Benefits Of Stimulus Exposure: Developmental Learning Independent Of Task Performance

Title

Benefits Of Stimulus Exposure: Developmental Learning Independent Of Task Performance

Creator

Green D B; Ohlemacher J; Rosen M J

Publisher

Frontiers in Neuroscience

Date

2016
2016-06

Description

Perceptual learning (training-induced performance improvement) can be elicited by task-irrelevant stimulus exposure in humans. In contrast, task-irrelevant stimulus exposure in animals typically disrupts perception in juveniles while causing little to no effect in adults. This may be due to the extent of exposure, which is brief in humans while chronic in animals. Here we assessed the effects of short bouts of passive stimulus exposure on learning during development in gerbils, compared with non-passive stimulus exposure (i.e., during testing). We used prepulse inhibition of the acoustic startle response, a method that can be applied at any age, to measure gap detection thresholds across four age groups, spanning development. First, we showed that both gap detection thresholds and gap detection learning across sessions displayed a long developmental trajectory, improving throughout the juvenile period. Additionally, we demonstrated larger within- and across-animal performance variability in younger animals. These results are generally consistent with results in humans, where there are extended developmental trajectories for both the perception of temporally-varying signals, and the effects of perceptual training, as well as increased variability and poorer performance consistency in children. We then chose an age (mid-juveniles) that displayed clear learning over sessions in order to assess effects of brief passive stimulus exposure on this learning. We compared learning in mid-juveniles exposed to either gap detection testing (gaps paired with startles) or equivalent gap exposure without testing (gaps alone) for three sessions. Learning was equivalent in both these groups and better than both naive age-matched animals and controls receiving no gap exposure but only startle testing. Thus, short bouts of exposure to gaps independent of task performance is sufficient to induce learning at this age, and is as effective as gap detection testing.

Subject

acoustic startle response; adolescent; adult; auditory perception; critical period; development; ear muscle-reflex; experience; gap detection; inferior colliculus; learning; maternal separation; Neurosciences & Neurology; perceptual deterioration; prepulse inhibition; primary auditory-cortex; voice onset time

Format

Journal Article or Conference Abstract Publication

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Rights

Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).

Pages

13-13

Volume

10

Citation

Green D B; Ohlemacher J; Rosen M J, “Benefits Of Stimulus Exposure: Developmental Learning Independent Of Task Performance,” NEOMED Bibliography Database, accessed August 5, 2021, https://neomed.omeka.net/items/show/10007.

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