Broadbent (1958)
Participant hears different messages in each ear, repeats one (shadowing), cannot report content of unattended ear. Psicologia Cognitiva Sternberg Pdf 105
Shows early bottleneck in information processing — foundational for understanding attention limits. If you meant something else by “put together a feature” (e.g., a PDF feature like search, bookmark, or annotation), please clarify, and I’ll adjust the answer accordingly. repeats one (shadowing)