuning.
当我们与周围环境互动时，我们会从不同角度遇到相同或相似的物体，从而不得不进行概括。例如，尽管狗叫声多种多样，但我们仍将其识别为一个独特的声音类别。虽然我们对单一刺激维度（频率、颜色）上的概括有一定了解，但自然刺激是由多个维度的组合来识别的。测量它们之间的相互作用对于理解感知至关重要。我们使用针对小鼠的二维辨别任务以及频率或幅度调制声音，在自动化行为范式中测试了未经训练的跨听觉维度对的概括能力。我们发现，在所测试的维度上存在一种感知层次结构，该结构由声音的频谱组成主导。因此，刺激并非被整体感知，而是被视为其特征的组合，根据既定的层次结构，每个特征在刺激识别中所占权重不同，这可能与它们对神经元调谐的不同塑造方式平行。
