Assessing stimulus preference using response force in a conjugate preparation: A replication and extension.

The current study examined 98 participants' preferences for five pictorial stimuli. The researchers used a verbal multiple-stimulus-without-replacement (VMSWO) preference assessment with each participant to identify high-preference and low-preference pictorial stimuli. Next, participants viewed each pictorial stimulus in a randomized order on a computer while using a hand dynamometer that measured the amount of force they exerted to increase or maintain the visual clarity of each image. The results indicate that over 75% of participants' force response ranks corresponded with participants' VMSWO high-preference stimuli, VMSWO low-preference stimuli, or both. The results of the current study provide further evidence for the use of conjugate schedules in the assessment of stimulus preference with potential for use as a reinforcer assessment. Implications along with directions for future research and limitations of the findings are discussed.