A grin stretched across Leoโ€™s face as he read the letter. A half-sister. Impossible! He ran a hand through his hair, the edges of his smile widening. He bounced on the balls of his feet. This was going to be an adventure.

He grabbed his phone, already envisioning a call to his best friend, Liam. He wanted to blurt it all out. He struggled to contain his overflowing energy, and ended up pacing back and forth in his small apartment. The thought of it filled him with a bubbly sensation, like the feeling of anticipation before a roller coaster.

He pictured their first meeting, envisioning the confusion on her face. Maybe they could go skydiving. Or perhaps they could start a band. He let out a whoop of delight and immediately pulled out his laptop to start searching for information. Time to investigate.

Emotion: playful

Cluster: Positive / Joy
PC1 (Valence): 4.42 Positive
PC2 (Disposition): 1.44

Role in Research

This story is one of 1,000 stories generated for the emotion playful. During extraction, it was fed through Gemma4-31B and its hidden state activations were captured at 11 layers.

The mean activation across all 1,000 playful stories, after denoising with neutral dialogue baselines, produces the playful emotion vector -- a direction in the model's 5,376-dimensional representation space.

Logit Lens (Layer 40)

Tokens promoted/suppressed when the playful vector is projected through the unembedding matrix.

Promoted:
B0.662
(!)0.566
!0.562
!?0.553
๐Ÿ˜œ0.553
Suppressed:
ness-0.685
๐Ÿ˜ž-0.590
S-0.562
๐Ÿ˜”-0.470
ะธะดั‚ะธ-0.461