ainsley is participating in a study that aims to determine whether the occipital cortex becomes more active in response to moving versus stationary stimuli. when she arrives at the lab, she ingests a “tracer” and then enters the scanning machine. what type of brain imaging is most likely being conducted in this study?

The type of brain imaging most likely being conducted in Ainsley's study is Positron Emission Tomography (PET). This is because PET imaging involves the ingestion of a radioactive tracer, which allows researchers to measure and visualize brain activity by detecting changes in blood flow and metabolism in specific brain regions, such as the occipital cortex in response to moving versus stationary stimuli

. Other imaging methods like fMRI do not typically require ingestion of a tracer but instead use magnetic fields and radio waves to measure blood oxygenation levels. EEG, CT scans, and MRI do not involve ingesting a tracer, making PET the most plausible imaging technique given the description of the procedure.