The style of parenting known to the Silents and the generations before them originated in the late 1800s. Representative of this was the idea that "children should be seen but not heard." These ideas were ultimately challenged following the 1946 publication of the book "The Common Sense Book of Baby and Child Care" by Benjamin Spock which influenced some Boomers' views on parenting and family values when they became parents themselves. These conflicting views, seen as overly permissive by the Silents, further estranged those Boomers from their parents and, amongst other things, gave rise in the mid 1960s to the term generation gap to describe initially the conflict of cultural values between the Silents and their Boomer (and later Gen X) children.