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Articles 1 - 17 of 17
Full-Text Articles in Life Sciences
Clustering Neural Spike Trains With Transient Responses, John D. Hunter, Jianhong Wu, John Milton
Clustering Neural Spike Trains With Transient Responses, John D. Hunter, Jianhong Wu, John Milton
WM Keck Science Faculty Papers
The detection of transient responses, i.e. nonstationarities, that arise in a varying and small fraction of the total number of neural spike trains recorded from chronically implanted multielectrode grids becomes increasingly difficult as the number of electrodes grows. This paper presents a novel application of an unsupervised neural network for clustering neural spike trains with transient responses. This network is constructed by incorporating projective clustering into an adaptive resonance type neural network (ART) architecture resulting in a PART neural network. Since comparisons are made between inputs and learned patterns using only a subset of the total number of available dimensions, …
Integrating Development And Evolution In Psychology: Looking Back, Moving Forward, David S. Moore
Integrating Development And Evolution In Psychology: Looking Back, Moving Forward, David S. Moore
Pitzer Faculty Publications and Research
This work is the editorial for a special edition of New Ideas in Psychology titled Integrating Development and Evolution in Psychology.
Individuals And Populations: How Biology's Theory And Data Have Interfered With The Integration Of Development And Evolution, David S. Moore
Individuals And Populations: How Biology's Theory And Data Have Interfered With The Integration Of Development And Evolution, David S. Moore
Pitzer Faculty Publications and Research
Research programs in quantitative behavior genetics and evolutionary psychology have contributed to the widespread belief that some psychological characteristics can be “inherited” via genetic mechanisms. In fact, molecular and developmental biologists have concluded that while genetic factors contribute to the development of all of our traits, non-genetic factors always do too, and in ways that make them no less important than genetic factors. This insight demands a reworking of the Modern Evolutionary Synthesis, a theory that defined evolution as a process involving changes in the frequencies of genes in populations, and that envisioned no role for experiential factors now known …
New And Interesting Laboulbeniales From Brazil, Walter Rossi, Ernesto Bergonzo
New And Interesting Laboulbeniales From Brazil, Walter Rossi, Ernesto Bergonzo
Aliso: A Journal of Systematic and Floristic Botany
Two new species of Laboulbeniales are described: Laboulbenia parasyphraeae, parasitic on Parasyphraea sp. (Coleoptera, Chrysomelidae, Alticinae), and L. skelleyi, parasitic on Pselaphacus rubricatus and P. signatus (Coleoptera, Erotylidae). Other recorded species are Chaetomyces pinophili, Chitonomyces aurantiacus, Corethromyces ophitis, Dimorphomyces platensis, Dioicomyces anthici, D. cf. notoxi, Hesperomyces coccinelloides, Hydrophilomyces rhynchophorus, Laboulbenia arnaudii, L. funeralis, L. pachystoma, and L. systenae. Six ‘‘morphospecies’’ of Chitonomyces (C. appendiculatus, C. hyalinus, C. prolongatus, C. simplex, C. uncinatus, and C. cf. zonatus) parasitic on …
A New Species Of Genus Laboulbenia (Laboulbeniales) On Craspedophorus Formosanus (Coleoptera, Carabidae) From Taiwan, With A Note On Laboulbenia Asiatica, Katsuyuki Terada, Meng-Hao Hsu, Wen-Jer Wu
A New Species Of Genus Laboulbenia (Laboulbeniales) On Craspedophorus Formosanus (Coleoptera, Carabidae) From Taiwan, With A Note On Laboulbenia Asiatica, Katsuyuki Terada, Meng-Hao Hsu, Wen-Jer Wu
Aliso: A Journal of Systematic and Floristic Botany
Laboulbenia taiwaniana sp. nov. on Craspedophorus formosanus is described from Taiwan and illustrated with photographs. It is characterized by a long, asymmetrical perithecium with an oblique apex and a pale-colored lower wall, a slender, evenly tapered receptacle with cylindrical cell I and II and trapezoidal cell IV, well developed appendages with black septa concentrated in the basal portion of the appendage system, and especially by black septa on the distal end of cell g. Laboulbenia asiatica, which was described from an Asian carabid---"Casnonia sp."---in 1899 and was illustrated in 1908 by Thaxter, is reviewed and compared …
The Genus Prolixandromyces (Laboulbeniales) In The Old World Prolixandromyces (Laboulbeniales), Alex Weir
The Genus Prolixandromyces (Laboulbeniales) In The Old World Prolixandromyces (Laboulbeniales), Alex Weir
Aliso: A Journal of Systematic and Floristic Botany
Two new species of Prolixandromyces (Laboulbeniales) parasitic on Rhagovelia (Heteroptera: Veliidae) are described and illustrated: Prolixandromyces benjaminii from the Philippine Islands and P. lanceolatus from Africa (Madagascar, Malawi, Nigeria, Sierra Leone, and South Africa) and Asia (Indonesia: Sulawesi, Sumba, Timor; Malaysia: Selangor; and Sri Lanka). In order to accommodate these species the circumscription of Prolixandromyces is emended. The new taxa are compared with the one known species from the Old World, P. triandrus from Spain, and with the five known New World taxa.
New Species Of Cucujomyces (Laboulbeniales) On Chilean Leiodidae, Walter Rossi, Alex Weir
New Species Of Cucujomyces (Laboulbeniales) On Chilean Leiodidae, Walter Rossi, Alex Weir
Aliso: A Journal of Systematic and Floristic Botany
Four new species of Cucujomyces (Laboulbeniales) parasitic on Leiodidae (Coleoptera) from Chile are described and illustrated: Cucujomyces dasypelatis on Dasypelates nebulosus, C. gratiellae on Hydnodietus brunneus, C. neohydnobii on Neohydnobius argentinicus, and C. newtonii on Metahydnobius spp. The new taxa are compared with other known species of Cucujomyces. Morphological variation encountered in one of the new species, C. gratiellae, encompasses attributes of both Cucujomyces and Balazucia, necessitating Balazucia to be placed in synonymy under Cucujomyces. On the basis of this, two new combinations, Cucujomyces bilateralis and C. japonicus, are proposed.
Laboulbeniales On Semiaquatic Heteroptera. A New Species Of Triceromyces (Ascomycota, Laboulbeniales) On Microvelia (Heteroptera, Veliidae) From Spain, Sergio Santamaria
Laboulbeniales On Semiaquatic Heteroptera. A New Species Of Triceromyces (Ascomycota, Laboulbeniales) On Microvelia (Heteroptera, Veliidae) From Spain, Sergio Santamaria
Aliso: A Journal of Systematic and Floristic Botany
A new species of fungal genus Triceromyces (Laboulbeniales) is described: Triceromyces benjaminii. The description is based on several thalli found on the insect host Microvelia pygmaea (Heteroptera, Veliidae), collected in two localities from SE Spain. Characteristics of male and female thalli of this dioecious species are discussed and compared with other dioecious taxa. The characteristics of male thalli require some adjustment in generic limits. This is the first species of Triceromyces known to parasitize a species of Microvelia, a semiaquatic heteropteran genus. The new species is described and illustrated with line drawings and photographs. A table collates information …
Methods Used By Dr. R. K. Benjamin, And Other Mycologists, To Isolate Zygomycetes, Gerald L. Benny
Methods Used By Dr. R. K. Benjamin, And Other Mycologists, To Isolate Zygomycetes, Gerald L. Benny
Aliso: A Journal of Systematic and Floristic Botany
The methods that Dr. Richard K. Benjamin used to isolate Zygomycetes are discussed. These processes involved the following five steps: (1) collection, (2) plating, (3) isolation, (4) culture, and (5) maintenance. Additional methods, materials, and modifications used to isolate Zygomycetes are summarized. The author considers the flattening of the aerial hyphae onto the substrate of the faster- and higher-growing Mucorales for several consecutive days to be the critical step in isolating species of Coemansia, Piptocephalis, Syncephalis, and Dimargaritales. The methods used by other scholars to isolate, culture, and study many taxa in Zygomycetes also are discussed.
The Vascular Flora Of The Owens Peak Eastern Watershed, Southern Sierra Nevada, California, Naomi S. Fraga
The Vascular Flora Of The Owens Peak Eastern Watershed, Southern Sierra Nevada, California, Naomi S. Fraga
Aliso: A Journal of Systematic and Floristic Botany
Owens Peak lies at the southern end of the Sierra Nevada within the Bureau of Land Management’s Owens Peak Wilderness Area in Kern County, California. The study site, ca. 50 square miles, encompasses Owens Peak’s eastern watershed, and ranges in elevation from 800–2600 m (2600–8400 ft). Granite rocks of the Sierra Nevada batholith underlie the study area. The eastern watershed of Owens Peak is botanically diverse, with 64 families, 230 genera, and 440 taxa currently documented. Floristic elements within the study area include the southern Sierra Nevada, Great Basin, and Mojave Desert. The flora previously was poorly documented, as discovered …
Cantua Dendritica (Polemoniaceae), A New Species From Peru, And Two New Cantua Names, J. Mark Porter, L. Alan Prather
Cantua Dendritica (Polemoniaceae), A New Species From Peru, And Two New Cantua Names, J. Mark Porter, L. Alan Prather
Aliso: A Journal of Systematic and Floristic Botany
Cantua dendritica is described as new. This species is apparently restricted to the region around Paucartambo, Department of Cusco, Peru. Related to, and frequently identified as, Cantua flexuosa, this new species differs in its glandular calyx, highly branched trichomes on the margin of the corolla lobes, and its softly herbaceous, glandular pilose leaves. In addition, two new names are proposed in Cantua for the two species of Huthia that have been transferred to Cantua, C. volcanica (formerly Huthia caerulea), and C. mediamnis (formerly H. longiflora).
The Shapley Value Of Phylogenetic Trees, Claus-Jochen Haake, Akemi Kashiwada '05, Francis E. Su
The Shapley Value Of Phylogenetic Trees, Claus-Jochen Haake, Akemi Kashiwada '05, Francis E. Su
All HMC Faculty Publications and Research
Every weighted tree corresponds naturally to a cooperative game that we call a tree game; it assigns to each subset of leaves the sum of the weights of the minimal subtree spanned by those leaves. In the context of phylogenetic trees, the leaves are species and this assignment captures the diversity present in the coalition of species considered. We consider the Shapley value of tree games and suggest a biological interpretation. We determine the linear transformation M that shows the dependence of the Shapley value on the edge weights of the tree, and we also compute a null space …
A Synaptic Basis For Auditory-Vocal Integration In The Songbird, Eric E. Bauer, Melissa J. Coleman, Todd F. Roberts, Arani Roy, Jonathan F. Prather, Richard Mooney
A Synaptic Basis For Auditory-Vocal Integration In The Songbird, Eric E. Bauer, Melissa J. Coleman, Todd F. Roberts, Arani Roy, Jonathan F. Prather, Richard Mooney
WM Keck Science Faculty Papers
Songbirds learn to sing by memorizing a tutor song that they then vocally mimic using auditory feedback. This developmental sequence suggests that brain areas that encode auditory memories communicate with brain areas for learned vocal control. In the songbird, the secondary auditory telencephalic region caudal mesopallium (CM) contains neurons that encode aspects of auditory experience. We investigated whether CM is an important source of auditory input to two sensorimotor structures implicated in singing, the telencephalic song nucleus interface (NIf) and HVC. We used reversible inactivation methods to show that activity in CM is necessary for much of the auditory-evoked activity …
Espousing Interactions And Fielding Reactions: Addressing Laypeople's Beliefs About Genetic Determinism, David S. Moore
Espousing Interactions And Fielding Reactions: Addressing Laypeople's Beliefs About Genetic Determinism, David S. Moore
Pitzer Faculty Publications and Research
Although biologists and philosophers of science generally agree that genes cannot determine the forms of biological and psychological traits, students, journalists, politicians, and other members of the general public nonetheless continue to embrace genetic determinism. This article identifies some of the concerns typically raised by individuals when they first encounter the systems perspective that biologists and philosophers of science now favor over genetic determinism, and uses arguments informed by that perspective to address those concerns. No definitive statements can yet be made about why genetic determinism has proven so resilient in the face of empirical evidence pointing up its deficiencies, …
Estimating Maximum Performance: Effects Of Intraindividual Variation, Stephen C. Adolph, Trevor Pickering '05
Estimating Maximum Performance: Effects Of Intraindividual Variation, Stephen C. Adolph, Trevor Pickering '05
All HMC Faculty Publications and Research
Researchers often estimate the performance capabilities of animals using a small number of trials per individual. This procedure inevitably underestimates maximum performance, but few studies have examined the magnitude of this effect. In this study we explored the effects of intraindividual variation and individual sample size on the estimation of locomotor performance parameters. We measured sprint speed of the lizard Sceloporus occidentalis at two temperatures (20 degrees C and 35 degrees C), obtaining 20 measurements per individual. Speed did not vary temporally, indicating no training or fatigue effects. About 50% of the overall variation in speed at each temperature was …