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During Experiment 2 we attempted to further investigate the relative ease and difficultness of equivalence class formation using stimuli that were either (a) novel and neutral, (b) presumably extraexperimentally nonequivlant (i.
We also hypothesized that maternal perceptions of the child as being high in both activity and negative emotionality and low in cooperativeness--perceptions that together refer to general child difficultness (see Goldsmith et al.
Determination of limits of errors for any measuring system for a given combination aerial/probe/near zone may be difficult and time demanding task and mathematical complexity is the main reason of the difficultness.
More than meets the eye: Parental and infant contributors to maternal and paternal reports of early infant difficultness.