An Index, and a frequent Super-Trope.
In text, providing internal monologue is easy; the author simply writes down the character's thoughts.
In theater, movies, and television, giving internal monologue is trickier. These are the various methods of Externalizing Internal Monologue.
- Aside Comment (a character speaks directly to the audience)
- Captain's Log
- Converse with the Unconscious
- Flashback, when seen through the eyes of one character.
- Floating Advice Reminder
- Good Angel, Bad Angel
- Inner Monologue
- Inner Monologue Conversation
- The Man in the Mirror Talks Back
- Mirror Monologue
- Pictorial Speech Bubble
- Private Eye Monologue
- The Rashomon requires either this, or wildly different events.
- Rebus Bubble
- Surrogate Soliloquy
- Speaking in Panels
- Talking to the Dead
- Taunting the Unconscious
- Thinking Out Loud, in which a character seems to have chronic Did I Just Say That Out Loud? Syndrome.
- Whole Episode Flashback when seen and narrated through one set of eyes.