Abstract：
:In older Aplysia, the central nervous system (CNS) (abdominal ganglion) exerts suppressive and facilitatory control over the peripheral nervous system (PNS) which initially mediates the gill withdrawal reflex and its subsequent habituation evoked by tactile stimulation of the siphon. In young animals, both the suppressive and facilitatory CNS control were found to be absent. In older animals, removal of branchial nerve (Br) input to the gill resulted in a significantly reduced reflex latency and, with ctenidial (Ct) and siphon (Sn) nerves intact, a significantly increased reflex amplitude and an inability of the reflex to habituate with repeated siphon stimulation. In young animals, removal of Br had no effect on reflex latency and with Ct and Sn intact, the reflex amplitude latency was not increased and the reflex habituated. Older animals can easily discriminate between different intensity stimuli applied to the siphon as evidenced by differences in reflex amplitude, rates of habituation, and evoked neural activity. On the other hand, young animals cannot discriminate well between different stimulus intensities. The lack of CNS control in young animals was found to be due to incompletely developed neural processes within the abdominal ganglion and not the PNS. The lack of CNS control in young Aplysia results in gill reflex behaviours being less adaptive in light of changing stimulus conditions, but may be of positive survival value in that the young will not habituate as easily. The fact that CNS control is present in older animals strengthens the idea that in any analysis of the underlying neural mechanisms of habituation the entire integrated CNS-PNS must be taken into account.
journal_name
Can J Physiol Pharmacoljournal_title
Canadian journal of physiology and pharmacologyauthors
Lukowiak Kdoi
10.1139/y79-148subject
Has Abstractpub_date
1979-09-01 00:00:00pages
987-97issue
9eissn
0008-4212issn
1205-7541journal_volume
57pub_type
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journal_title：Canadian journal of physiology and pharmacology
pub_type： 杂志文章
doi：10.1139/y94-086
更新日期：1994-06-01 00:00:00
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journal_title：Canadian journal of physiology and pharmacology
pub_type： 杂志文章
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journal_title：Canadian journal of physiology and pharmacology
pub_type： 杂志文章
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更新日期：1985-08-01 00:00:00
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更新日期：1988-08-01 00:00:00
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更新日期：1998-12-01 00:00:00
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doi：10.1139/y76-034
更新日期：1976-06-01 00:00:00
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doi：10.1139/y75-091
更新日期：1975-08-01 00:00:00
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journal_title：Canadian journal of physiology and pharmacology
pub_type： 杂志文章
doi：10.1139/y95-101
更新日期：1995-06-01 00:00:00
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journal_title：Canadian journal of physiology and pharmacology
pub_type： 杂志文章
doi：10.1139/y84-221
更新日期：1984-10-01 00:00:00
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journal_title：Canadian journal of physiology and pharmacology
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doi：10.1139/y95-195
更新日期：1995-09-01 00:00:00
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journal_title：Canadian journal of physiology and pharmacology
pub_type： 杂志文章
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更新日期：1988-04-01 00:00:00
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journal_title：Canadian journal of physiology and pharmacology
pub_type： 杂志文章
doi：10.1139/y84-211
更新日期：1984-10-01 00:00:00
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doi：10.1139/cjpp-2015-0070
更新日期：2016-04-01 00:00:00
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journal_title：Canadian journal of physiology and pharmacology
pub_type： 杂志文章,评审
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更新日期：1986-07-01 00:00:00
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pub_type： 杂志文章
doi：10.1139/y95-005
更新日期：1995-01-01 00:00:00
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pub_type： 杂志文章
doi：10.1139/y77-071
更新日期：1977-06-01 00:00:00
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更新日期：2002-11-01 00:00:00
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pub_type： 杂志文章
doi：10.1139/y07-040
更新日期：2007-05-01 00:00:00
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pub_type： 杂志文章
doi：10.1139/cjpp-75-4-255
更新日期：1997-04-01 00:00:00
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journal_title：Canadian journal of physiology and pharmacology
pub_type： 杂志文章
doi：10.1139/y88-102
更新日期：1988-05-01 00:00:00
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pub_type： 杂志文章
doi：10.1139/y80-016
更新日期：1980-01-01 00:00:00
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journal_title：Canadian journal of physiology and pharmacology
pub_type： 杂志文章
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更新日期：1991-08-01 00:00:00
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pub_type： 杂志文章
doi：10.1139/y91-280
更新日期：1991-12-01 00:00:00
