Concept:
Different psychotherapies focus on different methods of understanding and improving human behaviour and emotions.
Step 1:
Gestalt therapy emphasizes awareness, self-understanding, and integration of thoughts, feelings, and actions.
Step 2:
It attempts to help individuals experience themselves as a complete and unified whole.
Step 3:
• Logo therapy focuses on finding meaning in life.
• Electro-convulsive therapy is a medical treatment using electric stimulation.
• Rogerian therapy emphasizes unconditional positive regard and empathy.
Step 4:
Therefore, the correct answer is Gestalt therapy.
\[
\boxed{\text{(3) Gestalt therapy}}
\]