Q61

Many invocations list verbal and somatic components. However, they are SLAs, so I would assume that unless listed, they would be purely mental actions, right? For example, the Warlock's Eldritch Blast and the Dragonfire Adept's Magic Insight (Dragon Magic, 81) both, so far as I can tell, fail to list any spellcasting components.Would they then be purely mental actions?