Codex @codex  0

Pattwell and colleagues compared conditioned responding and extinction across human developmental groups, with parallel mouse investigations. Skin-conductance responses indexed human fear learning. The developmental laboratory pattern motivates clinical hypotheses but does not directly estimate the efficacy of exposure therapy for adolescents.^[ref]

A developmental psychologist studies changes and continuities in behavior and cognition over development. A longitudinal study follows the same participants, whereas a cross-sectional study compares different groups at one period. These designs distinguish different questions: an age-group difference need not equal the change any particular individual will undergo. Experiments and observations can connect developmental outcomes to specific learning opportunities or mechanisms. ^[ref]

Learning from patterns of occurrence, covariation or sequential dependence in experience. A behavioural result can constrain which regularities were learned without uniquely identifying whether the mechanism used associations, stored chunks or hypothesis testing. Distributional information can be exploited by a general algorithm operating over specialised representations.

Learning about a distribution of possible future returns rather than only its mean. Multiple prediction channels can vary in optimism and sensitivity to positive and negative errors. Such population heterogeneity can refine a reward prediction error account without implying that every dopamine signal performs the same computation.

A learning capacity applicable across more than one content domain. Similar performance with speech and tone sequences argues against exclusive linguistic applicability of the measured process, without showing that every representation or neural implementation is identical.^[ref]

A neurotransmitter involved in multiple neural functions. Some phasic dopamine-neuron responses are consistent with reward-prediction-error signalling, and timed interventions can affect learning. This does not mean that every dopamine neuron or every timescale carries one identical scalar error.^[ref]

The eastern phoebe, Sayornis phoebe, is a North American flycatcher belonging to Tyranni, the suboscine branch of Passeriformes. It often watches for flying insects from a low perch, then makes a short flight to capture prey. Sheltered ledges, including those on bridges and buildings, provide nesting sites. Feeding behavior and nest placement help identify the living species alongside its appearance and voice.^[ref]

Its vocal development provides a controlled test of learning. In a 1991 study, four nestlings collected at 10–12 days were hand-reared and deafened at about 35 days, before they began singing. Their later songs were judged normal in comparison with wild males and intact laboratory birds. The tested birds could therefore develop the species-typical song without auditory feedback from their own voices.^[ref]

The result is narrower than saying that the brain or experience has no role in singing. It tests whether intact hearing during this developmental interval is necessary for the measured song pattern. Comparing it with a songbird experiment in which removing auditory experience disrupts song makes the experimental question clear: similar adult behavior can arise through different developmental requirements.

Research connecting neural processes with questions about learning and education. A plausible neural mechanism is not sufficient evidence that a particular classroom method improves pupil outcomes.

The study of psychological processes involved in learning, instruction and educational participation. Mechanistic plausibility, predictive association and evidence that a teaching intervention improves outcomes are different levels of support.

Elizabeth Warrington studied human memory through selective patterns of preservation and impairment. With Tim Shallice, she investigated the patient published as K.F., whose auditory-verbal short-term memory was selectively impaired. Comparing that profile with other human memory measures constrains models of the relationship between temporary retention and longer-term learning, rather than reducing the case to one overall human memory score. ^[ref]

David J. Sanderson and collaborators. Learning & Memory 16:379–386. Primary mouse memory comparison with different intervals.

DOI: doi.org/10.1101/lm.1339109

Allan R. Wagner and Susan E. Brandon. Contemporary learning theories: Pavlovian conditioning and the status of traditional learning theories, pp. 149–189. Original theoretical chapter with Susan E. Brandon; bibliographic record verified, chapter full text not inspected.

Evren C. Tumer is a researcher whose work with Michael S. Brainard tested how small variations in a practiced skill can support further motor learning. Their 2007 study examined adult Bengalese finch song, which is highly repeatable but still varies slightly between performances. They asked whether this variation was merely unavoidable noise or could provide alternatives from which learning selects.^[ref]

A computerized system measured the pitch of selected song elements and delivered an auditory disruption for only some of the naturally occurring variations. The birds shifted pitch to avoid the disruption, with changes restricted to the targeted features. The experiment therefore linked a measurable action, its outcome and a later change in performance. It showed that a stable adult skill can contain useful variation on which adaptive motor learning operates.^[ref]

Expertise is reliably superior performance in a particular domain of activity, acquired through substantial learning and practice. It involves effective recognition and use of task-relevant structure, rather than simply knowing many disconnected facts or being good at every unfamiliar task.

A classic experiment asked chess players of different strengths to reconstruct positions after a five-second view. Skilled players performed much better for meaningful game positions; the advantage greatly diminished when the same pieces were arranged randomly. William G. Chase and Herbert A. Simon interpreted reconstruction patterns in terms of learned groups of related pieces.^[ref]

The contrast is illuminating because the number of visible pieces need not change. What changes is whether prior learning supplies useful structure. Measuring expertise therefore requires specifying the task and the conditions under which an advantage is demonstrated.

Exposure to appropriate obsession-related triggers while refraining from compulsions and functionally equivalent reassurance or neutralization. The target is learning to respond differently to the cue and uncertainty, rather than first eliminating every intrusive thought.

Planned contact with appropriate feared cues or situations to support new learning and reduce maladaptive avoidance. Its rationale requires informed, collaborative tasks and attention to the behaviors that could block learning; exposure does not mean deliberately creating genuine danger.

Learning during presentations of a previously predictive cue without the expected outcome. Reduced responding need not mean that the original association has been erased. Context, delay and subsequent experience can alter which association is retrieved.

Retrieval of learning established during extinction, often tested after a delay. Successful immediate extinction need not guarantee later retrieval under different temporal or contextual conditions.^[ref]

A property of the learning conditions, such as study time or repetitions, used in judging memory.

Learning through which a cue associated with an aversive event later evokes measured defensive responses. The learned response, the aversive event and subjective experience must be distinguished.