Inter experiment conditions

When designing experiments, especially in psychological and behavioral research, between-group designs are commonplace. These designs involve comparing two or more groups, with each group experiencing a different condition. Cognition has integrated tools to efficiently manage these inter-experiment conditions. Let's delve into how you can utilize this feature:

1. The Essence of Between-Group Study Design

In between-group (or between-groups) designs, different participants are assigned to different conditions, ensuring that each group experiences only one of the conditions.

2. Automatic Participant Assignment

Cognition streamlines the condition assignment process by:
  • Automatically allocating participants to different conditions.
  • If you specify multiple conditions, Cognition will ensure an even distribution of participants across these conditions. This balance ensures unbiased results and easier statistical analysis.

3. Accessing Assigned Condition in Runtime

Once a participant is assigned to a condition, this information is made available during the experiment runtime via the variable CONDITION.

4. Practical Application

Let's explore a practical code example to understand how CONDITION can be harnessed:
javascriptCopy codevar test_stimuli = [
{ stimulus: "img/blue.png", correct_response: CONDITION == 2 ? 'f' : 'j' },
{ stimulus: "img/orange.png", correct_response: CONDITION == 2 ? 'j' : 'f' }
In this scenario:
  • If a participant has been assigned to Condition 2, their correct responses will be 'f' for the blue image and 'j' for the orange image.
  • For participants in any other condition, the correct responses are reversed.

5. Testing Specific Conditions

While editing your task and using the live preview function:
  • Cognition provides an option titled "Set condition."
  • This tool allows you to simulate a specific condition, ensuring you can test the task as if you were a participant assigned to that condition.
In conclusion, the inter-experiment conditions feature in Cognition greatly simplifies the process of managing and implementing between-group study designs. Whether you're comparing two conditions or several, Cognition ensures a balanced and efficient distribution of participants, all while giving you the tools to easily craft and test condition-specific task elements.