Sensory discrimination has been the quiet underpinning of every episode so far. This one puts it centre stage.

Tracy, Cory, and Michelle work through what sensory discrimination actually is, how it differs from sensory modulation, and why Dr. Ayres was right to place it at the foundation of skilfulness and praxis. Along the way they get into haptic processing, the concept of affordances and action-perception coupling, and why a child who is working hard just to stay upright against gravity simply cannot prioritise sensory detail.

The key idea: sensory discrimination is not just a background process. It is the foundation on which skilfulness is built. And in treatment, the job is not drill or repetition — it is play-based, affectively rich experience that makes sensory detail meaningful enough for the brain to use.

Timestamps:

• 00:00 Welcome and framing the episode
• 01:17 Sensory discrimination as the backbeat to posture and praxis — time to address it directly
• 03:29 Michelle defines sensory discrimination — it's the detail, the fine tuning of input
• 04:36 Tracy: detail for the purpose of what? Sensory processing for skilfulness
• 05:00 The coin in the pocket example — tactile discrimination leading to representational knowledge
• 07:55 Tracy: haptic processing — when touch and vision combine to give us automatic skill
• 10:12 The guitar example — force grading, timing, and the discrimination that underpins it
• 11:25 Tracy: without deep somatosensory integration, you can't maintain core stability while executing fine motor tasks
• 12:33 Michelle: the orchestra metaphor — how the other senses support and amplify each one
• 14:20 Error detection, correction, and the formation of neural pathways through practice
• 16:25 Tracy: the role of clinical observation in discerning where in the process the breakdown occurs
• 19:19 Tracy introduces affordances and action-perception coupling
• 21:54 The bead and the string — why a child can't perceive them as combinable until they have the motor capacity
• 24:56 Tracy: schemas, affordances, and why you can't unlearn riding a bike
• 30:10 Michelle asks Tracy to unpack the difference between perception and cognition
• 30:49 Tracy: perception is the step between pure sensory reception and representational cognition
• 34:30 Tracy: when postural difficulty, modulation challenges, or anxiety make discrimination the second priority
• 35:14 Cory: the vestibular discrimination example — pumping a swing
• 37:00 Tracy: how discriminative vestibular signals organise the postural adaptive response
• 40:31 Michelle: using other sensory systems to spotlight and amplify the target system in treatment
• 42:30 Tracy: affect, mastery drive, and sensory discrimination working together in play
• 44:33 Tracy: Dr. Ayres got it right — sensory discrimination as the base of skilfulness
• 45:15 Michelle: only when a child feels safe in their body can they attend to the detail
• 45:55 Tracy: if your body can't feel detail, it's hard to feel safe — a segue into sensory modulation

Resources mentioned:

Sensory Integration Theory and Practice, 3rd edition — Bundy, A.C. & Lane, S. (2020) Principles of Neural Science, 6th edition — Kandel, E. et al. (2021) Sensory Integration and the Child — Ayres, A.J. & Robbins, J. (2005)

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