Abstract：
BACKGROUND:Major depressive disorder may be a heterogeneous disorder, yet melancholic depression is the most consistently described subtype, regarded as qualitatively different to non-melancholic depression in terms of cognitive and motor impairments. Eye movement studies in depression are infrequent and findings are inconclusive. METHODS:This study employed a battery of saccadic eye movement tasks to explore reflexive saccades, as well as higher order cognitive aspects of saccades including inhibitory control and spatial working memory. Nineteen patients with major depressive disorder (9 melancholic; 10 non-melancholic) and 15 healthy controls participated. RESULTS:Differences were revealed between melancholic and non-melancholic patients. Melancholia was associated with longer latencies, difficulty increasing peak velocities as target amplitudes increased, and hypometric primary saccades during the predictable protocol. In contrast, the non-melancholic depression group performed similarly to controls on most tasks, but saccadic peak velocity was increased for reflexive saccades at larger amplitudes. LIMITATIONS:Most patients were taking antidepressant medication. CONCLUSIONS:The latency increases, reduced peak velocity and primary saccade hypometria with more severe melancholia may be explained by functional changes in the fronto-striatal-collicular networks, related to dopamine dysfunction. In contrast, the serotonergic system plays a greater role in non-melancholic symptoms and this may underpin the observed increases in saccadic peak velocity. These findings provide neurophysiological support for functional differences between depression subgroups that are consistent with previous motor and cognitive findings.
journal_name
J Affect Disordjournal_title
Journal of affective disordersauthors
Winograd-Gurvich C,Georgiou-Karistianis N,Fitzgerald PB,Millist L,White OBdoi
10.1016/j.jad.2006.03.018subject
Has Abstractpub_date
2006-07-01 00:00:00pages
193-203issue
1-3eissn
0165-0327issn
1573-2517pii
S0165-0327(06)00143-1journal_volume
93pub_type
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