The ever-accelerating pace of technological change may be minting a series of mini-generation gaps, with each group of children uniquely influenced by the tech tools available in their formative stages of development, says psychologist Larry Rosen and the author of the coming “Rewired: Understanding the iGeneration and the Way They Learn.”

Now in their 20s, those in the Net Generation, according to Dr. Rosen, spend two hours a day talking on the phone and still use e-mail frequently. The iGeneration — conceivably their younger siblings — spends considerably more time texting than talking on the phone, pays less attention to television than the older group and tends to communicate more over instant-messenger networks.

Dr. Rosen said that the newest generations, unlike their older peers, will expect an instant response from everyone they communicate with, and won’t have the patience for anything less.