According to K. Warner Schaie's Seattle Longitudinal Study, which of the following is most likely to decline by middle adulthood?

Inductive reasoning generally remains stable or may even improve during middle adulthood as individuals accumulate knowledge and experience. This cognitive skill benefits from life experiences, allowing for better pattern recognition and problem-solving capabilities.

Spatial orientation tends to be relatively resilient during middle adulthood, with many individuals maintaining or improving their spatial skills through practice and real-life applications. Activities involving navigation and spatial tasks can enhance this cognitive domain.

Verbal memory often remains stable or shows mild improvement during middle adulthood due to the accumulation of knowledge and vocabulary over time. Many individuals continue to effectively use strategies to enhance their verbal memory as they age.

Vocabulary tends to increase or remain stable throughout adulthood, as individuals continue to learn new words and concepts. This cognitive ability is less likely to decline compared to processing speed, which is influenced by age-related changes in cognitive function.