Our professor, Dr. Urquhart said that the brain, the biggest brain is, by practical psychology it has been tested, sixty-four ounce. And that is the highest brain substance. But for woman it is never more than thirty-six ounce. So they have tested all these practical psychologies.
So here the same word is used, that alpa-medhasa. It is very technical. Alpa means "very little" brain substance. Those who have got very little brain substance, they try like this. Kāṅkṣantaḥ karmaṇāṁ siddhiṁ yajanta iha devatāḥ. "Why little brain substance? He's getting profit from the demigods." Then brain substance little means he does not know what is his actual aim of life. He does not know. Na te viduḥ svārtha-gatiṁ hi viṣṇum (SB 7.5.31). Those who are trying to be happy within this material world, worshiping different types of demigods and taking benefit very soon, but he, because his brain substance is very little, he does not consider it that "How long I shall enjoy it? How long I shall enjoy?"