Patterns of Adaptation in Child-Directed and Child Speech in the Emergence of Hebrew Verbs

Children approach verb learning in ways that are specific to their native language, given the differential typological organization of verb morphology and lexical semantics. Parent-child interaction is the arena where children's socio-cognitive abilities enable them to track predictive relationships between tokens and extract linguistic generalizations from patterns and regularities in the ambient language. The current study examines how the system of Hebrew verbs develops as a network over time in early childhood, and the dynamic role of input-output adaptation in the network's increasing complexity. Focus is on the morphological components of Hebrew verbs in a dense corpus of two parent-child dyads in natural interaction between the ages 1;8-2;2. The 91-hour corpus contained 371,547 word tokens, 62,824 verb tokens, and 1,410 verb types (lemmas) in CDS and CS together. Network analysis was employed to explore the changing distributions and emergent systematicity of the relations between verb roots and verb patterns. Taking the Semitic root and pattern morphological constructs to represent linked nodes in a network, findings show that children's networks change with age in terms of node degree and node centrality, representing linkage level and construct importance respectively; and in terms of network density, as representing network growth potential. We put forward three main hypotheses followed by findings concerning (i) changes in verb usage through development, (ii) CS adaptation, and (iii) CDS adaptation: First, we show that children go through punctuated development, expressed by their using individual constructs for short periods of time, whereas parents' patterns of usage are more coherent. Second, regarding CS adaptation within a dynamic network system relative to time and CDS, we conclude that children are attuned to their immediate experience consisting of current CDS usage as well as previous usage in the immediate past. Finally, we show that parents (unintentionally) adapt to their children's language knowledge in three ways: First, by relating to their children's current usage. Second, by expanding on previous experience, building upon the usage their children have already been exposed to. And third, we show that when parents experience a limited network in the speech of their children, they provide them with more opportunities to expand their system in future interactions.

Complexity and density of Hebrew verbs in preschool peer talk

Hebrew verbs were analyzed in the peer talk produced by 36 Hebrew-speaking children in two age/schooling groups (4;0–5;0 and 5;0–6;0 years), and from two socio-economic backgrounds (SES), mid-high and low. Each of the four age/SES groups consisted of nine children in three triads, where each triad was recorded for 30 minutes while playing. The interface of lexical and morphological growth was demonstrated in the developing organization of verbs in terms of roots, binyan conjugations and derivational families. SES was found the major source of variation in all measures, indicating a smaller and less specific verb lexicon in the low SES groups. Network analyses, a novel methodological approach, revealed the internal structure of the verb category in each age/SES cell, pointing to a scarce and less complex verb lexicon of the low SES groups. These measures also accounted for the growth potential of the network, increasing from the younger low SES group at one pole and peaking in the older mid-high SES at the other pole. These quantitative and qualitative differences in the morphological make-up of the verb lexicon and its usage patterns in preschool peer talk have implications for the impact of SES on verb learning in Hebrew.

Consonant co-occurrence restrictions in Modern Hebrew

The paper presents consonant co-occurrence restrictions in Hebrew, focusing on the influence of the similarity factor. A lexical analysis of Hebrew verbs reveals tendency to avoid similar, close consonants, by showing a highly significant correlation (p<0.0001) between co-occurrence of C1-C2 sequences in the lexicon and similarity factors (based on Frisch et al.’s 2004 model for similarity, adjusted to Hebrew). In other words, the more two consonants are similar to each other, the smaller their chances are to co-occur as C1-C2 in a Hebrew verb. In addition, a major role of place of articulation is observed, such that consonants that share major place of articulation are less likely to co-occur. However, the highly significant correlation between co-occurrences and similarity factors suggests that not only major place of articulation affects the restrictions; otherwise we would wrongly predict no effect in non-homorganic pairs.