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Oculomotor pursuit can be elicited by moving visual, tactile, proprioceptive, and occasionally auditory targets presented singly. Both the accuracy and amount of pursuit are enhanced if the position of the target is specified by cues from several sensory modalities. When the motion of the target is topologically related to movements of the subject's arm,(More)
1. This study begins to evaluate how octopuses navigate, and whether they can use visual landmarks. Paths ofOctopus vulgaris were observed in the field as they foraged and responded to displacements.Octopus rubescens were trained to orient to a beacon in the laboratory, and response to its displacement was monitored. 2. Octopuses foraged using chemotactile(More)
Behavioural evidence suggests that cephalopod molluscs may have a form of primary consciousness. First, the linkage of brain to behaviour seen in lateralization, sleep and through a developmental context is similar to that of mammals and birds. Second, cephalopods, especially octopuses, are heavily dependent on learning in response to both visual and(More)
During their 3rd week of life, 73 Octopus bimaculoides were observed to test whether discrete behaviors could be grouped reliably to reflect dimensions of temperament. Frequencies of behaviors during Week 3 were subjected to principal-components analysis (PCA), resulting in 4 components (active engagement, arousal/readiness, aggression, and(More)
An in-depth analysis of eye movements of schizophrenics has demonstrated defects in several oculomotor subsystems, likely due to processing of sensory information and not to problems in the motor system itself. Schizophrenic subjects made more pursuit tracking errors, due to higher RMS errors, larger phase lag, and more saccades in pursuit. When making(More)
Continuous ocular and manual tracking of the same visual target moving horizontally in sinusoids at 0.75 Hz was measured by lag, RMS Error, and Gain. The best measures of accuracy of tracking, error and lag, were remarkably similar in the two systems and were affected similarly by presence of a background and changes in predictability of target movement.(More)
Teenage children each having one schizophrenic parent showed deficits in oculomotor control which are also found in schizophrenic subjects compared with controls. They made significantly more saccadic eye movements interrupting smooth pursuit ocular tracking. They also made significantly more double-jump saccadic movements in a looking task. Since this(More)
Schizophrenic subjects have defects in oculomotor control which appear to be the result of inefficient processing of sensory information, not a problem in controlling the movement itself [Mather and Putchat (1983b) J. Psychiat Res. 17, 343-360]. A demonstration that manipulating sensory information by removing context information alters these same saccadic(More)
Rationale The original call for participation announced the following outline: <<The seven known species of the pygmy squid genus among the smallest living cephalopods. Recent studies revealed that at least some of these miniature squids are extremely short-lived, while they are " maximalists " in terms of their reproductive output. The small adult size and(More)