for the most part .... 该怎么翻译？

For the most part psychologists have assumed that we spend most of our time eagaged in goal-directed
请问，这里的For the most part psychologists 是想说大多数心理学家吗？为什么要那么复杂，直接说most不好吗？
还是有另外一个意思？那么For the most art psycholosists后面应该有逗号吗？

全句是这样的：
For the most part psychologists have assumed that we spend most of our time eagaged in goal-directedthought and that , every so often , we have blips of irrelevant thoughts that pop up on the radar

是大多数的意思，按我的意思，most确实省时省力，但是for the most part显然是一种高级表达，更适合书面。

part [pɑ:t] n. 部分；角色；零件 vt. 分开；分离；分配 vi. 分手；断裂 adv. 部分地 adj. 部分的