inclusion criteria: * male or female; * a valid positive pcr test or a documented certified rapid antigen test or a virus-specific antibody (nucleocapsid) test for covid-19 issued at least 3 months prior to study; * above medium subjective working memory impairment (at least "much worse" in item 1a part 2 (cognitive abilities) of the covid-q screening questionnaire; * present at least 3 months after covid-19 infection and lasting for at least 2 months. (the impairment must have emerged after covid-19 infection and cannot be explained by an alternative diagnosis); * normotensive (bp: 90/60mmhg - 140/90mmhg); * bmi: 19.0 - 40.0 kg/m2; * age: 18 - 69 years; * fluent german-speaking; * ic as documented by signature.

inclusion criteria: * male or female; * a valid positive pcr test or a documented certified rapid antigen test or a virus-specific antibody (nucleocapsid) test for covid-19 issued at least 3 months prior to study; * above medium subjective working memory impairment (at least "much worse" in item 1a part 2 (cognitive abilities) of the covid-q screening questionnaire; * present at least 3 months after covid-19 infection and lasting for at least 2 months. (the impairment must have emerged after covid-19 infection and cannot be explained by an alternative diagnosis); * normotensive (bp: 90/60mmhg - 140/90mmhg); * bmi: 19.0 - 40.0 kg/m2; * age: 18 - 69 years; * fluent german-speaking; * ic as documented by signature.

inclusion criteria: male or female; a valid positive pcr test or a documented certified rapid antigen test or a virus-specific antibody (nucleocapsid) test for covid-19 issued at least 3 months prior to study; above medium subjective working memory impairment (at least "much worse" in item 1a part 2 (cognitive abilities) of the covid-q screening questionnaire; present at least 3 months after covid-19 infection and lasting for at least 2 months. (the impairment must have emerged after covid-19 infection and cannot be explained by an alternative diagnosis); normotensive (bp: 90/60mmhg - 140/90mmhg); bmi: 19.0 - 40.0 kg/m2; age: 18 - 69 years; fluent german-speaking; ic as documented by signature.

inclusion criteria: male or female; a valid positive pcr test or a documented certified rapid antigen test or a virus-specific antibody (nucleocapsid) test for covid-19 issued at least 3 months prior to study; above medium subjective working memory impairment (at least "much worse" in item 1a part 2 (cognitive abilities) of the covid-q screening questionnaire; present at least 3 months after covid-19 infection and lasting for at least 2 months. (the impairment must have emerged after covid-19 infection and cannot be explained by an alternative diagnosis); normotensive (bp: 90/60mmhg - 140/90mmhg); bmi: 19.0 - 40.0 kg/m2; age: 18 - 69 years; fluent german-speaking; ic as documented by signature.

inclusion criteria: male or female; a valid positive pcr test or a documented certified rapid antigen test or a virus-specific antibody (nucleocapsid) test for covid-19 issued at least 3 months prior to study; above medium subjective working memory impairment (at least "much worse" in item 1a part 2 (cognitive abilities) of the covid-q screening questionnaire; present at least 3 months after covid-19 infection and lasting for at least 2 months. (the impairment must have emerged after covid-19 infection and cannot be explained by an alternative diagnosis); normotensive (bp: 90/60mmhg - 140/90mmhg); bmi: 19.0 - 30.0 kg/m2; age: 18 - 69 years; fluent german-speaking; ic as documented by signature.

inclusion criteria: male or female; a valid positive pcr test or a documented certified rapid antigen test or a virus-specific antibody (nucleocapsid) test for covid-19 issued at least 3 months prior to study; above medium subjective working memory impairment (at least "much worse" in item 1a part 2 (cognitive abilities) of the covid-q screening questionnaire; present at least 3 months after covid-19 infection and lasting for at least 2 months. (the impairment must have emerged after covid-19 infection and cannot be explained by an alternative diagnosis); normotensive (bp: 90/60mmhg - 140/90mmhg); bmi: 19.0 - 30.0 kg/m2; age: 18 - 69 years; fluent german-speaking; ic as documented by signature.

inclusion criteria: male or female; a valid positive pcr test or a documented certified rapid antigen test or a virus-specific antibody (nucleocapsid) test for covid-19 issued at least 3 months prior to study above medium subjective working memory impairment (at least "much worse" in item 1a part 2 (cognitive abilities) of the covid-q screening questionnaire present at least 3 months after covid-19 infection and lasting for at least 2 months. (the impairment must have emerged after covid-19 infection and cannot be explained by an alternative diagnosis) normotensive (bp between 90/60mmhg and 140/90mmhg) bmi between 19 and 29,9 kg/m2 aged between 18 and 60 years fluent german-speaking ic as documented by signature

inclusion criteria: male or female; a valid positive pcr test or a documented certified rapid antigen test or a virus-specific antibody (nucleocapsid) test for covid-19 issued at least 3 months prior to study above medium subjective working memory impairment (at least "much worse" in item 1a part 2 (cognitive abilities) of the covid-q screening questionnaire present at least 3 months after covid-19 infection and lasting for at least 2 months. (the impairment must have emerged after covid-19 infection and cannot be explained by an alternative diagnosis) normotensive (bp between 90/60mmhg and 140/90mmhg) bmi between 19 and 29,9 kg/m2 aged between 18 and 60 years fluent german-speaking ic as documented by signature

inclusion criteria: male or female; a valid positive pcr test for covid-19 issued at least 3 months prior to study above medium subjective working memory impairment (at least "much worse" in item 1a part 2 (cognitive abilities) of the covid-q screening questionnaire present at least 3 months after covid-19 infection and lasting for at least 2 months. (the impairment must have emerged after covid-19 infection and cannot be explained by an alternative diagnosis) normotensive (bp between 90/60mmhg and 140/90mmhg) bmi between 19 and 29,9 kg/m2 aged between 18 and 60 years fluent german-speaking ic as documented by signature

inclusion criteria: male or female; a valid positive pcr test for covid-19 issued at least 3 months prior to study above medium subjective working memory impairment (at least "much worse" in item 1a part 2 (cognitive abilities) of the covid-q screening questionnaire present at least 3 months after covid-19 infection and lasting for at least 2 months. (the impairment must have emerged after covid-19 infection and cannot be explained by an alternative diagnosis) normotensive (bp between 90/60mmhg and 140/90mmhg) bmi between 19 and 29,9 kg/m2 aged between 18 and 60 years fluent german-speaking ic as documented by signature

inclusion criteria: male or female; a valid positive pcr-test for covid-19 issued at least 3 months prior to study; above medium subjective working memory impairment present at least 3 months after covid-19 infection and lasting for at least 2 months. (the impairment must have emerged after covid-19 infection and cannot be explained by an alternative diagnosis); normotensive (bp between 90/60mmhg and 140/90mmhg); bmi between 19 and 29,9 kg/m2; aged between 18 and 60 years; fluent german-speaking; ic as documented by signature.

inclusion criteria: male or female; a valid positive pcr-test for covid-19 issued at least 3 months prior to study; above medium subjective working memory impairment present at least 3 months after covid-19 infection and lasting for at least 2 months. (the impairment must have emerged after covid-19 infection and cannot be explained by an alternative diagnosis); normotensive (bp between 90/60mmhg and 140/90mmhg); bmi between 19 and 29,9 kg/m2; aged between 18 and 60 years; fluent german-speaking; ic as documented by signature.