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.
Cardiac vagal tone: stability and relation to difficultness
in infants and 3-year aids.
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