Does opportunistic testing bias cognitive performance in primates? Learning from drop-outs

Dropouts are a common issue in cognitive tests with non-human primates. One main reason for dropouts is that researchers often face a trade-off between obtaining a sufficiently large sample size and logistic restrictions, such as limited access to testing facilities. The commonly-used opportunistic testing approach deals with this trade-off by only testing those individuals who readily participate and complete the cognitive tasks within a given time frame. All other individuals are excluded from further testing and data analysis. However, it is unknown if this approach merely excludes subjects who are not consistently motivated to participate, or if these dropouts systematically differ in cognitive ability. If the latter holds, the selection bias resulting from opportunistic testing would systematically affect performance scores and thus comparisons between individuals and species. We assessed the potential effects of opportunistic testing on cognitive performance in common marmosets (Callithrix jacchus) and squirrel monkeys (Saimiri sciureus) with a test battery consisting of six cognitive tests: two inhibition tasks (Detour Reaching and A-not-B), one cognitive flexibility task (Reversal Learning), one quantity discrimination task, and two memory tasks. Importantly, we used a full testing approach in which subjects were given as much time as they required to complete each task. For each task, we then compared the performance of subjects who completed the task within the expected number of testing days with those subjects who needed more testing time. We found that the two groups did not differ in task performance, and therefore opportunistic testing would have been justified without risking biased results. If our findings generalise to other species, maximising sample sizes by only testing consistently motivated subjects will be a valid alternative whenever full testing is not feasible.</p

How task format affects cognitive performance:a memory test with two species of New World monkeys

In cognitive tests, animals are often given a choice between two options and obtain a reward if they choose correctly. We investigated whether task format affects subjects' performance in a physical cognition test. In experiment 1, a two-choice memory test, 15 marmosets, Callithrix jacchus, had to remember the location of a food reward over time delays of increasing duration. We predicted that their performance would decline with increasing delay, but this was not found. One possible explanation was that the subjects were not sufficiently motivated to choose correctly when presented with only two options because in each trial they had a 50% chance of being rewarded. In experiment 2, we explored this possibility by testing eight naïve marmosets and seven squirrel monkeys, Saimiri sciureus, with both the traditional two-choice and a new nine-choice version of the memory test that increased the cost of a wrong choice. We found that task format affected the monkeys' performance. When choosing between nine options, both species performed better and their performance declined as delays became longer. Our results suggest that the two-choice format compromises the assessment of physical cognition, at least in memory tests with these New World monkeys, whereas providing more options, which decreases the probability of obtaining a reward when making a random guess, improves both performance and measurement validity of memory. Our findings suggest that two-choice tasks should be used with caution in comparisons within and across species because they are prone to motivational biases

The Camino De Santiago in Twentieth Century Spain

This experience of disillusion led me to investigate further how and why the Camino of today is so different from that of the past, or what I imagined to have existed in the past. I begin my historical analysis in the 1940s, from which time the transformation of the pilgrimage has been quite dramatic. Specifically, the Camino has changed in three distinct manners: (1) the leadership of the Camino has changed hands from the Catholic Church to secular organizations, (2) pilgrims themselves have become more secular, and (3) the touristic aspect of the trail has grown tremendously. In each of these cases, the Camino has been a reflection of Spain\u27s evolving politics, society and economy, respectively

What Predicts the Effectiveness of Foreign Language Pronunciation Instruction?: Investigating the Role of Perception and Other Individual Differences

This study investigated second language (L2) learners’ perception of L2 sounds as an individual difference that predicted their improvement in pronunciation after receiving instruction. Learners were given explicit pronunciation instruction in a series of modules added to their Spanish as a foreign language curriculum and were then tested on their pronunciation accuracy. Their perception of the target sounds was measured with an AX discrimination task. Though the best predictor of pronunciation posttest score was pretest score, perception made a unique and significant contribution. The other factors associated with better pronunciation of some L2 sounds were time spent using Spanish outside the classroom, age, and attitude. The results suggest that instructors should give adequate time for learners to hone their perception of target sounds at the outset of pronunciation instruction, because their initial ability to perceive the target sounds will in part determine how much they learn from such instruction. The results support models of L2 speech acquisition that claim that target-like perception is a precursor to target-like production, in this case in a formal learning context

Language Teaching Research & Language Pedagogy (Review)

This book extends Chaudron’s (1988) review of L2 classroom research to include the studies published in the last thirty years, with the intention of providing technical knowledge to teachers interested in conducting research or using research to inform their teaching. The scope is restricted to studies that investigate the effect of some instructional artifact or procedure on learners’ knowledge of the L2, for the most part within face-to-face classroom interactions. Ellis organizes the research into broad topics of interest and further subdivides them by theoretical or methodological construct. He balances presentation of research in both the cognitive and socio-cultural traditions throughout the volume

Techniques and Principles in Language Teaching, Third Edition (Book Review)

The intended audience of this volume is a “teacher educator” interested in developing a repertoire of language teaching methods. The preface argues that training in methodologies, though certainly not without its critics (e.g. Hinkel, 2006; Rajagopalan, 2007), is useful to language teachers. The authors define the “techniques” in the volume’s title as the methods or actions teachers carry out in the classroom, and the “principles” as the thoughts (beliefs, attitudes, values, and awareness) of teachers that guide those actions. The techniques and principles must be connected and coherent for a language teacher to be successful

Phonetics Instruction Improves Learners\u27 Perception of L2 Sounds

Explicit phonetics instruction can help second language (L2) learners to moderately improve their pronunciation, but less is known about how the instruction affects learners’ perception, even though there is evidence that perception and pronunciation are related. This study provided phonetics instruction to students (n = 46) studying Spanish as a foreign language and measured the resulting change in their perception of eight target phones as compared with a control group (n = 41). Perception was assessed with discrimination tests immediately following instruction and three weeks later. Results indicated that the instruction conferred a small advantage in the delayed posttest and that course level was not a significant factor, suggesting that phonetics instruction was effective for attuning the perception of learners at multiple stages of development

Cross Linguistic Differences in the Immediate Serial Recall of Consonants versus Vowels

The current study investigated native English and native Arabic speakers’ phonological short term memory (PSTM) for sequences of consonants and vowels. PSTM was assessed in immediate serial recall tasks conducted in Arabic and English for both groups. Participants (n=39) heard series of 6 CV syllables and wrote down what they recalled. Native speakers of English recalled the vowel series better than consonant series in English and in Arabic, which was not true of native Arabic speakers. An analysis of variance showed that there was an interaction between first language (L1) and phoneme type. The results are discussed in light of current research on consonant and vowel processing

Multilingual Trends in a Globalized World (Book Review)

This book presents current trends in language education as reflections of and responses to globalization. The intended audience is a diverse group that includes students in linguistics and education, policy makers, educators, and activists. The main thrust of the book is to advocate for bilingual and multilingual education, positioning multilingualism as a resource rather than a proble

Language Learning and Study Abroad: A Critical Reading of the Research (Review)

Kinginger’s interpretation of the research represents an endorsement of the great potential of study abroad, balanced with several limitations and caveats. Kinginger argues that while study abroad generally results in increased proficiency and oral fluency, slightly superior to gains resulting from at-home formal study, one should note the design flaws of many studies such as lack of a true control group as well as reliance on monologic, situation-less tasks to measure language gains, even in the areas of discursive, pragmatic, and sociocultural competencies. Kinginger also notes that opportunities for learning language and cultural through interactions with native speakers can be limited, even stymied, by the unwillingness or inability of interlocutors to manage differences in conversational expectations, cultural norms, and personal identities. One of the main thrusts of the book seems to be challenging the pervasive belief that study abroad is a quick fix or cure all for second language learners. Another thrust is encouraging future researchers to deal with the limitations of the research to date by exploring new geographic regions, pursuing more mixed-method (qualitative with quantitative) approaches, and giving a voice to native participants that is equally as valued as the students’ perspectives