Researchers questioned volunteers aged 18 to 94 every week for five years about their feelings.

Some researchers question these measurements' reliability, noting they were much larger than any other accurately reported sighting.

Researchers question if the participants recalling celebrity names were basing frequency estimates on the amount of content recalled or on the ease of recall.

Researchers question whether these tools can work together and/or combine with other tools to allow for positive participation.

Many researchers question the first-line prescribing of atypicals over typicals, and some even question the distinction between the two classes.