A computational model of early language acquisition from audiovisual experiences of young infants
This addresses the challenge of early language acquisition for developmental psychology and AI, but it is incremental as it builds on existing multimodal bootstrapping hypotheses.
The paper tackled the problem of whether infants can learn words from ambiguous audiovisual experiences by developing a neural network model that learns word segments and meanings from real infant-caregiver recordings, showing that lexical knowledge can emerge from such scenarios and that hidden layers develop phonetic selectivity.
Earlier research has suggested that human infants might use statistical dependencies between speech and non-linguistic multimodal input to bootstrap their language learning before they know how to segment words from running speech. However, feasibility of this hypothesis in terms of real-world infant experiences has remained unclear. This paper presents a step towards a more realistic test of the multimodal bootstrapping hypothesis by describing a neural network model that can learn word segments and their meanings from referentially ambiguous acoustic input. The model is tested on recordings of real infant-caregiver interactions using utterance-level labels for concrete visual objects that were attended by the infant when caregiver spoke an utterance containing the name of the object, and using random visual labels for utterances during absence of attention. The results show that beginnings of lexical knowledge may indeed emerge from individually ambiguous learning scenarios. In addition, the hidden layers of the network show gradually increasing selectivity to phonetic categories as a function of layer depth, resembling models trained for phone recognition in a supervised manner.