Table 2.

Summary of main results of papers employing goal-directed paradigms with naturalistic stimuli. All comparisons are between people with PD and HC. PD, Parkinson’s disease; ROI, region of interest; HC, healthy control; CN, cognitively normal

Study	Groups (n)	Task	Main results
Beylergil et al.39	PD on medication (13) Age-matched HC (7)	Complex visual search	PD patients were slower to look at ROI in the unexpected condition. Higher fixational saccade frequencies in PD. Lower non-fixational saccade frequencies in PD.
Bek et al.40	PD (21) Age-matched HC (23) Medication state unreported	Observation and imitation	No significant differences.
Bek et al.41	PD, on medication (18) Age-matched HC (21)	Observation and imitation	Unlike HC, PD patients did not modulate eye movements based on predictability.
Nagai et al.42	PD, on medication (13) Age-matched HC (17) Young HC (36)	Clock matching Inverted clock matching	PD exhibited more saccades to ROI and array ROIs and larger deficiency score on inverted clock-matching.
Archibald et al.43	PD-CN, on medication (35) HC (29)	Clock matching Inverted clock matching Angle matching Shape position Overlapping figures Data from all tasks analyzed together.	PD-CN made longer fixations during viewing.
Aveni et al.44	PD (24), on medication (23) Age-matched HC (24)	Sentence-picture matching	No significant differences.