Muscle-based memory for motor skills/actions. Unlike episodic and semantic memories that require conscious effort to retrieve, procedural memories can be recalled without conscious awareness or a great deal of effort. For example, an experienced driver will often change gears without consciously thinking about it. However, procedural memories are more difficult to verbally explain than episodic and semantic memories (e.g. explaining how to ride a bike). Procedural memories are also more resistant to forgetting than episodic and semantic memories.