title: An ERP N400 study: Semantic processing across modalities in the human brain

authors: Perry, Sarah

subjects: ERP

abstract: Semantic processing in the brain of both language and action has been associated with the N400; an event-related potential (ERP) that is typically present when information has violated one’s semantic expectations. We know that the brain receives and processes information from multiple modalities which means that cross-modal semantic processing is more aligned with how semantic processing is likely to occur in comparison to unimodal semantic processing. The N400 is a consistent effect across cross-modal language-based studies. But we know that the topographical distribution of the N400 does vary between language-based and non-language-based paradigms. Therefore, to investigate cross-modal semantic processing within the action domain, we presented participants with photographs portraying the implementation of common actions. These sequences concluded with a sound that was either congruent or incongruent with the prior action photographs. In our ERP study of 25 participants, with a mean age of 23 years (SD = 10.78 years), we¹ found an N400 effect for incongruent information processing. In addition, our findings showed a delayed N400 effect and a reduced P200 amplitude for incongruent information. These results suggest that cross-modal semantic processing of action sequences requires an increased cognitive workload which is evidenced when semantic processing does not progress as expected. Considered as a whole, these results indicate that cross-modal semantic processing is similar to unimodal processing. Cross-modal information likely requires the involvement of additional cognitive processes that are not present during unimodal paradigms.

text: An ERP N400 study: Semantic processing across modalities in the human brain Semantic processing in the brain of both language and action has been associated with the N400; an event-related potential (ERP) that is typically present when information has violated one’s semantic expectations. We know that the brain receives and processes information from multiple modalities which means that cross-modal semantic processing is more aligned with how semantic processing is likely to occur in comparison to unimodal semantic processing. The N400 is a consistent effect across cross-modal language-based studies. But we know that the topographical distribution of the N400 does vary between language-based and non-language-based paradigms. Therefore, to investigate cross-modal semantic processing within the action domain, we presented participants with photographs portraying the implementation of common actions. These sequences concluded with a sound that was either congruent or incongruent with the prior action photographs. In our ERP study of 25 participants, with a mean age of 23 years (SD = 10.78 years), we¹ found an N400 effect for incongruent information processing. In addition, our findings showed a delayed N400 effect and a reduced P200 amplitude for incongruent information. These results suggest that cross-modal semantic processing of action sequences requires an increased cognitive workload which is evidenced when semantic processing does not progress as expected. Considered as a whole, these results indicate that cross-modal semantic processing is similar to unimodal processing. Cross-modal information likely requires the involvement of additional cognitive processes that are not present during unimodal paradigms.

year: 2023

title: Review: Marine natural products

authors: Blunt, John W.

subjects: green algae

abstract: A review (with 693 references) covering the literature published in 2004 for marine natural products referring to compounds isolated from marine microorganisms and phytoplankton, green, brown and red algae, sponges, coelenterates, bryozoans, molluscs, tunicates and echinoderms.

text: Review: Marine natural products A review (with 693 references) covering the literature published in 2004 for marine natural products referring to compounds isolated from marine microorganisms and phytoplankton, green, brown and red algae, sponges, coelenterates, bryozoans, molluscs, tunicates and echinoderms.

year: 2006

title: Rebel discourses: Colonial violence, Pai Marire resistance and land allocation at Tauranga

authors: Kahotea, Des Tatana

abstract: This thesis is a study of resistance and power in a colonial situation, based on the ethnography of a confiscated-land claim of three hapu who had been Kingitanga supporters and Pai Marire adherents in the 19th century. It draws on archival material and insider ethnography and is arranged into four parts. The first part looks at the relationship between anthropology and colonialism, particularly the role of Sir George Grey, a Governor who used anthropological knowledge to facilitate colonial domination of Maori. Grey instigated the establishment of learned societies which introduced the use of ethnology and anthropology to study Maori. This led to the development of colonial anthropology and its emphasis on salvage anthropology in the late nineteenth century, which in turn gave rise to an intellectual tradition of Maori anthropology. The first proponents of Maori anthropology, Te Rangihiroa and Apirana Ngata, emphasised the role of anthropology for cultural recovery and 'insider' ethnographer. The second part examines the Kingitanga and Pai Marire political and religious expressions of resistance. Political resistance to colonialism was met by legislation by the settler colonial government to punish 'rebellion', a system of collaboration or cultivation of 'loyalty' amongst 'friendly' Maori, and other policies directed at suppressing indigenous expressions of rebel consciousness. This programme had a major bearing on the ongoing existence of these hapu into the twentieth century. Pai Marire was a rebel religious phenomenon that became the object of a campaign of coercion, surveillance, and violence by the settler colonial government. The adherents were subject to policies of exclusion from the redistribution and allocation of confiscated land by local government officials and civil commissioners. The government supported, instead, the land claims of 'friendly' and 'surrendered rebel' chiefs. The third part is hapu ethnography. Key transformations in the nineteenth and twentieth centuries related to changing political and kin alliances for one hapu, Ngati Kahu, while another hapu, Ngati Pango which was involved with Pai Marire, suffered from claims on their traditional lands leading to the undermining of its identity and existence as a socially operating hapu. The fourth part uses historical and ethnographic fragments to consider what Pai Marire meant to its adherents. The colonial construct of Pai Marire and Hauhau was forms of savagery and a mix of Christian syncretism, an image that has little changed from the nineteenth century.

text: Rebel discourses: Colonial violence, Pai Marire resistance and land allocation at Tauranga This thesis is a study of resistance and power in a colonial situation, based on the ethnography of a confiscated-land claim of three hapu who had been Kingitanga supporters and Pai Marire adherents in the 19th century. It draws on archival material and insider ethnography and is arranged into four parts. The first part looks at the relationship between anthropology and colonialism, particularly the role of Sir George Grey, a Governor who used anthropological knowledge to facilitate colonial domination of Maori. Grey instigated the establishment of learned societies which introduced the use of ethnology and anthropology to study Maori. This led to the development of colonial anthropology and its emphasis on salvage anthropology in the late nineteenth century, which in turn gave rise to an intellectual tradition of Maori anthropology. The first proponents of Maori anthropology, Te Rangihiroa and Apirana Ngata, emphasised the role of anthropology for cultural recovery and 'insider' ethnographer. The second part examines the Kingitanga and Pai Marire political and religious expressions of resistance. Political resistance to colonialism was met by legislation by the settler colonial government to punish 'rebellion', a system of collaboration or cultivation of 'loyalty' amongst 'friendly' Maori, and other policies directed at suppressing indigenous expressions of rebel consciousness. This programme had a major bearing on the ongoing existence of these hapu into the twentieth century. Pai Marire was a rebel religious phenomenon that became the object of a campaign of coercion, surveillance, and violence by the settler colonial government. The adherents were subject to policies of exclusion from the redistribution and allocation of confiscated land by local government officials and civil commissioners. The government supported, instead, the land claims of 'friendly' and 'surrendered rebel' chiefs. The third part is hapu ethnography. Key transformations in the nineteenth and twentieth centuries related to changing political and kin alliances for one hapu, Ngati Kahu, while another hapu, Ngati Pango which was involved with Pai Marire, suffered from claims on their traditional lands leading to the undermining of its identity and existence as a socially operating hapu. The fourth part uses historical and ethnographic fragments to consider what Pai Marire meant to its adherents. The colonial construct of Pai Marire and Hauhau was forms of savagery and a mix of Christian syncretism, an image that has little changed from the nineteenth century.

year: 2005