Enhancing encoding through repeated study affects retrieval related pupil dilation during cued recall, but not during...

Area of Science:

• Cognitive Neuroscience
• Neurobiology

Background:

• Pupil dilation is linked to mental effort and offers insights into episodic memory.
• Encoding conditions influence pupil responses during memory retrieval.

Purpose of the Study:

• To investigate how memory trace strength, manipulated by encoding repetition, affects pupil responses during recognition and cued recall tasks.
• To determine if pupillometry can reliably assess memory trace strength across different retrieval paradigms.

Main Methods:

• Participants encoded word pairs once or twice.
• Pupil responses were measured during subsequent recognition and cued recall tasks.

Main Results:

• Repeated encoding enhanced memory accuracy and speed.
• Reduced pupil dilation correlated with stronger memory traces only in cued recall.
• Pupil dilation in recognition tasks reflected familiarity rather than memory strength.

Conclusions:

• The effectiveness of pupillometry in assessing memory trace strength is dependent on the retrieval task used.
• Pupil responses may differentiate between recollection and familiarity in recognition, independent of memory strength.