Final answer:
The subject of this question is Memory recall, specifically visual perception in the context of biology. It involves the brain's occipital lobe and the ability to interpret visual information.
Step-by-step explanation:
The subject of this question is Memory recall and it falls under the category of Biology. When you flash the word 'ball' in the left visual field only, it involves the process of visual perception, which is the ability to interpret and make sense of visual information. This process occurs in the brain's occipital lobe, where visual processing takes place.