I was having a conversation with a graduating senior recently, and I asked them what they were going to do next year. Their response was simple: "I'm not going to graduate school, because I didn't apply. But I want to get a research job. So, I'm going to apply for lab manager positions or other research jobs, and then I was planning on applying for graduate school in the Fall."
Not really sure this is a good idea. Not really sure that graduating, getting a job in June, and then applying to graduate school in October is a good idea. In fact, it's a bad idea.
Why:
1) If you are interested in applying to graduate school, the main reason to not apply directly from your undergraduate experience is to get work experience. How much experience are you going to get in a few months? It usually takes that long just to find where the good coffee is. Committing to two years (i.e., applying the following Fall) will allow you to learn something from the job.
2) Practically, you are going to want a letter of recommendation from the PI or institution you are currently working for. If you don't get one from your current employer, it's a big red flag. So, what's going to happen. You are on the job for a few months and you ask for a letter for graduate school applications. Some PI's will just say no. So, big red flag. Others will say yes, but I guarantee that they will say two things in their letter. First they will say how long you have worked for them (which is not long), and second, they will more likely than not say that they don't know you that well (because you haven't worked for them for that long). Again, BIG RED FLAG.
3) The time between undergraduate and graduate school might allow you to publish work - either your thesis project or work that you do while at your new job. This will make you highly competitive not only for graduate programs, but for fellowships, which you could apply for while also doing your graduate admission. This is particularly important if you are thinking about graduate school in experimental psychology or cognitive science/cognitive neuroscience.
So, you want to go to graduate school, but not right away. My advice is commit to two years. At least.