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	Sensitive periods -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-12)
		During a sensitive period it is very easy for children to acquire certain abilities, such as language, discrimination of sensory stimuli, and mental modeling of the environment (Montessori, 1966, p.
		Once the sensitive period for a particular ability is past, the development of the brain has progressed past the point at which information can be simply absorbed.
		During this period the child is extremely sensitive to vocal sounds and to movements of the vocal apparatus.
	www.absoluteastronomy.com /encyclopedia/s/se/sensitive_periods.htm (1174 words)

	Environmental Influences on Brain Development
		Sensitive periods have been observed to exist in the development of many different animals as well as in humans.
		Bornstein (1989) points out that the study of sensitive periods has in the past often focused on associating an experience with an observed change, which is postulated to be a consequence of that experience.
		The sensitive caregiver's role is to modulate the infant's arousal, which could also follow intense displeasure, fear, or frustration, by calming the infant and restoring her or him to a tolerable emotional state (van der Kolk and Fisler, 1994), free of anxiety.
	www.ipce.info /library_3/files/glaser/glaser_2.htm (2402 words)

	[No title] (Site not responding. Last check: 2007-10-12)
		The sensitive periods are transitory periods in the child's life during which she is prompted by an inner urge to focus her attention on certain elements in her environment.
		During such a period the child is endowed with a special sensitivity which urges him to focus his attention on certain aspects of her environment to the exclusion of others.
		When a sensitive period is at its height, we may compare it to a searchlight coming from within the mind and illuminating certain parts of the environment, leaving the rest in comparative obscurity.
	www.saber.net /~mearth/SensitivePeriods.htm (879 words)

	Complexity Digest - Sensitive Periods In The Development Of The Brain And Behavior
		Sensitive Periods In The Development Of The Brain And Behavior, J.
		When the effect of experience on the brain is particularly strong during a limited period in development, this period is referred to as a sensitive period.
		Such periods allow experience to instruct neural circuits to process or represent information in a way that is adaptive for the individual.
	www.comdig.org /article.php?id_article=18843 (138 words)

	Journal of Cognitive Neuroscience - Sensitive Periods in the Development of the Brain and Behavior - The MIT Press
		A hypothesis is proposed that experience during a sensitive period modifies the architecture of a circuit in fundamental ways, causing certain patterns of connectivity to become highly stable and, therefore, energetically preferred.
		Plasticity that occurs beyond the end of a sensitive period, which is substantial in many circuits, alters connectivity patterns within the architectural constraints established during the sensitive period.
		Preferences in a circuit that result from experience during sensitive periods are illustrated graphically as changes in a ‘‘stability landscape,’’ a metaphor that represents the relative contributions of genetic and experiential influences in shaping the information processing capabilities of a neural circuit.
	mitpress.mit.edu /catalog/item?sid=6B30C3E6-62D7-4FFA-A18E-4CBF239A8703&ttype=6&tid=16484 (287 words)

	A ROLE FOR OVARIAN HORMONES IN
		Historically, studies of the role of endogenous hormones in developmental differentiation of the sexes have suggested that mammalian sexual differentiation is primarily mediated by testicular androgens, and that exposure to androgens in early life leads to a male brain as defined by neuroanatomy and behavior.
		The sensitive period for permanent structural and behavioral ovarian effects does not end by day 10 in rodents, as generally appears to be true in males, but (depending on the system under study) appears to extend quite late in life.
		Sensitive periods for the androgen-induced masculinization of the rat spinal nucleus of the bulbocavernosus.
	www.bbsonline.org /Preprints/OldArchive/bbs.fitch.html (17824 words)

	School Readiness Considered From a Neuro-Cognitive Perspective
		Central to the concept of critical periods was and is the notion that the brain and behavior of specific species of animals can be adversely affected when individuals are deprived of environmental stimulation that is essential for their normal brain-behavioral development during early, often brief, critical periods of life.
		To demonstrate the plasticity of sensitive periods for the development of language in song bird species, Marler offers the example involving young birds that had been deprived of the opportunity to hear the language of their species during the sensitive period for language development.
		Moreover, research must clarify the nature and range of sensitive periods during postnatal development, early childhood, and adolescence when individuals are optimally ready to take advantage of experiences that advance neuro-cognitive development and learning, and to experimentally test ways to overcome the effects of deprivations or other influences during such sensitive periods.
	readyweb.crc.uiuc.edu /library/1994/peterson.html (6657 words)

	[No title]
		Embryological sensitive periods are well illustrated by the often tragic effects of various agents that produce birth defects.
		A critical period for imprinting was noted as early as 1873 by the English naturalist D. Spalding, who noted that chicks would follow his hand about if first exposed to it during their first 3 days of life, but not if first exposure was on the 4th day or later.
		The critical period for emotional bonding may not be only for child imprinting to adult and sibling but also for parent bonding to child.
	core.ecu.edu /psyc/wuenschk/docs00/CriticalPeriods.doc (2472 words)

	Sensory, Emotional and Social Development of the Young Dog by Dr. Joel Dehasse
		A sensitive period is a point in the maturing process when events are susceptible to leaving long-term effects, or a period when learning is easier and knowledge gained is stored in the long-term memory.
		The sensitive period is preceded and followed by periods of lower sensitivity, and the transition is gradual.
		Sensitization (and the often indissociable generalization) is the process that engenders wariness, fear, phobia and anxiety.
	www.nwk9.com /dehasse_pupdev.htm (9358 words)

	Sensitive Periods in the Development of the Brain and Behavior -- Knudsen 16 (8): 1412 -- The Journal of Cognitive ...
		Sensitive Periods in the Development of the Brain and Behavior -- Knudsen 16 (8): 1412 -- The Journal of Cognitive Neuroscience
		Sensitive Periods in the Development of the Brain and Behavior
		during a sensitive period modifies the architecture of a circuit
	jocn.mitpress.org /cgi/content/abstract/16/8/1412 (267 words)

	Page Title
		There are some very sensitive periods in a puppy's life, and these periods are not to be scoffed at or ignored.
		This is usually the period when these precious babies begin to leave home for their new life with their "own families".
		It is a transition time for puppies, if they have been raised with a schedule about feeding, sleeping, playtime, crating and free runs of the area you want them to call "their space", they become happy members of your family.
	www.rhydowen.com /page15.html (1608 words)

	Untitled Document
		At one or more points in the life of an insect larva there are critical periods of hormone sensitivity.
		During the life of a larva there is a period of environmental sensitivity when the summation of specific signals (such as temperature, photoperiod, nutrition, or pheromones) somehow reprogram the central nervous system.
		Hormone sensitive periods were first discovered in the regulation of insect metamorphosis.
	www.biology.duke.edu /nijhout/polyphenismpage2.htm (503 words)

	Learning \| Chapter Outline
		The sensitive period is a developmental stage when there is a greater likelihood of forming an attachment.
		The eventual sexual preference of many birds is established during a sensitive period before the birds are sexually mature.
		Sensitive periods exist for the establishment of food preferences in birds.
	highered.mcgraw-hill.com /sites/0072490462/student_view0/chapter10/chapter_outline.html (1849 words)

	Sensor Introduction To Sensorial-Motor Album (Site not responding. Last check: 2007-10-12)
		The period of life between the ages of three and seven years covers a period of rapid physical development.
		The education of the senses would be begun methodically in infancy, and should continue during the entire period of instruction which is to prepare the individual for life in society.
		The activities enlargement of sensorial sensitivity increase the child's' respect and awareness for the things which are the source of those sense impressions.
	www.ux1.eiu.edu /~cfsjy/mts/sensor/intro.htm (1079 words)

	LA NUEVA CUBA
		During periods of cool, wet, and overcast weather the disease develops and spreads rapidly because of the polycyclic multiplication of the pathogen.
		Following a crop-free period (winter) each year, the tobacco in the U.S. is exposed to asexual, windborne sporanagiospores originating from inoculum sources on commercial winter tobacco and wild Nicotiana species in the tropical zones south of the 30th parallel of latitude.
		They are sensitive to UV light, and when released, exposure to direct sunlight kills most within an hour.
	www.lanuevacuba.com /nuevacuba/notic-04-09-1513.htm (2058 words)

	Sensitive Periods for Visual Calibration of the Auditory Space Map in the Barn Owl Optic Tectum -- Brainard and Knudsen ...
		During the sensitive period, ITD tuning could be alternately shifted in both directions in the tectum of an individual owl.
		Sensitive periods both for adjustments away from normal and for recovery to normal were strikingly extended when owls were
		Knudsen EI (1985) Experience alters spatial tuning of auditory units in the optic tectum during a sensitive period in the barn owl.
	www.jneurosci.org /cgi/content/full/18/10/3929 (10135 words)

	Sensitive periods for the effect of dietary sodium restriction on intact and denervated taste receptor cells -- ...
		Sensitive periods for the effect of dietary sodium restriction on intact and denervated taste receptor cells -- McCluskey and Hill 283 (5): 1275 -- AJP - Regulatory, Integrative and Comparative Physiology
		Sensitive periods for the effect of dietary sodium restriction on intact and denervated taste receptor cells
		Sodium sensitivity exhibited by the Uncut CT was similar to that of controls, whereas a 1-wk delay of sodium restriction failed to induce recovery of normal responses to sodium by the regenerated, Cut CT.
	ajpregu.physiology.org /cgi/content/full/283/5/R1275 (5388 words)

	Developmental Science and the Media: Early Brain Development
		Rather, there are “sensitive” periods for activities such as language and visual development.
		These sensitive periods are broader and more flexible, and it is not clear whether they can serve as “model systems” for other aspects of development.
		The relative influence of genetics and experience in shaping the young brain is complex, and it is unclear what specific experiences are important, and when they must occur, for healthy brain development.
	www.ecs.org /clearinghouse/38/91/3891.htm (515 words)

	Carmel Valley Montessori School - About Montessori
		Montessori observed several sensitive periods in the young child's life: a need for order in the environment, use of the hand, development of walking, development of speech, a fascination with minute things and the details of objects, and a time of social interest.
		Elementary children, who are in an intermediate period, love to memorize and increase their powers of reasoning.
		When these sensitive periods are allowed an outlet through the environment with the guidance of the teachers, the children become what Montessori called "normalized." Meaning that they are in their normal state of being, they are thriving.
	www.bgcsdto.org /aboutmontessori.htm (680 words)

	Brain Changes During Sensitive Periods for Learning (Site not responding. Last check: 2007-10-12)
		To investigate the biological mechanisms that enable learning and memory, I exploit the fact that many behaviors are best learned during discrete developmental periods.
		Such "sensitive" periods reflect a powerful influence of experience on neural and behavioral development, and are characteristic of imprinting, the development of normal sensory function, and human language acquisition.
		To identify cellular mechanisms that mediate plasticity during sensitive periods, I study vocal learning in songbirds.
	www.bcs.rochester.edu /research/k_nordeen_lab.html (165 words)

	Montessori Philosophy
		Also basic to Montessori's philosophy is her discovery of Sensitive Periods in children's development.
		During these periods children seek certain stimuli with immense intensity, to the exclusion of all others.
		It is the responsibility of the teacher to recognize these periods in individual children and put them in touch with the appropriate materials in the classroom environment.
	www.counciloakmontessori.org /philosophy.html (687 words)

	RECENT LITERATURE
		Pairs remain together for long periods, possibly for life; they come to know each other individually and repel newcomers; individual distance does not exist as they are "contact animals." Most of the agonistic behavior is similar to that of other small passerines, but a few species have developed special forms.
		Sci., 60: 1-5.--Preroosting activity in caged Redwings is initiated by inteusity of light from overhead sky with a maximum occurring between 5 and 20 f.c.; entering the roost occurred between 5 and 1 f.c.
		Birds,,52: 281-295.--Results of field work and color banding, over a period of three years in Surrey, support the suggestion (previously based only on museum taxonomy) that the grayish-headed races should be regarded as a distinct species from the yellow-headed races.
	elibrary.unm.edu /sora/Auk/v078n01/p0109-p0121.html (11069 words)

	FAQs
		The sensitive period for acquiring a sense of order is between 2 1/2 to 3 1/2 years of age for the average child, which leads to reading and numbers at age 4 to 5; for precise movement and coordination, 2 1/2 to 4.
		An approach to education which emphasized the potential of the young child (under age five), and which attempts to develop by means of a prepared environment, utilizing specially trained teachers and uniquely designed learning materials and apparatus having an inherent appeal to the pre-school age child.
		She noted that they became happier and self-controlled after a period of time in a Montessori class in which they experienced challenging tasks absorbing their energies and resulting in a sense of achievement.
	www.lakeoswegomontessori.com /faqs.htm (650 words)

	[No title] (Site not responding. Last check: 2007-10-12)
		Part 2: Identification of sensitive periods during incubation of rainbow trout eggs..
		The treatment concentrations used were multiples of the Low Regulatory Priority limit of 500 ?L/L. Embryo sensitivity was assessed by monitoring daily mortality and determining the time interval that the hydrogen peroxide treatment is most toxic.
		During testing of embryo sensitivity, daily percent mortality of rainbow trout eggs increased significantly between days 6 and 10 (78 to 135 Daily Temperature Units ?C) of incubation.
	www.umesc.usgs.gov /aquatic/drug_research/hydrogen_peroxide/hp_toxicity_rainbow_trout_eggs3.txt (306 words)

	All-Season Training
		Essentially, these sensitive periods are windows of opportunity for the optimum development of biomotor capacities and skill acquisition.
		As he explains, “These sensitive periods are periods in human life when the organs and systems that determine a given ability (balance, endurance, speed, or any other ability) are undergoing intensive development.
		With the older, more mature athlete, these periods become optimal training times that are influenced by more than just growth and development factors—the cumulative effect of things like number of years played and number of injuries.
	www.momentummedia.com /articles/tc/tc1005/training.htm (2451 words)

	Sensitive Periods Part Two (Site not responding. Last check: 2007-10-12)
		The sensitive period for order reveals itself when the child reaches his second year and it lasts for about two years.
		First, for physical orientation to find his way around, and later in mental orientation and for classification, this sensitive period establishes within him the rhythm he needs in order to fulfill his tendency for order.
		As the child passes into his 4th and 5th year, the sensitive period for order becomes calmer and his reactions toward disorder are not as violent and disturbing as before.
	www.saber.net /~mearth/SensitivePeriods2.htm (613 words)

	Maria Montessori
		Aside from a new pedagogy, among the premier contributions to educational thought by Montessori are:
		delineation of a scale of sensitive periods of development Sensitive Periods, which provide a focus for class work that is appropriate and uniquely stimulating and motivating to the child (including sensitive periods for language development, sensorial experimentation and refinement, and various levels of social interation)
		The phenomenon is characterized by the young child's capacity for repetition of activities within sensitive period categories (Example: exhaustive babbling as language practice leading to language competence).
	www.brainyencyclopedia.com /encyclopedia/m/ma/maria_montessori.html (518 words)

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