Knowledge domain and emerging trends in visual hallucination research: A scientometric analysis

Table 1 Major clusters of co-cited references

Cluster	Size	Silhouette	Mean (year)	Label (LLR)
0	154	0.727	2011	Body disease
1	110	0.883	1997	Senile dementia
2	82	0.715	2001	Hallucinosis
3	71	0.77	2005	Incident dementia
4	70	0.903	2014	Parkinson's disease dementia
5	57	0.957	2001	Charles bonnet syndrome
6	52	0.968	2014	Schizophrenia
7	47	0.822	2008	Impulse control disorder
9	11	0.975	2006	Rem sleep behavior disorder
10	11	0.99	2010	5 HT2a receptor

Ten major clusters were selected from the total 69 clusters. Each cluster represents a research subfield. The size is the number of cited articles in one cluster. The Silhouettre value indicates the homogeneity or consistency of the cluster. Mean year stands for the mean publication year of the cited articles. The label of cluster is based on log-likelihood ratio.

Table 2 Top three references ranked by four values respectively

Values		Ref.	Journal, volume, start page	Cluster #
Counts	124	Mckeith et al[69], 2005	Neurology, 65, 1863	3
	93	Harding et al[70], 2002	Brain, 125, 391	3
	91	Mckeith et al[36], 1996	Neurology, 47, 1113	1
Centrality	0.09	Aarsland et al[71], 2002	J Neurol Neurosur Ps, 72, 708	1
	0.08	Goetz et al[72], 2011	Movement Disord, 26, 2196	0
	0.07	Cummings et al[46], 2014	Lancet, 383, 533	0
Bursts	44.12	Mckeith et al[74], 2017	Neurology, 89, 88	4
	43.96	Mckeith et al[36], 1996	Neurology, 47, 1113	1
	43.86	Mckeith et al[69], 2005	Neurology, 65, 1863	3
Sigma	4.49	Teunisse et al[79], 1996,	Lancet, 347, 794	5
	4.36	Cummings et al[46], 2014	Lancet, 383, 533	0
	4.04	Mckeith et al[69], 2005	Neurology, 65, 1863	3