Participants in this group will receive, in addition to standard non-pharmacological measures, a cognitive intervention using a tablet.

Participants will receive the usual non-pharmacological measures, with emphasis on three groups: guidance, cognitive stimulation and visuospatial measures, early active mobility, and recovery of the sleep-wake cycle.

Specific cognitive stimulation intervention using a tablet, administered by the occupational therapist, with the aim of carrying out two interventions each day: one in the morning and one in the afternoon. Each intervention will vary in duration, depending on the person's clinical condition, but will not exceed 20 minutes. Each person will receive the intervention for a period of one week from the diagnosis of delirium, corresponding to five working days. The intervention will focus on three cognitive aspects that are part of the core symptoms of delirium: attention, orientation and visuospatial ability.

The overall severity of delirium and of each of its symptoms will be assessed using the Delirium Rating Scale-Revised-98 (DRS-98) by psychiatrists at the time of admission and after one week, in order to determine changes in its clinical manifestations. The DRS-98 includes phenomenological descriptors to assess the severity levels of each of its 16 items (ranging from 0 to 3, indicating from absence to maximum severity). Scores on the total scale range from 0 to 46 points (items 1 to 16) and from 0 to 39 points on the severity scale (items 1 to 13), indicating from the absence to the maximum severity of symptoms.

The presence and severity of global delirium and of three of its symptoms corresponding to its core domains, assessed using the Delirium Diagnostic Tool-Provisional (DTT-Pro) administered by general practitioners at the time of admission and one week later, in order to determine changes in clinical manifestations. Each item is scored on a Likert scale ranging from zero (maximum severity) to three (no abnormality), with nine being the highest possible score and zero the lowest possible score. The recommended cut-off score is ≤6 for delirium and ≤7 to also identify patients with subsyndromic delirium.

Psychiatrists will assess for the presence of delirium according to the DSM-5 criteria at the time of admission and one week later, in order to determine whether the diagnosis still applies after one week.

We will record whether the individual has been prescribed any of the following types of medication: antipsychotics, benzodiazepines, anticholinergics, opioids and antidepressants. We will note whether these were prescribed on admission, during the follow-up period or at the end of the follow-up period. We will record the generic name and daily dose of each medication, in accordance with the internationally accepted units of measurement for each medication.