The monolingual category describes those who are fluent in one language and have minimal knowledge in another language e.g. the person who remembers how to conjugate a few verbs or even a tense or two or have a very basic conversation in Spanish is considered monolingual in my study

Bilinguals are those who are fluent in 2 languages. They are comfortable expressing and understanding most ideas in 2 languages

I disqualify those who I consider grey-area participants. Those who have an intermediate knowledge of another language e.g. someone who can have conversations in a second language about many topics but would struggle to express more complex ideas. In terms of Spanish, I would say a person with intermediate knowledge could conjugate most tenses but would struggle in the more difficult aspects of speaking such as the subjunctive forms or idioms

I have already fulfilled my bilingual condition. That is why the title stresses monolingual. The advertisement in the post section was approved by my ethics board and thus I am not allowed change it