CiteULike: Group: Glimcher_Lab - with tag perception

Performance Feedback Drives Caudate Activation in a Phonological Learning Task

Elizabeth Tricomi — 2007-05-16T17:24:38-00:00

J. Cogn. Neurosci., Vol. 18, No. 6. (1 June 2006), pp. 1029-1043.

Adults have difficulty discriminating nonnative phonetic contrasts, but under certain circumstances training can lead to improvement in this ability. Despite the ubiquitous use of performance feedback in training paradigms in this and many other domains, the mechanisms by which feedback affects learning are not well understood. In this event-related functional magnetic resonance imaging study, we examined how performance feedback is processed during perceptual learning. Thirteen Japanese speakers for whom the English phonemes [r] and [l] were nondistinct performed an identification task of the words "road" and "load" that has been shown to be effective in inducing learning only when performance feedback is present. Each subject performed alternating runs of training with and without feedback, followed by performance of a card-guessing task with monetary reward and punishment outcomes. We found that the caudate nucleus was more robustly activated bilaterally when performing the perceptual identification task with feedback than without feedback, and the right caudate nucleus also showed a differential response to positive and negative feedback. Moreover, using a within-subjects design, we found that the caudate nucleus also showed a similar activation pattern to monetary reward and punishment outcomes in the card-guessing task. These results demonstrate that the caudate responds to positive and negative feedback during learning in a manner analogous to its processing of extrinsic affective reinforcers and indicate that this region may be a critical moderator of the influence of feedback on learning. These findings impact our broader understanding of the mechanisms underlying nondeclarative learning and language acquisition.

Blink : The Power of Thinking Without Thinking

Malcolm Gladwell — 2005-03-29T17:16:21-00:00

(11 January 2005)

Blink is about the first two seconds of looking--the decisive glance that knows in an instant. Gladwell, the best-selling author of The Tipping Point, campaigns for snap judgments and mind reading with a gift for translating research into splendid storytelling. Building his case with scenes from a marriage, heart attack triage, speed dating, choking on the golf course, selling cars, and military maneuvers, he persuades readers to think small and focus on the meaning of "thin slices" of behavior. The key is to rely on our "adaptive unconscious"--a 24/7 mental valet--that provides us with instant and sophisticated information to warn of danger, read a stranger, or react to a new idea. Gladwell includes caveats about leaping to conclusions: marketers can manipulate our first impressions, high arousal moments make us "mind blind," focusing on the wrong cue leaves us vulnerable to "the Warren Harding Effect" (i.e., voting for a handsome but hapless president). In a provocative chapter that exposes the "dark side of blink," he illuminates the failure of rapid cognition in the tragic stakeout and murder of Amadou Diallo in the Bronx. He underlines studies about autism, facial reading and cardio uptick to urge training that enhances high-stakes decision-making. In this brilliant, cage-rattling book, one can only wish for a thicker slice of Gladwell's ideas about what Blink Camp might look like. --Barbara Mackoff How do we make decisions--good and bad--and why are some people so much better at it than others? Thats the question Malcolm Gladwell asks and answers in the follow-up to his huge bestseller, The Tipping Point. Utilizing case studies as diverse as speed dating, pop music, and the shooting of Amadou Diallo, Gladwell reveals that what we think of as decisions made in the blink of an eye are much more complicated than assumed. Drawing on cutting-edge neuroscience and psychology, he shows how the difference between good decision-making and bad has nothing to do with how much information we can process quickly, but on the few particular details on which we focus. Leaping boldly from example to example, displaying all of the brilliance that made The Tipping Point a classic, Gladwell reveals how we can become better decision makers--in our homes, our offices, and in everyday life. The result is a book that is surprising and transforming. Never again will you think about thinking the same way.

Sense and the single neuron: probing the physiology of perception.

AJ Parker — 2005-09-04T22:09:17-00:00

Annu Rev Neurosci, Vol. 21 (1998), pp. 227-277.

The newly defined field of cognitive neuroscience attempts to draw together the study of all brain mechanisms that underlie our mental life. Historically, the major sensory pathways have provided the most trustworthy insights into how the brain supports cognitive functions such as perception, attention, and short-term memory. The links between neural activity and perception, in particular, have been studied revealingly in recent decades. Here we review the striking progress in this area, giving particular emphasis to the kinds of neural events that underlie the perceptual judgments of conscious observers.