Teaching by Examples: Implications for the Process of Category Acquisition

A new paradigm, the 'teaching-by-examples' paradigm, was used to shed new light on the process of category acquisition. In four experiments ( n = 90, 90, 115, 117), manipulating the variables of category structure, status of non-target category, learning mode, and teaching mode, participants first learned a category and then taught it to someone else. High agreement between participants on the teaching sequences was found across conditions, and a typical sequence was identified for each category structure. The typical participant-produced sequences startedwith several ideal positive cases, followed by anideal negative case and then borderline cases. The efficiency of such sequences for teaching was tested in another experiment ( n = 60), in which they were compared with sequences emphasizing category borders and sequences emphasizing each dimension separately. The typical participant-produced sequences induced the most efficient learning. It is proposed that the pattern of performance may provide a rich source of data for testing and fine-tuning models of category acquisition.     

Father–child and mother–child interaction in families with a child feeding disorder: The role of paternal involvement

To date, research about feeding disorder (FD) has focused almost exclusively on the mother–child dyad, ignoring fathers' roles. The current study investigated father–child interactions with children having FD. The sample consisted of 67 children (1–3 years old) and their mothers and fathers. Thirty‐four children, diagnosed with a nonorganic‐based FD (FD group) and 33 children without an FD (control group) were matched for age, gender, birth order, and maternal education. Data were collected during home visits. Mothers were interviewed about their and the father's involvement in childcare. In addition, mother–child and father–child interactions were videotaped during play and feeding. Both mothers and fathers from the FD group experienced less positive parent–child interactions than did parents in the control group. Furthermore, mothers in the FD group reported greater maternal versus paternal childcare involvement than did control group mothers. Finally, FD group mothers exhibited more parental sensitivity than did fathers during feeing interactions; however, this difference was observed only when coupled with low paternal involvement. In families where fathers were highly involved, no difference was evident in paternal and maternal sensitivity. These findings highlight the importance of fathers' involvement, especially in families with children exhibiting an FD.