Circadian rhythm in olfactory response in the antennae controlled by the optic lobe in the cockroach

Page, Terry L.; Koelling, Erin E.

doi:10.1016/s0022-1910(03)00071-4

Cited by 74 publications

(55 citation statements)

References 34 publications

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“…In those species, the sensitivity of all ORCs is modulated simultaneously, making the insects more or less sensitive to all odours at the same time (Krishnan et al 1999, Page andKoelling 2003). This is not the case of modulation of olfactory sensitivity in triatomines.…”

Section: Olfaction In Vector-host Interactions 319 14 the Role Of Olmentioning

confidence: 99%

Olfaction in vector-host interactions

Takken¹,

Knols²

2010

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Section: Olfaction In Vector-host Interactions 319 14 the Role Of Olmentioning

confidence: 99%

Olfaction in vector-host interactions

Takken¹,

Knols²

2010

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“…Cockroaches exhibit a circadian rhythm in the sensitivity of the olfactory receptors in the antennae with an Ϸ5-fold higher sensitivity in the early subjective day than in the early subjective night (28). Thus, to control for the possibility that the increase in olfactory sensitivity at CT 2 results in a strong aversion to peppermint, which prevents conditioning, we repeated the experiments at CT 2 by using a 5-fold lower concentration (4 l) of peppermint for both training and testing.…”

Section: Is the Circadian Rhythm In Learning And Memory Related To Thmentioning

confidence: 99%

“…Two known circadian rhythms in cockroaches could indirectly affect memory acquisition or performance in olfactory learning and memory tasks: (i) the circadian rhythm in the activity/rest cycle (31), and (ii) a circadian rhythm in the sensitivity of olfactory receptors in the antennae (28,29). Curiously, the peak of olfactory sensitivity is in the subjective morning when the animals are least active and are deficient in olfactory learning.…”

Section: Memory Acquisition Vs Memory Retrievalmentioning

confidence: 99%

“…In cockroaches, one well known circadian clock that regulates spontaneous locomotor activity has been localized to the optic lobes (24,32). Evidence suggests that the optic lobe clock also is involved in the regulation of visual sensitivity of the compound eye (33) and olfactory sensitivity in the antennae (28). Thus, the optic lobe is a prime candidate for the site of the circadian oscillator that regulates olfactory learning.…”

Section: Memory Acquisition Vs Memory Retrievalmentioning

confidence: 99%

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Circadian regulation of insect olfactory learning

Decker

McConnaughey

Page

2007

Proc. Natl. Acad. Sci. U.S.A.

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Olfactory learning in insects has been used extensively for studies on the neurobiology, genetics, and molecular biology of learning and memory. We show here that the ability of the cockroach Leucophaea maderae to acquire olfactory memories is regulated by the circadian system. We investigated the effect of training and testing at different circadian phases on performance in an odordiscrimination test administered 30 min after training (short-term memory) or 48 h after training (long-term memory). When odor preference was tested by allowing animals to choose between two odors (peppermint and vanilla), untrained cockroaches showed a clear preference for vanilla at all circadian phases, indicating that there was no circadian modulation of initial odor preference or ability to discriminate between odors. After differential conditioning, in which peppermint odor was associated with a positive unconditioned stimulus of sucrose solution and vanilla odor was associated with a negative unconditioned stimulus of saline solution, cockroaches conditioned in the early subjective night showed a strong preference for peppermint and retained the memory for at least 2 days. Animals trained and tested at other circadian phases showed significant deficits in performance for both short-and long-term memory. Performance depended on the circadian time (CT) of training, not the CT of testing, and results indicate that memory acquisition rather than retention or recall is modulated by the circadian system. The data suggest that the circadian system can have profound effects on olfactory learning in insects.biological rhythms ͉ cockroach ͉ differential conditioning ͉ memory I n view of the widespread effects of circadian regulation on behavior and physiology, the possibility that learning and memory processes may be subject to modulation by the circadian system has long been recognized (1). Studies on this problem have suggested that the influence of the circadian system may take several forms. In some instances, the circadian phase may function as a context for learning (time stamping) so that recall and performance are better at 24-h intervals after learning (1-4). In other cases, performance may be modulated by the circadian phase independent of the phase of learning (5), and there have been several recent reports that memory acquisition or consolidation may depend on the circadian phase of training in mollusks (6-8), rodents (9, 10), and humans (11). Finally, there have been reports that disruption of the circadian system by phase shifting (jet lag) can impair memory (12, 13). Although these studies suggest that the circadian system may have widespread effects on various aspects of learning and memory, including acquisition, retention, and recall, there is virtually no information on the mechanisms by which the circadian system regulates these processes.Olfactory learning is an excellent model for exploration of the neural basis of learning and memory because of the remarkable similarity in the organization of olfactory systems acr...

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“…Cockroaches also show similar rhythmicity except for stridulatory rhythm. In addition to these, the antennal sensitivity rhythm to odor stimuli was recently shown to be driven by the optic lobe clock (Page and Koelling, 2003). The cuticular formation rhythm is the only exception so far.…”

Section: Central Vs Peripheral Clocksmentioning

confidence: 99%

Circadian Organization in Hemimetabolous Insects

Tomioka

Abdelsalam

2004

Zoological Science

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ABSTRACT-The circadian system of hemimetabolous insects is reviewed in respect to the locus of the circadian clock and multioscillatory organization. Because of relatively easy access to the nervous system, the neuronal organization of the clock system in hemimetabolous insects has been studied, yielding identification of the compound eye as the major photoreceptor for entrainment and the optic lobe for the circadian clock locus. The clock site within the optic lobe is inconsistent among reported species; in cockroaches the lobula was previously thought to be a most likely clock locus but accessory medulla is recently stressed to be a clock center, while more distal part of the optic lobe including the lamina and the outer medulla area for the cricket. Identification of the clock cells needs further critical studies. Although each optic lobe clock seems functionally identical, in respect to photic entrainment and generation of the rhythm, the bilaterally paired clocks form a functional unit. They interact to produce a stable time structure within individual insects by exchanging photic and temporal information through neural pathways, in which serotonin and pigment-dispersing factor (PDF) are involved as chemical messengers. The mutual interaction also plays an important role in seasonal adaptation of the rhythm.

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Circadian rhythm in olfactory response in the antennae controlled by the optic lobe in the cockroach

Cited by 74 publications

References 34 publications

Olfaction in vector-host interactions

Olfaction in vector-host interactions

Circadian regulation of insect olfactory learning

Circadian Organization in Hemimetabolous Insects

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