Changes in decisional criteria and bias during perceptual learning

Perceptual learning, roving and the unsupervised bias

Perceptual learning improves perception through training. Perceptual learning improves with most stimulus types but fails when certain stimulus types are mixed during training (roving). This result is surprising because classical supervised and unsupervised neural network models can cope easily with roving conditions. What makes humans so inferior compared to these models? As experimental and c...

Prenatal Perceptual Experience and Postnatal Perceptual Preferences: Evidence for Attentional-Bias in Perceptual Learning

Does perceptual learning in speech reflect changes in phonetic category representation or decision bias?

Recent studies show that perceptual boundaries between phonetic categories are changeable with training (Norris, McQueen, & Cutler, 2003). For example, Kraljic and Samuel (2005) exposed listeners in a lexical decision task to ambiguous /s-integral/ sounds in either s-word contexts (e.g., legacy) or integral-word contexts (e.g., parachute). In a subsequent /s/-/integral/ categorization test, lis...

Recency effects as a window to generalization: separating decisional and perceptual sequential effects in category learning.

Accounts of learning and generalization typically focus on factors related to lasting changes in representation (i.e., long-term memory). The authors present evidence that shorter term effects also play a critical role in determining performance and that these recency effects can be subdivided into perceptual and decisional components. Experimental results based on a probabilistic category stru...

Attentional changes in human perceptual learning.

In two experiments, participants were required to identify a target stimulus by means of same/different judgments. Previously, they had received simultaneous or blocked pre-exposures to the target and a similar stimulus. Participants' ability to judge pre-exposed stimuli as different was better after simultaneous than after blocked pre-exposures. However, the benefit of the simultaneous schedul...