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Saccadic Intrusions in Schizophrenia: Identity With Square-Wave Jerks?-Reply

Smadar Levin, PhD; Philip S. Holzman, PhD; Lawrence Stark, MD; Ashby Jones, OD; Edward L. Merrin, MD
Arch Gen Psychiatry. 1983;40(12):1343. doi:10.1001/archpsyc.1983.01790110085015.
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In Reply.—  We are aware of the descriptions of SWJs that have appeared in the literature. For a number of reasons, however, we prefer the term saccadic intrusions to the term SWJs. The squareness of the SWJs depends on the amplification and speed of the chart recorder and, therefore, squareness is essentially an artifact of instrumentation. Furthermore, if these saccadic components of tracking are studied in sufficient detail, one can see that their trajectory over time is actually curved. Moreover, we are confident that all neuro-ophthalmologists understand that a saccade is not necessarily congruent with a square wave.Saccadic intrusions in pursuit movements and in suppression of occasional fixation saccades in strabismus have been described in studies1,2 cited as references in our article. In addition, one of us (L.S.) was a member of the group that first described and explained macrosaccadic oscillations in cerebellar disease,3 also cited in our


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