Explanation:

- Option 1: Concieve is spelled incorrectly. The correct spelling is "Conceive." The rule "I before E except after C" applies here and helps in remembering the right sequence of letters.

- Option 2: Detect is spelled correctly. It means to discover or identify the presence of something, often through careful examination or observation.

- Option 3: Predict is spelled correctly. This word is used to indicate the act of saying what will happen in the future, often based on evidence or experience.

- Option 4: Stimulate is also spelled correctly. It refers to raising levels of physiological or nervous activity in the body or any biological system.

- The incorrectly spelled word is Concieve (Conceive).