Neurotensin

Tiny peptide, how much
Of which you’re releasing
This moment will decide

Whether your brain encodes
This memory fondly
Or fearfully. The tilt

Is in favor of fear,
Evolutionary
Bias for survival,

But valence assignment
Includes the happier
Recollections as well.

Now they are studying
How this molecular
Switch actually functions,

But what we want to know
Is how the brain can code
Most experience as

Indifference. Moment
To moment, what are you
Emitting to forget?