Inclusion Criteria:  the patient can consent for themselves; age 18+ years old; at least 7 days since diagnosis "stroke". Patients should demonstrate a clear deficit in either simple or complex visual perception in portions of their visual field  Exclusion Criteria:  Diminished capacity to consent; Pregnancy Known or suspected non-compliance, drug or alcohol abuse Inability to follow the procedures of the study, e.g., due to language problems, psychological disorders, dementia, etc. of the participant, Non-compliance to the instructions of the experimenter or an inappropriate behavior hindering the normal progress of the experiment. Previous enrolment into the current study Exclusion criteria of MRI, tACS, TMS Use of psychoactive medication