A Study to Assess Multiple Ascending Dose, Drug-Drug Interaction, and Asian Pharmacokinetic Study of ABBV-1088

Inclusion Criteria: * Body Mass Index (BMI) is \> = 18.0 to \< = 32.0 kg/m\^2 after rounded to the tenths decimal, at Screening and upon confinement. * A condition of general good health, based upon the results of a medical history, physical examination, vital signs, laboratory profile and a 12-lead ECG. * Part 3 Only: Han Chinese Participant must be first-or second-generation Han Chinese of full Chinese parentage. First-generation participants will have been born in China to two participants and four grandparents also born in China of full Chinese descent. Second-generation participants born outside of China must have two parents and four grandparents born in China of full Chinese descent. Participants must maintain a typical Chinese lifestyle, including consuming a typical Chinese diet. OR * Japanese Participant must be first-or second-generation Japanese of full Japanese parentage. First-generation participants will have been born in Japan to two parents and four grandparents also born in Japan of full Japanese descent. Second-generation participants born outside of Japan must have two parents and four grandparents born in Japan of full Japanese descent. All participants must maintain a typical Japanese lifestyle, including consuming a typical Japanese diet. Exclusion Criteria: * Part 1 (Groups 1-4), Part 2 and Part 3: History of any clinically significant neurological, respiratory (except mild asthma as a child), endocrine, metabolic, renal, hepatic, gastrointestinal, hematologic or psychiatric disease or disorder, or any uncontrolled medical illness. * History of suicidal ideation within one year prior to study drug administration as evidenced by answering "yes" to questions 4 or 5 on the suicidal ideation portion of the Columbia Suicide Severity Rating Scale (C-SSRS) completed at Screening, or any history of suicide attempts within the last two years.