title: A dorsal light reflex in a squid.
abstract: A dorsal light reflex is described in the squid Lolliguncula brevis. When illuminated from the side in visually homogeneous surroundings, a free-swimming squid rolls the dorsal side of its head and trunk 10-20 degrees towards the light. With the trunk restricted in a holder, the squid rolls its head 4-5 degrees towards the light; this reaction increases by about 50% when the statocysts are bilaterally removed and increases further when the neck receptor organ is also destroyed. The results indicate a multi-modal interaction of visual, statocyst and proprioceptive inputs during postural control.
authors.affiliation: Marine Biomedical Institute, University of Texas Medical Branch, Galveston 77555-1163, USA.
authors.forename: T
authors.initials: T
authors.lastname: Preuss
authors.forename: B U
authors.initials: BU
authors.lastname: Budelmann
mesh_terms: D000818:Animals; D049832:Decapodiformes / Q000502:physiology* / Q000528:radiation effects; D008027:Light; D008124:Locomotion / Q000502:physiology* / Q000528:radiation effects; D008465:Mechanoreceptors / Q000502:physiology; D011187:Posture / Q000502:physiology; D011434:Proprioception / Q000502:physiology; D012018:Reflex / Q000528:radiation effects*; D012399:Rotation; D012679:Sense Organs / Q000502:physiology