Which labeled structure in the figure is a lacuna? 
Definitions:
Schoolwork Focus
The concentration and prioritization dedicated towards academic tasks and learning activities.
Nightmares Increase
Refers to the phenomenon where the frequency or intensity of nightmares grows, often due to stress, trauma, or certain sleep disorders.
School Performance
A measure of how well students achieve or perform academically in their educational setting.
Variable Ratio
A schedule of reinforcement where a response is rewarded after an unpredictable number of responses, enhancing motivation to respond.
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