Question 81

Experimental

The study employs an experimental research method to investigate how mothers can pass stress on to their infants. This approach allows researchers to manipulate variables and observe the direct effects of maternal stress on infant responses.

A) Case study

A case study involves an in-depth examination of a single individual or group, often focusing on unique cases. While case studies can provide valuable insights, they lack the controlled conditions and manipulation of variables necessary for establishing causal relationships, which is essential in this research context.

B) Naturalistic observation

Naturalistic observation entails observing subjects in their natural environment without intervention. Although this method can provide rich qualitative data, it does not allow for the manipulation of variables or the determination of cause-and-effect relationships, which are crucial for understanding how stress is transmitted from mothers to infants.

C) Correlational

Correlational research examines the relationship between two or more variables without manipulating them. While it can identify associations between maternal stress and infant responses, it does not establish causation. Thus, it is not suitable for the study's aim of demonstrating how stress is passed from mothers to infants.

D) Experimental

The experimental method is characterized by the manipulation of one or more independent variables to observe their effect on dependent variables. In this study, researchers likely manipulate the levels of stress experienced by mothers to directly observe the impact on their infants, thus establishing a causal link.

E) Longitudinal

Longitudinal research involves repeated observations of the same subjects over an extended period. While this method can track changes over time, it does not inherently involve the manipulation of variables necessary to determine causal relationships, making it less relevant to this specific study's focus on immediate effects of maternal stress.

Conclusion

The experimental method is the most appropriate choice for this study because it allows researchers to establish a causal relationship between maternal stress and its effects on infants. Other methods such as case studies, naturalistic observation, correlational, and longitudinal studies fail to provide the controlled conditions necessary to demonstrate how stress is transmitted from mothers to their infants. Hence, option D is definitively the correct answer.