Research Article

Prevalence and Risk Factors for Minor Hallucinations in Patients with Parkinson’s Disease

Table 1

Characteristics and contents of minor hallucination.

Presence hallucinationPassage hallucinationVisual illusion
Object misidentificationPareidoliaKineptosiaSum

Number28 (23.0%)35 (28.7%)24 (19.7%)17 (13.9%)18 (14.8%)59 (48.4%)
Appearance time
 Daytime15 (53.6%)24 (68.6%)11 (45.8%)11 (64.7%)8 (44.4%)30 (50.8%)
 Nighttime7 (25.0%)4 (11.4%)8 (33.3%)2 (11.8%)8 (44.4%)18 (30.5%)
 Both6 (21.4%)7 (20.0%)5 (20.8%)4 (23.5%)2 (11.1%)11 (18.6%)
Lighting
 Bright7 (25.0%)12 (34.3%)6 (25.0%)8 (47.1%)7 (38.9%)21 (35.6%)
 Dim18 (64.3%)18 (51.4%)17 (70.8%)8 (47.1%)9 (50.0%)34 (57.6%)
 Dark2 (7.1%)4 (11.4%)0 (0.0%)1 (5.9%)2 (11.1%)3 (5.1%)
 Variable1 (3.6%)1 (2.9%)1 (4.2%)0 (0.0%)0 (0.0%)1 (1.7%)
Environment
 Indoor24 (85.7%)24 (68.6%)18 (75.0%)16 (94.1%)16 (88.9%)50 (84.7%)
 Outdoor1 (3.6%)9 (25.7%)4 (16.7%)1 (5.9%)0 (0.0%)5 (8.5%)
 Variable3 (10.7%)2 (5.7%)2 (8.3%)0 (0.0%)2 (11.1%)4 (6.8%)
Onset
 Sudden23 (82.1%)33 (94.3%)24 (100.0%)14 (82.4%)18 (100.0%)56 (94.9%)
 Gradual5 (17.9%)2 (5.7%)0 (0.0%)3 (17.6%)0 (0.0%)3 (5.1%)
Lasting time
 Seconds23 (82.1%)35 (100.0%)17 (70.8%)13 (76.5%)15 (83.3%)45 (76.3%)
 Minutes5 (17.9%)0 (0.0%)7 (29.2%)4 (23.5%)3 (16.7%)14 (23.7%)
Frequency
 Daily5 (17.9%)4 (11.4%)10 (41.7%)6 (35.3%)4 (22.2%)20 (33.9%)
 1–6 times/week20 (71.4%)19 (54.3%)8 (33.3%)6 (35.3%)9 (50.0%)23 (39.0%)
 <1/week3 (10.7%)12 (34.3%)6 (25.0%)5 (29.4%)5 (27.8%)16 (27.1%)
Duration
 <1 month0 (0.0%)0 (0.0%)0 (0.0%)1 (5.9%)0 (0.0%)1 (1.7%)
 1 month-1 year15 (53.6%)19 (54.3%)11 (45.8%)9 (52.9%)11 (61.1%)31 (52.5%)
 >1 year13 (46.4%)16 (45.7%)13 (54.2%)7 (41.2%)7 (38.9%)27 (45.8%)
Premotor
 Yes3 (10.7%)10 (28.6%)7 (29.2%)3 (17.6%)4 (22.2%)14 (23.7%)
 No25 (89.3%)25 (71.4%)17 (70.8%)14 (82.4%)14 (77.8%)45 (76.3%)
Clarity
 Sharp1 (3.6%)4 (11.4%)3 (12.5%)3 (17.6%)4 (22.2%)10 (16.9%)
 Blurry26 (92.9%)31 (88.6%)21 (87.5%)13 (76.5%)14 (77.8%)48 (81.4%)
 Variable1 (3.6%)0 (0.0%)0 (0.0%)1 (5.9%)0 (0.0%)1 (1.7%)
Size
 Normal26 (92.9%)31 (88.6%)23 (95.8%)16 (94.1%)18 (100.0%)57 (96.6%)
 Miniaturized2 (7.1%)3 (8.6%)0 (0.0%)1 (5.9%)0 (0.0%)1 (1.7%)
 Magnified0 (0.0%)0 (0.0%)1 (4.2%)0 (0.0%)0 (0.0%)1 (1.7%)
 Variable0 (0.0%)1 (2.9%)0 (0.0%)0 (0.0%)0 (0.0%)0 (0.0%)
Stereotyped
 Yes12 (42.9%)23 (65.7%)14 (58.3%)10 (58.8%)11 (61.1%)35 (59.3%)
 No13 (46.4%)10 (28.6%)9 (37.5%)7 (41.2%)6 (33.3%)22 (37.3%)
 Cannot describe3 (10.7%)2 (5.7%)1 (4.2%)0 (0.0%)1 (5.6%)2 (3.4%)
Color
 Black and white24 (85.7%)30 (85.7%)15 (62.5%)11 (64.7%)6 (33.3%)32 (54.2%)
 Multiple colors4 (14.3%)5 (14.3%)9 (37.5%)6 (35.3%)12 (66.7%)27 (45.8%)
Content
 Familiar lived people4 (14.3%)1 (2.9%)0 (0.0%)0 (0.0%)0 (0.0%)0 (0.0%)
 Unfamiliar people22 (78.6%)18 (51.4%)12 (50.0%)11 (64.7%)0 (0.0%)23 (39.0%)
 Deceased relatives0 (0.0%)1 (2.9%)0 (0.0%)0 (0.0%)0 (0.0%)0 (0.0%)
 Animals0 (0.0%)6 (17.1%)3 (12.5%)5 (29.4%)2 (11.1%)10 (16.9%)
 Objects1 (3.6%)3 (8.6%)8 (33.3%)1 (5.9%)16 (88.9%)25 (42.4%)
 Cannot describe1 (3.6%)6 (17.1%)1 (4.2%)0 (0.0%)0 (0.0%)1 (1.7%)