PSYC 217 04b pilot studies and preventing demand

Multi Measure Approach

  • The multi measure approach uses different operational definitions for the same concept.

  • This is beneficial for young researchers as it allows for testing different operational definitions of hypotheses.

  • Example: Comparing interest in winning a DARTS competition versus winning a Boggle competition.

    • Some individuals may find the relationship similar, while others may react dramatically differently based on personal skills or preferences.

Operational Definitions and Hypothesis Testing

  • Researchers can modify the independent variable (IV) or dependent variable (DV) from published studies to explore the relationships between variables.

  • Example: Changing the operational definitions to see if a relationship exists with the new definitions.

Measurement Techniques and Psychological Constraints

  • Different measurement techniques can impose psychological constraints on participants.

  • Example: In person perception studies, the time allowed for judgment may alter the ratings assigned.

    • Immediate reactions may predict unconscious behaviors, while more considered responses often correlate with conscious behaviors.

Cognitive Constraints in Judgment Tasks

  • Studies may involve cognitive loads, such as memorizing numbers while rating faces.

    • This can impact participants' ability to make deliberate judgments.

    • Relates to real-life scenarios, such as remembering a shopping list or dealing with stress during decision-making.

Experimental Design: Pilot Studies

  • A pilot study is conducted before data collection to ensure smooth participant experiences.

  • It tests the experimental setup for any logistical issues or potential confounds.

    • Example: Running through the study with a confederate to ensure proper protocol.

    • Identifies issues such as unrealistic or confusing scripts before real data is collected.

Importance of Ceilings and Floors in Performance Tasks

  • An effective pilot study helps avoid ceiling effects (when everyone performs too well) or floor effects (when no one performs well).

    • Example of a failed dependent measure: A long division task that few could complete due to it being outdated or too difficult.

Manipulation Checks in Pilot Testing

  • Researchers should probe pilot study participants about their thoughts and feelings during the study.

    • Example: For stress studies, check if participants in high-stress conditions report higher stress levels compared to low-stress conditions.

    • These checks ensure that the manipulation affects participants as intended.

Separation of Pilot Studies from Hypothesis Testing

  • It’s crucial to distinguish between pilot testing and actual hypothesis testing.

    • Pilot testing ensures effective manipulation of the IV and appropriate measurement of the DV without bias from hypothesis testing.

    • Avoid publishing pilot study data as result findings unless the study confirms a hypothesis.

Ethics in Research Methodology

  • Researchers must consider ethics, especially regarding deception and manipulation in studies.

  • Ethical standards vary across fields; psychologists may allow mild deception, while other fields, like behavioral economics, may have stricter guidelines.

Demand Characteristics and Participant Expectation

  • Participants may guess the aim of an experiment based on their assigned conditions.

  • Example: Expectations about a study linking exercise and happiness may skew participants' reporting.

Techniques to Reduce Demand Characteristics

  • Use of single-blind and double-blind designs can mitigate biases:

    • Single-blind: Participants are unaware of their condition but researchers know.

    • Double-blind: Both participants and researchers are unaware of condition assignments.

    • Example: In a placebo vs. caffeine study, ensuring both parties don’t know who receives which treatment.

Using Placebos and Cover Stories

  • A cover story might distract participants from the true objective of the study, such as in the Milgram experiments where the deception was about learning rates and punishment.

Closing Notes for Research Planning

  • During group research sessions, facilitate collaboration to operationalize IV and DV clearly among all group members.

  • Ensure that before data collection, there is a solid understanding of the manipulations being tested.