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Area of Science:

  • Cognitive Neuroscience
  • Human Aging Research
  • Psychology

Background:

  • Age-associated cognitive slowing is well-documented, particularly in mental rotation (MR).
  • Previous research identified slower response times in older adults but didn't specify the affected subprocess.
  • The intercept of MR response time functions, reflecting early encoding and late response selection, is larger in older adults.

Purpose of the Study:

  • To investigate which subprocesses of mental rotation (MR) are affected by aging.
  • To differentiate age-related effects on stimulus encoding versus response selection/execution in MR tasks.
  • To utilize electrophysiological measures to pinpoint the timing of age-related cognitive delays in MR.

Main Methods:

  • Recorded event-related potentials (ERPs) in younger and older adults performing a letter rotation task.
  • Analyzed the onset of rotation-related negativity (RRN), an electrophysiological marker of MR.
  • Examined the modulation of RRN amplitude by rotation angle across different time windows.

Main Results:

  • The onset of the RRN was significantly delayed in older adults compared to younger adults.
  • In younger adults, RRN amplitude was modulated by rotation angle earlier (350–500 ms).
  • In older adults, RRN amplitude modulation by rotation angle occurred later (500–650 ms).

Conclusions:

  • Mental rotation (MR) processing is initiated later in older adults.
  • The initial phase of processing, preceding MR proper, contributes significantly to age-related slowing in MR tasks.
  • Potential causes include prolonged stimulus encoding or difficulties in attentional shifting from external stimuli to internal representations.