Why does the structure of gramicidin, shown below, only allow topical use as an antibiotic? 
Definitions:
Broadbent's Model
A theory of attention that proposes that information is filtered at an early stage of perception, allowing only a subset of stimuli to be processed in detail.
Cocktail Party Effect
The ability of individuals to focus on a single conversation in a noisy environment, ignoring other conversations.
Dichotic Listening Phenomenon
a cognitive experiment where two different auditory stimuli are presented to each ear simultaneously, used to study selective attention and the brain’s processing of information.
Dichotic Listening Task
A psychological test used to investigate selective attention and the processing of different information presented to each ear simultaneously.
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