Final answer:
According to Herman Ebbinghaus's forgetting curve research, unfamiliar information is most likely forgotten within the first hour, with significant memory loss occurring quickly after learning and then leveling off.
Step-by-step explanation:
Based on Herman Ebbinghaus's forgetting curve research using nonsense syllables, unfamiliar information is forgotten within the first hour (B), according to the summary of his findings. Ebbinghaus discovered that an average person loses about 50% of memorized information after 20 minutes and approximately 70% after 24 hours, which demonstrates the concept of storage decay where memory for new information decays rapidly within the initial period and then levels out over time.
The Ebbinghaus's forgetting curve is an illustration of the decline in memory retention over time, highlighting how quickly new information can be lost if not frequently reviewed or reinforced. This curve is significant in the study of psychology as it provides insight into the temporal patterns of forgetting and the importance of repetition in learning.